J-35 Draken build thread
12-28-2011, 10:05 AM
#101
Thread Starter
RE: The new Saab J-35 Draken arrived!!!
Hello Eric,
Gald to hear of your interest in the mighty Draken!
The large jet is currently undergoing its annual overhaul in the shop and will again be ready to cause much excitement this coming season.
The original purchase was thru a now defunct RCI distribution of Airworld models on the west coast. They are no longer in business, however, you may still obtain the kit directly
from Mr Peter Liebetrau in Germany. He, along with Manfred Eberhard were the two men originally in colaboration during the proto-testing of the large jet. I have in my shop some e-mail contacts
for Peter if you like, It would also be a pleasure to chat with you regarding the J-35 Draken if you choose to obtain a kit. The jet has been in service since 2008, and has always managed a respectable placing in my hands at the various contest entered.
I have made some mods to accomodate lighting, the afterburner, and most importantly, the braking parachute system designed by Dan at www.Details4scale.com.
I will PM your mail box with my numbers, perhaps you can call me during this comming weekend?
Take care for now Eric, Happy New year!
Frank
Gald to hear of your interest in the mighty Draken!
The large jet is currently undergoing its annual overhaul in the shop and will again be ready to cause much excitement this coming season.
The original purchase was thru a now defunct RCI distribution of Airworld models on the west coast. They are no longer in business, however, you may still obtain the kit directly
from Mr Peter Liebetrau in Germany. He, along with Manfred Eberhard were the two men originally in colaboration during the proto-testing of the large jet. I have in my shop some e-mail contacts
for Peter if you like, It would also be a pleasure to chat with you regarding the J-35 Draken if you choose to obtain a kit. The jet has been in service since 2008, and has always managed a respectable placing in my hands at the various contest entered.
I have made some mods to accomodate lighting, the afterburner, and most importantly, the braking parachute system designed by Dan at www.Details4scale.com.
I will PM your mail box with my numbers, perhaps you can call me during this comming weekend?
Take care for now Eric, Happy New year!
Frank
11-06-2013, 01:54 PM
#102
My Feedback: (1)
This large Draken RC jet is sold here in Europe by an Austrian company, Modellsport Schweighofer.
They have made a nice video I happened to see today, it is an impressive model:
https://www.youtube.com/watch?v=xKX3bWhnLgY
Kit:
http://www.der-schweighofer.at/en/gr...ab_j-35_draken
The landing gear:
https://www.youtube.com/watch?v=VV4sLRjRhvk
Tail gear:
https://www.youtube.com/watch?v=XHC4mBwnShg
Another build thread in Denmark (in Danish but nice photos):
http://www.jetdanmark.dk/e107_plugin...ic.php?14596.0
(in lower left corner you can select other pages 1-5, "Gå til side"=Go to page)
The manufacturer of this J-35 Draken is MIBO according to the Danish buildthread above.
They have made a nice video I happened to see today, it is an impressive model:
https://www.youtube.com/watch?v=xKX3bWhnLgY
Kit:
http://www.der-schweighofer.at/en/gr...ab_j-35_draken
The landing gear:
https://www.youtube.com/watch?v=VV4sLRjRhvk
Tail gear:
https://www.youtube.com/watch?v=XHC4mBwnShg
Another build thread in Denmark (in Danish but nice photos):
http://www.jetdanmark.dk/e107_plugin...ic.php?14596.0
(in lower left corner you can select other pages 1-5, "Gå til side"=Go to page)
The manufacturer of this J-35 Draken is MIBO according to the Danish buildthread above.
Last edited by bem; 11-06-2013 at 11:45 PM.
11-09-2013, 01:33 AM
#104
My Feedback: (1)
erh7771,
You can see the shipping box seize in the very first post in this thread. The box is almost like a small playhouse for kids. The Draken fuselage is huge and each wing halves is deattachable but You can imagine that shipping cost for the huge box would be rather high from Europe/Austria to US.
Have a look at another buildthread (in Germany) here - just use the link in Google translator to get all translated from German to English:
http://www.rc-network.de/forum/showt...t-Schweighofer
But just e-mail Modellsport Schweighofer with Your postal address at [email protected] and I'm sure they can give an estimate of shipping cost to US.
By the way, it is still one full scale Draken flying here in Sweden (I do not think they flew this year but in 2012 they flew with it):
https://www.youtube.com/watch?v=4b_JkQ21u7s
/Bo
You can see the shipping box seize in the very first post in this thread. The box is almost like a small playhouse for kids. The Draken fuselage is huge and each wing halves is deattachable but You can imagine that shipping cost for the huge box would be rather high from Europe/Austria to US.
