Airfoil for a Solid EPP Trainer Wing

[Butch777]

I'm trying to come up with a simple airfoil for a light weight EPP aileron trainer.
I'm trying to keep the plane simple and cheap and crashworthy.
I'm using a flat plate wing, with a slightly sanded airfoil. I rounded the top of the leading edge back about a inch and tapered the large ailerons back.
What I'm trying to do is not add too much weight or cost. Keeping it cheap and simple. I've got the prototype flying and its easy to fly, but I'd like it to fly a bit slower and glide better. I have a hot wire, so I'd like to make something a bit better than what got.
I know I can use a flat bottom airfoil, but I don't want to add too much weight because its a solid EPP wing. Would a very slight undercambered airfoil be OK? Or just stick to a thin flat bottomed airfoil?
Thanks , Butch

[Sparky Paul]

You can put a droop on the entire leading edge..
About 25% of the chord back, cut the wing along the span, and reglue the leading edge with its front about 1/4" lower.
This will give the wing camber, make it lift better, and add to the drag.
I used this shape on a couple of foam-board flying wings sucessfully.

[Butch777]

I actully went a bit further. I used a heatlamp to heat the surface just enough to reshape the EPP sheet. But now I have a hot wire setup that I'd like to mess with and couple blocks of EPP. So just looking for a airfoil to start with. Thanks, Butch

[Ollie]

Paul gives very good advice.

If you have a programable radio, you chould change the flat airfoil with flaps and by two wing servos and flaperons coupled to elevator. Use a flat airfoil and wide flaperons 30% to 50% of the wing chord. Use short arms on wing servos and very long flaperon horns so the the maximum throw is only a few degrees. To reduce the elevator sensitivity you might use the same idea, servo short arm and long elevator horn.