In this article I am going to show how I built a 232cm (7.5 ft) wingspan B-17 Flying Fortress!
Before this plane my friends and I were only flying 100cm wingspan lightweight planes. So we decided to build something bigger. But the idea was to keep the budget low and to use small motors so we can reuse them later.
We mainly use 7mm depron and 3-4cm isolation board + some aluminium for motor mounts.
The power plant we use is in the links below:
30 Amp ESC | 2200kv Motors | 4S 4500mah 45-90C
I have made the plans myself using an 8 inch prop as a part to compare to get different parts measurements. It took me 5 hours to draw the plans. The next step was to make the motor mounts from aluminium.
These parts were connected with a 1x1cm 1m length aluminium bar and glued to the wings.
Then we started to build all the other parts: elevator (double layer of 7mm depron + 6mm aluminium tube)
The wing's 4cm isolation board, shaped and then with a tool we call "rašpa" we made the airfoil, glued the second half together, and inserted some aluminium tubes to make the wing demountable.
The main body is constructed of 5-6 layers of 3-4cm isolation board glued together and shaped also with the "rašpa." We used that tool for shaping every big part:
And the motor covers... 4-6 layers of 3cm isolation board glued, shaped etc..
Then we assembled the parts together mainly with hot glue and mitopur glue.
Then we added the landing gear and servos, built the canopy, and taped the aileron, elevator and rudder surfeces on...
Then we made a test flight, crashed it, repaired, painted and now we still keep flying, crashing repairing hehe =D
And we also covered it with paper and glue just to add some more strength and to make it look nicer when painted...
The entire process took us 60-65 hours of work but at the end it was totally worth it. =D
We had some problems with the radio. We crashed 3 times due to radio failure, we figured it out only the 3rd time because the first and second time it looked like the plane stalled or something.
Watch the video and be free to ask anything =)
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I can try to make some sort of video for the plans in the near future. Its a little bit of a problem because they are only drawn by hand on a very big paper (app. 2x1m)
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Jeff
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You have a great design now... you just need to tweak it to get it more stable. Keep up the great work!
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