Have a look at another buildthread (in Germany) here - just use the link in Google translator to get all translated from German to English:
http://www.rc-network.de/forum/showt...t-Schweighofer
But just e-mail Modellsport Schweighofer with Your postal address at [email protected] and I'm sure they can give an estimate of shipping cost to US.
By the way, it is still one full scale Draken flying here in Sweden (I do not think they flew this year but in 2012 they flew with it):
https://www.youtube.com/watch?v=4b_JkQ21u7s
/Bo
Last edited by bem; 11-09-2013 at 03:15 AM.
02-26-2018, 10:15 AM
#105
Hello Frank, I see that you are still flying the Draken from recent pictures of it in the March 2018 AMA magazine, the pics are from 12 O'clock High last October. I wish we could see it at Best In The West!
Anyway, I recently took delivery of the Airworld kit and found this build thread, thank you! Could you bring us up to date on any lessons learned? I am very interested to know where your CG ended up if different from what you posted so many years ago. Also what power output you think would be best for this jet. I am also interested in surface throws and how the ailerons and flaps work together. I see in the video referenced in this thread that you took off without flaps and on landing it looked liked the ailerons and flaps were working together.
The speedbrakes look awesome but of course they are a lot of work, did you ever land without them? I wonder how important they are for landing drag devices.
Thank you.
Anyway, I recently took delivery of the Airworld kit and found this build thread, thank you! Could you bring us up to date on any lessons learned? I am very interested to know where your CG ended up if different from what you posted so many years ago. Also what power output you think would be best for this jet. I am also interested in surface throws and how the ailerons and flaps work together. I see in the video referenced in this thread that you took off without flaps and on landing it looked liked the ailerons and flaps were working together.
The speedbrakes look awesome but of course they are a lot of work, did you ever land without them? I wonder how important they are for landing drag devices.
Thank you.
01-21-2021, 06:16 PM
#106
Thread Starter
Hello Folks,
Well, Its been 14 years since I started this thread with the initial build!
I am delighted to say that the jet has been a real joy to showcase.
While I have had my share of the routine maintenance hurdles, we have managed to keep the aircraft in the fight season after season.
I am now on my third complete turbine overhaul, and second complete fuel system overhaul, and pleased that all is well in that regard.
While recovering from a recent medical procedure, my Neurosurgeons strongly recommended walking, subtle flexing around the mid-section, and no lifting over 10lbs for now.
So, it would seem that standing around and tinkering in my shop would adhere to these exact medical orders!
The "D" check began with removing many zip-ties containing bundles of wires under the cockpit floor, and the nose electronics, and checking for chaffing...None found!
The aft-fuselage was separated so as to reveal the speed brake pneumatic manifold and to service with thin-lube type O-ring rejuvenator.
Turbine mount, and all peripherals checked and in order.
Airframe tail-wheel and door cylinders thin-lubed and inspected.
The turbine solenoids were swapped as I have done every two years. The gas solenoid swapped for the fuel and vice versa. So far it as kept everything lubed and performing well with this practice.
I have alternated between two exhaust pipes every two years, and discovered the installed one to be missing a mounting/bell mouth tab screw, and one side of the actual plywood pipe mount to have broken free. The thing was being held on by '1' screw...Whew, glad to have caught that!
There was evidence of time/heat damage to airlines, and replaced. Secured, and heat shielded once again prior to re-assembly.
The original "Dan Gill" 'Auto-chute' system was zeroed out, and re-configured so as to begin fresh. Wheel hall-effect sensor may have to be replaced, There is evidence of tire side-wall rub on the sensor face, further testing to follow.
14 years of outdoor exposure, the occasional caught in a rain moments, and the combination of transport, and hangar rash had taken its toll. The paint, and nomenclature had seen better days.
I actually had what looked like oxidized paint blemishes throughout the fuselage, so It was given a complete rubbing-compound rejuvenation. In the end many decals were replaced with the assist from the guys at Tailormade, Germany.
The most notable face-lift is the dead accurate paint-mask provided by Tailormade for the upper # 13. I finally have the correct Austrian numeric outline for my jet! These were then rubbed down with 1500 wet sanding to flatten the gloss down a few notches.
The numbers 13 with a flatter finish, and the assorted new/restored nomenclature.
The following two photo's display the surface paint blemishes that had developed over the years, and corrective results.
You can see it around the NACA duct on the right side.
Here is the before:
A
nd after paint compound application:
Example of the nomenclature wear. All have now been replaced, or restored and looking great. More pic's to come soon of the completed restoration.
In the coming weeks as my health improves post-surgery, I should be able to turn the jet over in its cradle to have a good look at the landing gear, steering cables, and associated components on the belly of the jet.
