Converting an electric "trainer" to aerobatic? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-30-2006, 10:10 PM   #1
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Converting an electric "trainer" to aerobatic?

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I have an electric foamie I made as a trainer for my half sister and some other people, but it is prooving to be an addiction for myself! The airplane has some vertical capabilities, but it is not unlimited. I can go from a hand launch to about 60 feet of vertical climb before it looses steam. Anyway, I want to hotwire a fully symmetrical wing for it and put ailerons on it to do some aerobatics. My plan is to make the wing a tad bit smaller to save on some weight and increase the vertical capabilities of the airplane, that is if the wing loading comes out alright.

My big question is how is the airplane going to handle? Will having a fully symmetrical wing up on the top of the fuselage pose any stability problems? I know that the rolls will not be axial, but more of a circle. What about inverted flight? With the weight of the airplane now on the top, I am assuming that the airplane will be less stable.

The wingspan of the airplane right now is 48" with a flat bottom airfoil, box type wing. The dihedral angle is between 15 and 20 deg. I will have to weigh it to get its true weight, but I am assuming it is around 25oz. The motor is an E-flite park 400 outrunner, 960kv. The symmetrical wing will probably be around 35-40", but Ill have to check the wing loading once I get the all up weight right now.

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Old 10-06-2006, 12:10 AM   #2
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It will work. But don't be afraid to try a mid wing aircraft. Try a slope GWS Formosa - use the engine and batteries you already have. There is a ton of electric talk on this site: Anyway it is always fun to try new ideas in electric. I call them "evil experiments!"
Formosa inverted =
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Old 10-06-2006, 10:45 AM   #3
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Most of the 60 sized "trainers" have at least a semi symetrical wing. You will probably not have a problem. Inverted flight will be improved, it may move a bit quicker too.

In short. Go ahead. What's the worst that can happen?
Michael Gyger
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Old 10-07-2006, 08:40 AM   #4
ron van sommeren
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Calmato Sport 40 electrocuted:

Discussion in y'ole country:
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Old 10-07-2006, 09:40 AM   #5
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Electric symetrical wing

Hi Steve,

I think a lot of us have found matching the motor and batteries to the plane can be the biggest source of aggrevation.

At our club, many members enjoy the Cermark L'il Banshee. This is a small electric ARF with a fully symetrical built up wing, fuselage and it flies well over 10 minutes with a 3 cell 1250mah 15C LiPo battery.

As an option, you can buy the matching brushless motor package. The motor package comes with a brushless motor, prop, prop adapter and mounting hardware and is matched to the plane.

Hope this helps.


Wayne Miller
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Old 10-07-2006, 09:51 AM   #6
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Thanks for the information, guys. I decided to use my OS .46ax on an airplane instead. I scratch built a 3d/fun-fly airplane out of foam mostly. You can see the build thread on it here

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