Looking for profile
 

Hi.
I wolud like to build this airplane myself. I have just two little motors and some depron. Can somebody tell me wich profile i can use?
http://www.rcmart.com/catalog/produc...oducts_id=1818
Thanks.

RE: Looking for profile
 

A simple Clark Y flat bottom shape would be fine. If you want to be fancy you could use a more free flight'ish type with a little bit of undercamber but it's a lot more work to build.

Download Profili from http://www.profili2.com for more airfoils than you ever knew existed. Bonus, the site is in your native language... :D

RE: Looking for profile
 

Thanks for the help. I woul like to buil myself this airplane. I have just two little motors to try. I will build the airplane with all depron. Do you have some link to download a plane like that. Otherwise I will try to take the measures from the pictures.

RE: Looking for profile
 

When I moved into a new house a couple of years ago I had an empty lot across the street, sheer heaven! Houses are there now, RATS! Anyway I experimented with a series of small designs like this one.

With Depron a curved undercambered shape with the upper surface like the Clark Y works fine. It is not that critical.

I have modified the surface to two flat plates joined at roughly the 30 percent chord point, rounded the wing over the edge of my workbench, etc. and they all work OK, maybe not the best efficiency but they do work.

I also went from a rectangular planform to an eyeball ellipse. The ellipse looks great in the air but is not as good a lifter as the high aspect ratio of the airplane in the photos.

I find a eyeball guess of 3 degrees of wing incidence works and balance it roughly at 30 percent mac and it will fly fine.

They are a lot of fun to work with. I had one that flew fine with four motors but when I went to six the battery drain was so high that I could only fly a couple of minutes. It sounded great though.

RE: Looking for profile
 

Thank for the help. Do you know where I can found some project to build one?

RE: Looking for profile
 

Here's some plans for thin fan fold blue foam. Perhaps you can use these for the Depron if you make the designs a little smaller to suit the thinner material? Or if the Depron is between 4 to 6 mm perhaps just build them as is....

http://www.foamfly.com/customer/home...149b5c0fd1fc84