This jet with its complex pneumatics (14 air cylinders) has survived many seasons of aggressive flying. To say it requires a heavy maintenance discipline would be an understatement! Man, I am always on it after a few days of flying work-ups!
Admittingly, every minute has been worth it.
Talk to you guys in a few weeks with more overhauling of the Draken.
Take care,
Franko
Well, Its been 14 years since I started this thread with the initial build!
I am delighted to say that the jet has been a real joy to showcase.
While I have had my share of the routine maintenance hurdles, we have managed to keep the aircraft in the fight season after season.
I am now on my third complete turbine overhaul, and second complete fuel system overhaul, and pleased that all is well in that regard.
While recovering from a recent medical procedure, my Neurosurgeons strongly recommended walking, subtle flexing around the mid-section, and no lifting over 10lbs for now.
So, it would seem that standing around and tinkering in my shop would adhere to these exact medical orders!
The "D" check began with removing many zip-ties containing bundles of wires under the cockpit floor, and the nose electronics, and checking for chaffing...None found!
The aft-fuselage was separated so as to reveal the speed brake pneumatic manifold and to service with thin-lube type O-ring rejuvenator.
Turbine mount, and all peripherals checked and in order.
Airframe tail-wheel and door cylinders thin-lubed and inspected.
The turbine solenoids were swapped as I have done every two years. The gas solenoid swapped for the fuel and vice versa. So far it as kept everything lubed and performing well with this practice.
I have alternated between two exhaust pipes every two years, and discovered the installed one to be missing a mounting/bell mouth tab screw, and one side of the actual plywood pipe mount to have broken free. The thing was being held on by '1' screw...Whew, glad to have caught that!
There was evidence of time/heat damage to airlines, and replaced. Secured, and heat shielded once again prior to re-assembly.
The original "Dan Gill" 'Auto-chute' system was zeroed out, and re-configured so as to begin fresh. Wheel hall-effect sensor may have to be replaced, There is evidence of tire side-wall rub on the sensor face, further testing to follow.
14 years of outdoor exposure, the occasional caught in a rain moments, and the combination of transport, and hangar rash had taken its toll. The paint, and nomenclature had seen better days.
I actually had what looked like oxidized paint blemishes throughout the fuselage, so It was given a complete rubbing-compound rejuvenation. In the end many decals were replaced with the assist from the guys at Tailormade, Germany.
The most notable face-lift is the dead accurate paint-mask provided by Tailormade for the upper # 13. I finally have the correct Austrian numeric outline for my jet! These were then rubbed down with 1500 wet sanding to flatten the gloss down a few notches.
The numbers 13 with a flatter finish, and the assorted new/restored nomenclature.
The following two photo's display the surface paint blemishes that had developed over the years, and corrective results.
You can see it around the NACA duct on the right side.
Here is the before:
A
nd after paint compound application:
Example of the nomenclature wear. All have now been replaced, or restored and looking great. More pic's to come soon of the completed restoration.
In the coming weeks as my health improves post-surgery, I should be able to turn the jet over in its cradle to have a good look at the landing gear, steering cables, and associated components on the belly of the jet.
This jet with its complex pneumatics (14 air cylinders) has survived many seasons of aggressive flying. To say it requires a heavy maintenance discipline would be an understatement! Man, I am always on it after a few days of flying work-ups!
Admittingly, every minute has been worth it.
Talk to you guys in a few weeks with more overhauling of the Draken.
Take care,
Franko
01-21-2021, 09:25 PM
#107
Looking good Frank! Always good to see more of and hear more about your magnificent bird. Mine still sits awaiting my attention but I did finally get the cockpit for it after years of waiting so that excuse is gone, and I am recently retired so I expect to have time to build, maybe after the ski season ends!
01-23-2021, 04:42 AM
#109
Thread Starter
Hi Gary,
Thanks, Its "the' place for mental decompression in my books!
Well... our golf course runs a close second place though... that will have to wait post surgery. But I sure do like to tinker with my fleet to ensure a state of readiness to fly them.
I have high 9.6 foot ceilings , and gonna have to consider an easy use electrical/manual type hoist to store aircraft above me.
I'll inquire with folks here when ready to do that as my table top space is becoming increasingly occupied by airframes.
Next time you have business in Summerville with the truck, give me shout. I'll have my people, talk to your people, and arrange a
coffee session tour. Hahahah.
Take care brother, talk soon.
Frank
Thanks, Its "the' place for mental decompression in my books!
Well... our golf course runs a close second place though... that will have to wait post surgery. But I sure do like to tinker with my fleet to ensure a state of readiness to fly them.
I have high 9.6 foot ceilings , and gonna have to consider an easy use electrical/manual type hoist to store aircraft above me.
