I was looking around my workshop and I found some Cox .049 engines and some coroplast. I was thinking about cutting out a flat wing of coroplast in the shape of those ripper and slasher combat models. Then I will cut out some wing tips, make some elevons, and use some Hitec micro servos on it.

Would this fly or do I need an airfoil? Is the .049 powerful enough? I was thinking it would have an average chord of 5.5" and a span of 24".

From time to time guys come here with the same question, or even declaration that they are about to try it. So far I can't think of any examples of positive feedback. There was a guy with a 1/2A /coro CL plane called the GRIN REAPER[ best name ever given to any airplane] and it was a big success. I have built a couple of 18"x18" 1/2A PBFs that were made out of 1/4"x1/4" balsa sticks that fly as well as any PBF [I'll bet], and are a hoot to fly even with a BLACK WIDOW. It weighed 9 ozs RTF.

Interesting. Do you know more about this GRIN REAPER or where I can get more information.

Here is my rough design. It will have 3 vertcal surfaces one in the middle and two on the wing tips. I know there is no RX but I think I can find a place to add one. The LE is a carbon fiber rod.

I don't remember where I saw the GR, but it was in this forum last year. That is a good looking drawing! If an .049 won't haul it, it looks barely big enough for a .15! BTW, give yourself some leeway on engine positioning, alot of new 1/2A designs need the engine mount lengthened.

here's the link about grin reaper-
[link=http://www.rcuniverse.com/forum/m_1612629/anchors_1614248/mpage_1/key_grin%252Creaper/anchor/tm.htm#1614248]closet control line admissions[/link]

Thanks for the advice and the link. Did the GR have an airfoil?

I think I'll post in the aerodynamics forum for more info on flat airfoils.

Thanks again!