Split Flaps on a foam wing - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-16-2014, 10:01 PM   #1
Mike Sebastien
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Split Flaps on a foam wing

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Putting split flaps on a foam wing. Can anybody give me some ideas how to.
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Old 10-17-2014, 06:04 AM   #2
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Re: Split Flaps on a foam wing

Is it an airfoil or flat slab? Length of panel?

Asking since it seems a lot of C/F reinforcement may be required if surface of any size. I had the same thing on the Harvard and used C/F tubes along the leading edge to transfer the input from the horn to the panel and from the center section to the outer wing panels that were at a different angle, (THAT was fun!). The tubes were bonded to the ribs the full length and the center section also had a C/F rod embedded near the trailing edge to prevent loads from the outer panels twisting that section.

Along with providing an extremely stiff control surface, this system was designed to transfer torque along the C/F tube to the ribs and then to the panel itself.

There were semi-ribs for the top surface that had notches to clear the C/F tube and were within a pair of semi0ribs bonded to the flap surface. All this was to help retain strength and rigidity. Thought the original manual system of simply cutting the existing ribs in half from the false spar to the trailing edge nowhere near strong enough.

NOTE: I formed those ribs and flap panels by sandwiching glass cloth between two layers of 1/64" ply. I've used this method to build spars and firewalls for years and by building back to the original thickness by starting with multiple thinner plywood sheets glassed together the final composite product is rigid and nearly indestructible and can be tailored by the number of glass layers in each ply and stack count, (think a Dagwood sandwich). By minimizing the epoxy amount and applying pressure to squeeze out any excess the weight is also close to what the original thickness material would be.

Imagine it may be a viable trick to strengthen foam structures or sheets.
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Old 10-17-2014, 10:05 AM   #3
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Re: Split Flaps on a foam wing

Hi Mike- My questions would be the same as Gary.

Also- how big is the wing in question? the size will depend on how much re-inforcement the flaps will need. Small wings(and small flaps) you may be able to get away with a structurally thin flap, but a bigger one will need some form of stiffening.

Pictures? That would be handy too. Looking forward to the development of this thread. I think we can all learn/share something from this.
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Old 10-31-2014, 07:25 PM   #4
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Re: Split Flaps on a foam wing

I am fidling with flaps on my Constellation...I too am using a foam wing.
I hot wire slots and channels according to design ...the use of assorted
hot wire devices with jigs makes it easy.I use these methods all the time.
Your flap is built up,your wing holds the anchor blocks...
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