I'll inquire with folks here when ready to do that as my table top space is becoming increasingly occupied by airframes.
Next time you have business in Summerville with the truck, give me shout. I'll have my people, talk to your people, and arrange a
coffee session tour. Hahahah.
Take care brother, talk soon.
Frank
01-24-2021, 09:50 AM
#110
Thread Starter
Hello folks,
The 14 year overhaul continued at a snails pace over the last few days, however, I am delighted at the progress.
Perhaps you've wondered what I used for the paint blemishes, and overall restoration?
This is the widely available product from "McGuire's" It's called "Scratch X - 2.0"
Have used it on my vehicles this season with excellent results, had to give it try, and glad that I did.
I used a cotton rag, and limited the work to a single panel, then the next and so on.
Another terry-cloth type towel to remove with while considering the airflow over the panel while in flight. This helps to keep a scale appearance on the surface.
Any remaining residual solvent is then carefully removed with just a dampened paper towel, again staying true to airflow considerations.
Here is the entire assembled airframe. The restored semi-flat finish turned out well in my opinion.
My reference documentation on the Austrian fleet #13 shows partial areas of gloss/semi-gloss/flat paint throughout.
I have tried to replicate that when first assembled back in 2007.
The following two photo's represent the finished product along with the new, and restored nomenclature on the upper fuselage.
Some retouching of the weathering had to be completed were new decals were installed.
Lastly, the upper newly sprayed number 13 had to be buffed down to a dull finish to resemble the scale documentation I have for the real #13 Austrian Draken.
While I had much of the airframe internal electrical harnesses exposed, I decided to fully inspect/replace the Nav-lights, and the landing lights for faults.
Only one failure here over the years, that was the under fuselage red beacon, and I replaced it.
The tail-wheel assembly and door area inspected and lubed for another several seasons.
This Draken now appears to be ready for a High-CAP sortie over the Nordic Block territories!
And of course, The Afterburner lights...
Finally for today, I am showing the before, and after rejuvenation of the engine inlet (Warning/Danger) nomenclature.
You can see 14 years of ultra-violet exposure has caused the labeling and warning bands to fade.
I was able to restore these with very carefully applied "Sharpie" highlighter markers! Careful here as 'not' to use the neon-green and only use the yellow type.
The printing on the marker says permanent, guess we'll have to see in due time.
The original Drogue-chute installed on the Draken was the Auto-chute system offered by Dan at Scale4Detail when he was still active.
It is the unit designed for the large BVM F4 airframe that was in service back then.
With minimal modification, Dan was able to assist with my needs for the Draken.
During this overhaul, I have re-programed the system and all works well "via" the test remote switch supplied with the system. All has been correctly sequenced and validated thru the test switch.
With the airframe chocked and right wheel elevated to simulate a tire RPM speed based deployment...I get no chute system deployment/activation?
I've carefully inspected the hall-effect sensor spacing to the imbedded tire magnets, they are exactly as specified, 1/16-3/32 max!
The sensor itself inspected with magnified view and is as new condition noted at the sensor tip..ie no tire rub over the years.
I'm open to any ideas you guys can offer. While not a functional game changer in displaying the jet, it sure would be nice to have this system functional.
When i am capable, I will report on my bottom fuselage findings.
Take care for now,
Franko
The 14 year overhaul continued at a snails pace over the last few days, however, I am delighted at the progress.
Perhaps you've wondered what I used for the paint blemishes, and overall restoration?
This is the widely available product from "McGuire's" It's called "Scratch X - 2.0"
Have used it on my vehicles this season with excellent results, had to give it try, and glad that I did.
I used a cotton rag, and limited the work to a single panel, then the next and so on.
Another terry-cloth type towel to remove with while considering the airflow over the panel while in flight. This helps to keep a scale appearance on the surface.
Any remaining residual solvent is then carefully removed with just a dampened paper towel, again staying true to airflow considerations.
Here is the entire assembled airframe. The restored semi-flat finish turned out well in my opinion.
My reference documentation on the Austrian fleet #13 shows partial areas of gloss/semi-gloss/flat paint throughout.
I have tried to replicate that when first assembled back in 2007.
The following two photo's represent the finished product along with the new, and restored nomenclature on the upper fuselage.
Some retouching of the weathering had to be completed were new decals were installed.
Lastly, the upper newly sprayed number 13 had to be buffed down to a dull finish to resemble the scale documentation I have for the real #13 Austrian Draken.
While I had much of the airframe internal electrical harnesses exposed, I decided to fully inspect/replace the Nav-lights, and the landing lights for faults.
