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Old May 19, 2015, 01:22 AM
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Build Log
1/12 Scale F-35B STOVL Design & Build

Hey guys,

Apologies for the cross-post. I've started up this build thread down in the VTOLs section, but I figured people here would find it interesting. I'm working on a scale F-35B with full STOVL capability, and have finally made enough progress to justify posting the project. The power system is already complete and the hover test rig is flying. I'm doing the design work in CAD and used 3D printing for the swivel nozzle assembly, roll ducting, and various other parts. Here are the power system specs:

- Twin ChangeSun 90mm fans with 1600kV outrunners
- Turnigy Plush 100A ESCs
- 2 GForce 6S 3300mAh 40C packs in parallel
- KK2.1 flight controller with OpenAeroVTOL 1.1

I'm currently working on a foamie airframe for transition testing. It'll have a wingspan around 36" and a length around 50". I'll have some renders of that design shortly. Once I use that to do some experimenting with transition, I'll start design work on the scale airframe. It'll be mostly balsa and ply with a fiberglass skin, and perhaps foam core wings. The hollow-molded composite method I used on my X-47B was nice, but requires much more tooling and setup work than I'd like.

Let me know what you think! I'm not sure how best to balance between this thread and the one down in VTOLs. Perhaps I'll document most of the build here while posting more general updates there.

Latest hover test flight:
R/C F-35B Hover Testing (0 min 53 sec)


Swivel duct operation (before wiring and electronics were cleaned up):
R/C F-35B Swivel Nozzle Operation (0 min 15 sec)


Link to the post in VTOLs: http://www.rcgroups.com/forums/showt...9#post31660570
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Old May 19, 2015, 02:30 AM
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Truly impressive. Thanks for posting. I look forward to following your progress. And wish you success.
Looking forward to seeing the finished result/video

Chris
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Old May 19, 2015, 04:51 AM
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How are you doing roll and yawn control? The side ducts look fixed.
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Old May 19, 2015, 06:40 AM
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Neat
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Old May 19, 2015, 07:04 AM
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Falling with style
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Awesome, keep it up!
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Old May 19, 2015, 09:28 AM
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Quote:
Originally Posted by lrb75 View Post
How are you doing roll and yawn control? The side ducts look fixed.
The roll ducts are fixed, but the flow through them is variable via servo-controlled scoops in the main duct. Yaw is controlled by rotating the rear nozzle left or right.
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Old May 19, 2015, 01:58 PM
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. How much does the rig weigh so far? How much reserve lift do you have ? Nice job so far looks like you have gotten farther than any other vtol F 35 that I have seen.
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Old May 19, 2015, 03:28 PM
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Here is one commercially available

http://easytigermodels.com/index.php...t8ivim914dh1g7
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Old May 19, 2015, 05:46 PM
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it wasn't me flying that plane
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Really cool attempt at trying to mke this work..If you can get by the weight issues with powering 2 fans you will be well on your way to making this work.......................Chris
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Old May 19, 2015, 06:31 PM
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Brilliant, real art work, hope it will work in practical terms. Be quick to patent it before someone copies it!
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Old May 19, 2015, 07:09 PM
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Well, there's no original ideas here. Plenty of aerospace companies already own patents for the swivel module. I just made it smaller!

Not sure how much the rig weighs as I don't have a proper scale. It requires a bit over half power to hover, and total static thrust should be around 12lb peak minus the ducting losses.
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Old May 19, 2015, 07:18 PM
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Wow !! Very Cool !!!
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Old May 19, 2015, 10:42 PM
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Team EJF >>>WHOOSH>>>
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The new HV Lipo packs coming from Hyperion could increase your power for the same weight too.
Nice work on all levels!
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Old May 19, 2015, 11:49 PM
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I've thrown together most of the design for the foamie flight test airframe over the past couple of days. I might actually keep this around for a while before moving to the scale airframe - it looks kinda cool.
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Old May 21, 2015, 11:45 AM
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Really cool project!! I really hope you succeed and we can see it fly .
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