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Split Elevon Air Brake Testing on Flying Wing

Posted by Trent at MyGeekShow on February 12, 2014 at 10:00am

I wanted to see if I could use a split elevon and some serious mixing to use a split elevon as an airbrake for my flying wing. The Raptor 100 is light and pretty tough, a perfect test platform! Lets try it.

Split the elevons in 2/5 and 3/5 lengths (to compensate for the leverage on the outer wing), added two more servos and some serious mixing on my 9x...

Worked great!

I'm planning on using something similar on my larger, heavier Raptor 140B and new Raptor 140C. These two airplanes are much heavier and suffer from a very long glide ratio and high speed stall, meaning a very long approach.

Have you tried this before? Anything I could to make it better?

Thanks!

100, geek, my, mygeekshow, raptor, show

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Comments

Justin Martin February 15, 2014 at 11:30am

Trent, great application. This is used quite commonly in the sail plane world and it is called "crow." The beauty with having the outer aileron deflect up, is it changes the practical incidence of the wingtip. So long as there is not a sever stall, it actually reduces the chances of tip stalling as the center wing will stall first (planform dependent)
Moderator

Brian February 13, 2014 at 8:36pm

Cool mod, had a stryker about 4 years ago that had a similar setup. Got the idea from a video online, which I can no longer find. It was cool, but used for airbrakes. Would do from 80mph to 0 in perfect control very quickly.
Trent at MyGeekShow February 13, 2014 at 7:29am

Well darn. Moderators! Do you know why this is happening? I've submitted a full screen true and something is automatically turning it to false...
Alexander Malikov February 13, 2014 at 7:24am

Sorry, I don't see any changes...
Trent at MyGeekShow February 13, 2014 at 7:07am

Try fullscreen now, I've changed the html to allowfullscreen="true"
Trent at MyGeekShow February 13, 2014 at 6:43am

Mark: Strange, I've always just used what YouTube provides, which has: allowfullscreen="true"

Eli: You sure can! You can do this: https://code.google.com/p/ardupilot-mega/wiki/Dspoiler as well...

Alex: Yeah, I see that as well, not sure why it does that. The code I paste into the blog editor has allowfullscreen="true" I'll see if I can edit it. Strange! It works for me just fine...
Alexander Malikov February 13, 2014 at 6:33am
Eli Cohen February 13, 2014 at 5:20am

You can do all the mixing via ardupilot. Slave all 4 servos to rudder. Restrict the pwm range to only allow them to go either up or down as needed. Change the gains to either plus or minus one to get the correct ones to move and voila! No mixing via tx
Mark February 12, 2014 at 6:11pm

I am on Mac OS X 10.8.5 and full screen works on any other posts and for whatever reason never with My Geek Show.

I know there is an option on YT to prevent people from embedding and I thought there is an option to prevent embedded video from viewing in full screen.

I love your show, but I always have to click on YouTube logo to see it in full screen there.

Here is an idea for air brakes (just an idea, since I have never tested it myself) - since you're using two servos anyway - why not do a split control surfaces like ailerons on A-10 Thunderbolt. They split and used as an airbrakes.
Trent at MyGeekShow February 12, 2014 at 5:42pm

Ben: Cool! Let me know how your testing goes! I'd love to learn from you.

Mark: All embedded youtube players have a full screen option (see picture below). Its not something I can select. You can view the video here or on YouTube, it doesn't affect me in anyway. What device or OS are you using that doesn't allow full screen? I've just tested this page with: Chrome OS, iOS 7, Windows 7 and 8, Mac OSX 10.5, 10.6, Chrome, Safari, Mozilla, and Internet Explorer, and all of them allow me to use full screen.