Only one failure here over the years, that was the under fuselage red beacon, and I replaced it.
The tail-wheel assembly and door area inspected and lubed for another several seasons.
This Draken now appears to be ready for a High-CAP sortie over the Nordic Block territories!
And of course, The Afterburner lights...
Finally for today, I am showing the before, and after rejuvenation of the engine inlet (Warning/Danger) nomenclature.
You can see 14 years of ultra-violet exposure has caused the labeling and warning bands to fade.
I was able to restore these with very carefully applied "Sharpie" highlighter markers! Careful here as 'not' to use the neon-green and only use the yellow type.
The printing on the marker says permanent, guess we'll have to see in due time.
The original Drogue-chute installed on the Draken was the Auto-chute system offered by Dan at Scale4Detail when he was still active.
It is the unit designed for the large BVM F4 airframe that was in service back then.
With minimal modification, Dan was able to assist with my needs for the Draken.
During this overhaul, I have re-programed the system and all works well "via" the test remote switch supplied with the system. All has been correctly sequenced and validated thru the test switch.
With the airframe chocked and right wheel elevated to simulate a tire RPM speed based deployment...I get no chute system deployment/activation?
I've carefully inspected the hall-effect sensor spacing to the imbedded tire magnets, they are exactly as specified, 1/16-3/32 max!
The sensor itself inspected with magnified view and is as new condition noted at the sensor tip..ie no tire rub over the years.
I'm open to any ideas you guys can offer. While not a functional game changer in displaying the jet, it sure would be nice to have this system functional.
When i am capable, I will report on my bottom fuselage findings.
Take care for now,
Franko
Last edited by Frank Alvarez; 01-24-2021 at 11:32 AM.
01-25-2021, 12:41 PM
#111
wow as a lover of Sweden seeing this bird fills me with joy. I also suppose he is a good flier
we also hope for a long time.
p.s really very nice
[img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAQAAAA ngNWGAAAA/0lEQVR4AYXNMSiEcRyA4cfmGHQbCZIipkuxnJgMStlMNmeyD2d wmc8+sZgxYJd9ErIZFHUyYYD7fkr6l4/rnvmtl7+KitrqV/fq2Y5eLY3Z9S48eRLe7BmVZ9qhTLhQ0algzZWQOVKSsCF8OjAn wbxDTWFDUhPK/jMr1H6HE/IqRky2DyvCefuwItwZzodVoYRiLqMkVCXrwpJ9twZ+sgfDYEFY l8wIWxZ9uFf7zkallxlJh4YrLGsKjZRx7VGHhLqwgFUN45DGdb 8MeXGpgB4ABZdeDcpZEY51A+hyLKz4S1W4MQWm3AibWtgWmk6d yISa1pSdyWTOlLXVp0+eL9D/ZPfBTNanAAAAAElFTkSuQmCC[/img]
we also hope for a long time.
p.s really very nice
[img]data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAQAAAA ngNWGAAAA/0lEQVR4AYXNMSiEcRyA4cfmGHQbCZIipkuxnJgMStlMNmeyD2d wmc8+sZgxYJd9ErIZFHUyYYD7fkr6l4/rnvmtl7+KitrqV/fq2Y5eLY3Z9S48eRLe7BmVZ9qhTLhQ0algzZWQOVKSsCF8OjAn wbxDTWFDUhPK/jMr1H6HE/IqRky2DyvCefuwItwZzodVoYRiLqMkVCXrwpJ9twZ+sgfDYEFY l8wIWxZ9uFf7zkallxlJh4YrLGsKjZRx7VGHhLqwgFUN45DGdb 8MeXGpgB4ABZdeDcpZEY51A+hyLKz4S1W4MQWm3AibWtgWmk6d yISa1pSdyWTOlLXVp0+eL9D/ZPfBTNanAAAAAElFTkSuQmCC[/img]
01-25-2021, 04:43 PM
#112
Thread Starter
Hello T-6,
Thank you for the kind comments.
My Draken has been in service for 14 years, and is as you said, a great flying jet!
I look forward to continue to practice my display when healthy enough to do so.
And with much care, enjoy many more years of service from this wonderful and unique airframe.
Take care, be well,
Frank
Thank you for the kind comments.
My Draken has been in service for 14 years, and is as you said, a great flying jet!
I look forward to continue to practice my display when healthy enough to do so.
And with much care, enjoy many more years of service from this wonderful and unique airframe.
Take care, be well,
Frank
01-25-2021, 04:44 PM
#113
Your jet is beautiful Frank. Very nice.
