Some folks like to build big, thin F2D's. The standard Beliaev/Faisov design has a 12-13 in. root chord, and a 5.5-7 in. tip chord and somewhere around 440 squares. The root is usually 1.8 or so thick, about 15%. The tip about 1.1 in., about 17%. Having tried thicker wings in other apps, it looks like NACA was right on in their Tech Report 824?, which tested the NACA 00 symmetrical sections from 9%(I think) to something like 26%. Somewhere in the range of 24% appears to give the best balance between increased lift with minimal increased drag. So I tried it on this plane. The root is 23%, the tip, by mistake, turned out 26%. Wing area is 380 squares, and the span is 45.5 in.
Maybe later in the year, weather permitting, I'll be able to get in some good matches with these against Roy Glenn or Andrey. I haven't been able to talk anybody in our club into flying them cause F2D is kinda quick. So far the smaller, thicker plane flys just as fast as any of the larger planes. The airframe builds up about 1-1.5 oz. lighter than any other foamy I've done, so the wing loading is pretty good. It gets through tight turns significantly faster than anything else I've gotten ahold of, including a couple of Andrey's good planes. It does need some trimming work. I didn't luck out on that like I did on the previous #07 design.
Talked to Larry Driskill. They're trying some thin wing designs. It will be interesting to see how it works out. I haven't been able to figure out a spar design to hold up on a really thin(9%) wing. It takes a ton of reinforcing or a lot of carbon fiber in the middle to hold things together.
This is the kind of stuff you get into when you can't round up enough people to fly every weekend.