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Foam Flat Wing Funfly
Video available here.
Inspiration for this plane came from crazyherb and the idea
of making a super sized glow powered 3DX. After I started this project I came across
a thread on RCU from southern_touch9. He already built one of these and says it's great!
Material: 3/4 inch blue foam insulation. Engine mount is 1/2 inch ply. 3/16 inch dowel spars.
Glues: ProBond Poly GLue and Epoxy.
This is a work-in-progress and I will document it as I go. It's taking me a lot longer that I want due to the never ending
project from hell (my basement).
The CAD file can be downloaded here (right click on that link and select save).
Here is a screen shot of the CAD file I am working on.
I now have the wing cut and the 5/32 dowel spars glued in. I used Probond Poly glue to glue them in. I'll
have pics loaded soon. The wing is a simple 48x14 rectangle. I cut it from the 3/4 blue foam with a utility
knife. The stuff cuts very easily. I then used 150 grit sand paper to round the leading edge.
OK, I finally got a little progress done. Here are the pictures of the rough cutouts of the wing and fuse.
To make the fuse I drew a 42 inch line as the center line (and the line where the stringers go). On the drawing
this line is the thick black horizontal line down the center of the fuse. This is my
reference point when drawing the rest of the fuse from the dimensions on the plan drawing. I got a new sharpie
marker and started drawing lines. I then cut it out with my utility knife and a new blade. I then cut out the
rectangle opening for the wing. This foam is 3/4 inch think, so the cutout was 14x3/4. The wing slid in nice
and snug for the trial fitting and picture.
I got the fuse sanded and the vertical stab glued on. This was a big brain fart on my part...I should have cut the
fuse and vstab as a single piece! I also got the engine mount cut out and glued in. For these steps I used
Devcon 5 minute epoxy that I picked up at Lowe's. It worked well with the foam.
I edited out the parts that were chnaged for clarity. I tried running yardsticks down the side of the fuse, but that was not a good idea.
I made a MAJOR structural change today. I took off the 2 yardstick fuse "spars" and put a cap around the fuse edge,
all the way around the fuse. This was made from yardstick, so it's 3/16 thick and I cut it to 3/4 inch wide....then same thickness
as the foam. This is much stronger and the tail doesn't flex nearly as much as it did before. You can see it in these pics.
I then got some more covering done. I hope to have it all covered in my next building session.
Got the top covering finished and I mounted the landing gear. I need to take them off and cut them down. It
has crazy legs syndrom.
Here's the radio and motor installation pics. My weight is 4lbs 8oz.
The battery is not shown, but is included in the weight.
I'm still sliding it around to get a safe, slightly nose heavy CG for the 1st flights.
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