Guys Roger is building a smaller version which can be seen over on rc groups. He has the molds that were used to make the Draken in the movie Firebirds with Nicholas Cage. It can be built with EDF or 80 size turbine. Two have been completed using edf and one is going to be built with turbine. These are for sale for $1400. with retracts if anyone is interested. https://www.rcgroups.com/forums/show...b-Draken-build
Guys Roger is building a smaller version which can be seen over on rc groups. He has the molds that were used to make the Draken in the movie Firebirds with Nicholas Cage. It can be built with EDF or 80 size turbine. Two have been completed using edf and one is going to be built with turbine. These are for sale for $1400. with retracts if anyone is interested. https://www.rcgroups.com/forums/show...b-Draken-build
Last edited by MarkF; 01-25-2021 at 05:11 PM.
The following users liked this post:
yeahbaby (01-25-2021)
01-27-2021, 05:12 AM
#115
Thread Starter
So envious !
I have about a year and half till I retire from the airline.
While not by choice, this small hiatus from the line is rather welcoming!
Tentatively returning March 1st? But that will be determined how my back is shaping up post surgery and physical therapy, hell I haven't even been
to my first post opp visit with my neurosurgeon. Everything is still rather fresh along that 5 inch stitched area on the spine.
If I don't get the results I seek with this fourth, and final procedure, I'll seek an early out as well.
Then be able to play full time with you guys.....Can't wait!
I have about a year and half till I retire from the airline.
While not by choice, this small hiatus from the line is rather welcoming!
Tentatively returning March 1st? But that will be determined how my back is shaping up post surgery and physical therapy, hell I haven't even been
to my first post opp visit with my neurosurgeon. Everything is still rather fresh along that 5 inch stitched area on the spine.
If I don't get the results I seek with this fourth, and final procedure, I'll seek an early out as well.
Then be able to play full time with you guys.....Can't wait!
01-27-2021, 05:38 AM
#116
Thread Starter
During my task with the Draken overhaul, I was 'rudely' interrupted by a FED-Ex delivery guy...
Had to stop everything I was doing to inspect a new arrival and sign for this.....can you imagine my angst?
Been a scale nut most of my R/C life. This is a first for me, I've never owned a sport jet!
My latest 'go-fast' ...
I'll start this in February. Whoohoo!
Had to stop everything I was doing to inspect a new arrival and sign for this.....can you imagine my angst?
Been a scale nut most of my R/C life. This is a first for me, I've never owned a sport jet!
My latest 'go-fast' ...
I'll start this in February. Whoohoo!
The following users liked this post:
sewbusy (01-27-2021)
01-27-2021, 07:27 AM
#118
Thread Starter
Hi Wayne,
Looking forward to it man!
Did your gang stay in Boone last time out?
My spouse will be joining me for this one, and we'd like to get into some of the nice eateries in town.
Any suggestions?
Stay safe,
Franko
Looking forward to it man!
Did your gang stay in Boone last time out?
My spouse will be joining me for this one, and we'd like to get into some of the nice eateries in town.
Any suggestions?
Stay safe,
Franko
01-27-2021, 08:33 AM
#120
01-27-2021, 08:41 AM
#121
Thread Starter
OK,
Now back to the Draken ...
In a previous post, I mentioned how I was pulling my hair out regarding the continued failure of the 'Auto-Chute system.
The jet was blocked up off of the wheel sensor side to begin further troubleshooting.
Then the removal and detailed front/back inspection of the actual Hall Effect sensor...and its related wiring.
One of Kerry's strongly recommended ideas, was that the H/E sensor was protected by a G-10 mount with a peep hole enabling the sensor a clear view to the magnetic field pulses.
This provided great tire side wall protection for those 'other-than-normal' landings and side loads during take-off, and landings.
I spent the better half of two days over the weekend troubleshooting with negative results. Eventually I had to pull away and drink heavily to consider my next move.
A dear and long time friend and I were playing catch up on the phone when I shared my dilemma with him. I asked him how to troubleshoot a 'Hall-Effect' sensor, cause I'm a dummy. My friend, Kerry Sterner, (aircraft designer extraordinaire), and brilliant fellow, asked a few in response to mine.
You see, Kerry was instrumental during the initial build 14 years ago! He resolved numerous hurdles and engineering translations as the Draken originated in Germany. The kit was typical of the German philosophy with regard to model kits....place turbine here, install radio equipment in this general area, install fuel system(no fuel tanks provided) seek your own set-up.
I constructed a mock wheel out of cardboard, and this would allow me to test both negative, and positive polarity on the sensor. this carboard was simply attached to a variable speed drill and simulated tire RPM.
Test # 1, negative magnetic pulses failed.
Test # 2, positive magnetic pulses triggered the system! I was now on to something!
My take-aways from the flurry of weekend activity...
