Piper Cub Swappable

by Extreme Rc | December 22, 2013 | (8) Posted in Projects

Hi guys! This is my first flitetest article, so please excuse my lack of knowledge of the forum and posting/tools. This is a swappable piper cub, originally designed, and is contructed using the balsa former technique. Please donate so we can finish the plans and post them along with a build videos and a countless amount of other planes and plans. Plans and a build video will be posted soon! Please donate, we are working hard on a easy to build, nice looking edf jet made out of dollar tree foam.

COMMENTS

Wes Vasher on December 27, 2013
I just designed and built the wing and empennage for a Cub swappable. My wing looks just like yours.
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Extreme Rc on December 27, 2013
Hi, thanks! Cool thats nice, you should post the pics!
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Jghanson25 on December 28, 2013
Yes! Please for plans and a build video! Awesome cub! Any flight footage?
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Extreme Rc on December 29, 2013
thanks so much, were posting plans and a build video very soon!
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Extreme Rc on December 29, 2013
We are located in new jersey, and the weather is pretty bad so we cant fly. sorry :(
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alibopo on December 28, 2013
Looking good! :) A few words of advice; it's got a short nose and a long, fairly heavy looking tail - don't put those rudder and elevator servos anywhere near the back or you'll need a big pile of unwanted weight at the front to get the balance! Stick your servos under the wing - as close to, or even in front of, the predicted CG. My Velie Monocoupe, which evolved (after several crashes) into a high wing bush plane, originally needed a lot of weight in the nose to get it to balance, even with the servos well forward. In the rebuilds I extended the nose and moved the servos even further forward. The additional nose length allowed the motor and battery weights extra leverage to balance the tail. I was able to get rid of most of the ballast weights. Another thought - depending on the strength of your wing, and the centre join, you might want to add functional wing struts to reinforce and stabilise the wings. These don't need to be super-sturdy - as they'll act a good distance out from the fuselage - but they do take care of a lot of the bending force that would otherwise get concentrated where the wing meets the fuselage and hold-down elastics. Have a look at some of the cargo lifters (and even the original Fowl Flyer!) with similar top-mount wings to see how this is done. (Also have a look at my original Velie Monocoupe build article and my later AVRO 539B biplane for inspiration.) A lot of the wings on commercial models have only cosmetic (fake) braces, or are completely un-braced - instead they are carbon reinforced. And a lot of Armin wings (foam board) have built-in reinforcement from carbon tubes or dowel. It may be your wing is strong enough, or it could just survive the first few hours of flying but then start to fatigue at the wing root - look for small folds forming just outboard from the wing elastics. Better to reinforce from the beginning. If you need to retrofit can I suggest long plastic control horns for attachment points on the wing. Cut off the pegs or strip that would normally stick through the control surface and push the arm through a slot made in the top of the wing. Glue them firmly in place and use the control rod holes to both secure a washer plate stop them moving back up through the wing, and also attach your wing strut to. Hope to see your plane flying soon - cheers, alibopo.
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Extreme Rc on December 29, 2013
Thanks for the advice and we'll definately impliment that in the build video! cheers :)
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anonymous rc pilot on December 28, 2013
once you get this plane flying well i would suggest adding stol flaps for scale looks and performance. flaps wouldn't be necessary just an interesting option
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Extreme Rc on December 29, 2013
Great, and maybe we will put flaps on it.
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Extreme Rc on December 29, 2013
Hello! We are making the plans but we don't know what program we should use to draw out the plans, because we already have it 3d on sketchup.
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Windburn on December 29, 2013
I haven't used them myself (I don't use Sketchup), but there are some plugins for unfolding models. This article should be a good tutorial for doing that: http://flitetest.com/articles/sketchup-for-rc-aircraft-design-tutorial-67
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Extreme Rc on December 29, 2013
please reply and tell us what you think
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Extreme Rc on December 31, 2013
Hi guys, thanks for all the suggestions, support and feedback! We are scheduled to be posting the plans and build video in the next few days! (maybe even today!) Again, thanks so much to all of you out there and we hope you enjoy this project
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Kevinjt4 on January 20, 2014
Any word on the release schedule of the plans? My 7yr old daughter wants me to build this as her name is Piper as well.
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Piper Cub Swappable