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Building Tips and technical articles. => Building techniques => Topic started by: Bootlegger on September 25, 2015, 11:47:42 AM
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Have some foam wings that have a 3/8" trailing edge and the flaps will be 1/4".Will the difference make the model act/fly funny?
I don't need to compound my problems.
Thanks a lot... H^^
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The Impact has a 1/2 inch trailing edge,, and 3/8 flaps,,
I would say it might HELP it fly better, not hurt it
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The Impact has a 1/2 inch trailing edge,, and 3/8 flaps,,
I would say it might HELP it fly better, not hurt it
However, depending on the length of the flap, 1/4" may be a little wimpy in torsion and that would not make it fly better.
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For the 1/4" flap you could apply 1/2 oz fiberglass cloth with finishing resin (after wetting the cloth down scrape off as much as you can with a playing card then roll with toilet paper to remove last puddles). This gives very stiff flaps and is light weight. After that finish as normal.
Best, DennisT
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For the 1/4" flap you could apply 1/2 oz fiberglass cloth with finishing resin (after wetting the cloth down scrape off as much as you can with a playing card then roll with toilet paper to remove last puddles). This gives very stiff flaps and is light weight. After that finish as normal.
Best, DennisT
Dennis,
That's a great way of doing it.
I used resin and glass cloth on these pieces. Sig Polyester resin actually, thin enough to apply with a brush then blot with toilet paper.
Today Epoxy is preferred and is a bit thicker so spreading it as Dennis suggested is how some do it.
These parts belong to the Mig-3.
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...and not forgetting to put the cloth with fibers running +/-45 degrees, if you want torsional stiffness.
But the 1/2oz stuff is quite gutless, I'd go for at least twice as heavy. Weight gain is zero or minimal. L
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...and not forgetting to put the cloth with fibers running +/-45 degrees, if you want torsional stiffness.
But the 1/2oz stuff is quite gutless, I'd go for at least twice as heavy. Weight gain is zero or minimal. L
Lauri,
I always uesd 3/4oz. I have so much of it. All our R/C pattern ships were covered in it from head to toe.
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If you're using cloth hinges, what I'd do is bond a same diameter aluminum tube to the LE of the flaps, then glass wrap in one piece on a 45° bias as mentioned with glass. Tubing is very torsional stiff.
R,
Chris