1-Always, always check and confirm the uniform application of magnetic polarity for the hall effect sensor! No where in the printed guidance was this critical point stated. I've just been occasionally lucky
over the years when replacing lost magnets in the tire side-walls. And the currently installed tire magnets were found to be completely wrong! Two in sequence were negative, with the following two positive.
No wonder now why I had a lousy two seasons ... the sensor would read two pulses, then discard the next two, and repeat this during the landing roll-out and fail.
Over the years of operating this jet, I have had great seasons of chute deployment, then several back to back with no chute...and usually after replacing lost wheel magnets.. who would have 'thunk' it?...DUUUHHHH!
2-Routinly dig into and under the installed electronics to "verify" the wheel-speed RPM sensor is properly seated into the microprocessor! Duuuhhh #2 !
The RPM sensor pig-tail was found nearly completely out of its seat on the unit under the cockpit floor! That may have contributed in the early years, most certainly in recent times.
I am delighted to report that after all of the interfacing with Kerry and his intellectual guidance, I now have a consistent deployment of the 'Auto-Chute' on demand. With 5 consecutive test, and all is well!
Two new main tires are on order, and the Draken will be fitted with a fresh set of rare-earth magnets.
We will soon be ready for more exciting display with this magnificent jet!
Take care,
Frank.
Now back to the Draken ...
In a previous post, I mentioned how I was pulling my hair out regarding the continued failure of the 'Auto-Chute system.
The jet was blocked up off of the wheel sensor side to begin further troubleshooting.
Then the removal and detailed front/back inspection of the actual Hall Effect sensor...and its related wiring.
One of Kerry's strongly recommended ideas, was that the H/E sensor was protected by a G-10 mount with a peep hole enabling the sensor a clear view to the magnetic field pulses.
This provided great tire side wall protection for those 'other-than-normal' landings and side loads during take-off, and landings.
I spent the better half of two days over the weekend troubleshooting with negative results. Eventually I had to pull away and drink heavily to consider my next move.
A dear and long time friend and I were playing catch up on the phone when I shared my dilemma with him. I asked him how to troubleshoot a 'Hall-Effect' sensor, cause I'm a dummy. My friend, Kerry Sterner, (aircraft designer extraordinaire), and brilliant fellow, asked a few in response to mine.
You see, Kerry was instrumental during the initial build 14 years ago! He resolved numerous hurdles and engineering translations as the Draken originated in Germany. The kit was typical of the German philosophy with regard to model kits....place turbine here, install radio equipment in this general area, install fuel system(no fuel tanks provided) seek your own set-up.
I constructed a mock wheel out of cardboard, and this would allow me to test both negative, and positive polarity on the sensor. this carboard was simply attached to a variable speed drill and simulated tire RPM.
Test # 1, negative magnetic pulses failed.
Test # 2, positive magnetic pulses triggered the system! I was now on to something!
My take-aways from the flurry of weekend activity...
1-Always, always check and confirm the uniform application of magnetic polarity for the hall effect sensor! No where in the printed guidance was this critical point stated. I've just been occasionally lucky
over the years when replacing lost magnets in the tire side-walls. And the currently installed tire magnets were found to be completely wrong! Two in sequence were negative, with the following two positive.
No wonder now why I had a lousy two seasons ... the sensor would read two pulses, then discard the next two, and repeat this during the landing roll-out and fail.
Over the years of operating this jet, I have had great seasons of chute deployment, then several back to back with no chute...and usually after replacing lost wheel magnets.. who would have 'thunk' it?...DUUUHHHH!
2-Routinly dig into and under the installed electronics to "verify" the wheel-speed RPM sensor is properly seated into the microprocessor! Duuuhhh #2 !
The RPM sensor pig-tail was found nearly completely out of its seat on the unit under the cockpit floor! That may have contributed in the early years, most certainly in recent times.
I am delighted to report that after all of the interfacing with Kerry and his intellectual guidance, I now have a consistent deployment of the 'Auto-Chute' on demand. With 5 consecutive test, and all is well!
Two new main tires are on order, and the Draken will be fitted with a fresh set of rare-earth magnets.
We will soon be ready for more exciting display with this magnificent jet!
Take care,
Frank.
01-27-2021, 08:57 AM
#122
Thread Starter
This is a 1/5th scale model designed by Mr. Manfred Eberhard.
Molds were then produced by one of Germany's finest large scale model builders, Mr. Peter Liebetrau.
In 2007 there were only 7 produced, three went to customers in Europe. Two were shipped to the USA. I along with David Searles from the west coast got those.
One of them destroyed during shipment to a customer, and subsequently rebuilt. No follow on history for that one however.
And the last one went to the fellow representing Austria during the 2010 World Jet Master in Europe.
