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Author Topic: thick trailing edge  (Read 2341 times)

Offline Bootlegger

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thick trailing edge
« on: September 25, 2015, 11:47:42 AM »

 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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Offline Mark Scarborough

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Re: thick trailing edge
« Reply #1 on: September 25, 2015, 11:56:49 AM »
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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Offline David Hoover

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Re: thick trailing edge
« Reply #2 on: September 25, 2015, 12:27:42 PM »
Quote from: Mark Scarborough on September 25, 2015, 11:56:49 AM
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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Offline Dennis Toth

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Re: thick trailing edge
« Reply #3 on: September 26, 2015, 06:46:35 AM »
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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Offline Avaiojet

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Re: thick trailing edge
« Reply #4 on: September 26, 2015, 08:10:11 AM »
Quote from: Dennis Toth on September 26, 2015, 06:46:35 AM
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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Online Lauri Malila

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Re: thick trailing edge
« Reply #5 on: September 26, 2015, 10:37:05 AM »
...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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Offline Avaiojet

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Re: thick trailing edge
« Reply #6 on: September 26, 2015, 10:46:08 AM »
Quote from: Lauri Malila on September 26, 2015, 10:37:05 AM
...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 Trolled, you know you're doing something right.  Alpha Mike Foxtrot. "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten. "No amount of evidence will ever persuade an idiot."- Mark Twain. I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.   Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Target

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Re: thick trailing edge
« Reply #7 on: September 26, 2015, 10:55:09 AM »
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
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