Snap forward to today's availability, and you have only one choice.
'Airworld' models of Germany, I believe, may still produce the jet? Its been completely redesigned in that the complexity that I faced is no longer the case. Instead of '14' air cylinders to doors, speed brakes, gear, etc. etc. The jet now comes with electric actuators for all of these systems.
You'll have to check with the reps on that.
Let me know if you get one as I would be delighted to ensure your success with it.
Frank
Molds were then produced by one of Germany's finest large scale model builders, Mr. Peter Liebetrau.
In 2007 there were only 7 produced, three went to customers in Europe. Two were shipped to the USA. I along with David Searles from the west coast got those.
One of them destroyed during shipment to a customer, and subsequently rebuilt. No follow on history for that one however.
And the last one went to the fellow representing Austria during the 2010 World Jet Master in Europe.
Snap forward to today's availability, and you have only one choice.
'Airworld' models of Germany, I believe, may still produce the jet? Its been completely redesigned in that the complexity that I faced is no longer the case. Instead of '14' air cylinders to doors, speed brakes, gear, etc. etc. The jet now comes with electric actuators for all of these systems.
You'll have to check with the reps on that.
Let me know if you get one as I would be delighted to ensure your success with it.
Frank
01-27-2021, 09:12 AM
#123
Glad you solved the riddle! Too complicated for me though. I would have just actuated the chute with a switch. That way I could actuate it in flight, in the pits, while starting or taxiing, etc :P
Glad to hear you are close to putting your empty travel bags on the top shelf of the closet. It is quite strange to me that I don't miss work, I really enjoyed flying, I think our career field is particularly well suited for retirement, we are used to being home anyway. I don't feel like I'm retired, I just feel like I haven't flown in a while... I do miss the "travel" part though, all of my favorite haunts and layovers denied. So make sure to cherry pick the lines during your last months! And get well soon, we need you at 100%
Is that a "Bolt" there? My experience was this. I started with a CARF Hawk and loved it, then got an Ultra Flash and was just, meh, it just didn't do anything for me. A BVM F-16 was great and a SM Cougar too, fantastic (My Cougar made the cover of Jet International) so I'm a scale guy now! But last year the sport bug bit me again and I got a CARF Mephisto, It is a blast! I think you will be pleasantly surprised. May I suggest you start practicing the jet precision aerobatics routine now?
Glad to hear you are close to putting your empty travel bags on the top shelf of the closet. It is quite strange to me that I don't miss work, I really enjoyed flying, I think our career field is particularly well suited for retirement, we are used to being home anyway. I don't feel like I'm retired, I just feel like I haven't flown in a while... I do miss the "travel" part though, all of my favorite haunts and layovers denied. So make sure to cherry pick the lines during your last months! And get well soon, we need you at 100%
Is that a "Bolt" there? My experience was this. I started with a CARF Hawk and loved it, then got an Ultra Flash and was just, meh, it just didn't do anything for me. A BVM F-16 was great and a SM Cougar too, fantastic (My Cougar made the cover of Jet International) so I'm a scale guy now! But last year the sport bug bit me again and I got a CARF Mephisto, It is a blast! I think you will be pleasantly surprised. May I suggest you start practicing the jet precision aerobatics routine now?
01-27-2021, 09:31 AM
#124
I don't mean to butt in here but maybe my experience can help. Airworld now makes the Draken. I got mine from Gotz Vogelsang at Team Aeroscale and while I don't think he is importing the Airworld kits anymore he may be able to help. Trond Hammerstad of Exact Aircraft in Norway is a professional builder who is semi retired from building now but also may be able to help you get a kit. He is active on Facebook. My issues were always related to contact with Airworld. So you could start with them but don't be surprised if that is difficult. I waited literally years for the cockpit kit, Gotz could not get one for me from Airworld, but then a chance encounter with Trond had him being successful in acquiring one from Airworld. Bottom line, there's no easy answer. Good luck if you go forward with this project.
01-27-2021, 02:03 PM
#125
thanks husafreak
I think I'll have to leave it alone. beyond my poor piloting skills, the plane is not accessible both in terms of cost and availability. I think the best solution is like that of my G-21 goose, that is, starting from a triptych or DEVfus4 program I generate drawings that I use for the construction of model aircraft. in this way the limits are only the imagination.
I think I'll have to leave it alone. beyond my poor piloting skills, the plane is not accessible both in terms of cost and availability. I think the best solution is like that of my G-21 goose, that is, starting from a triptych or DEVfus4 program I generate drawings that I use for the construction of model aircraft. in this way the limits are only the imagination.
The following users liked this post:
husafreak (01-27-2021)