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Old Mar 12, 2002, 09:44 AM
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Pennsylvania
Joined Dec 2001
87 Posts
Will 2mm coroplast work for elevons?

Yesterday I ordered some clear 2 mm coroplast. Will this be thick enough for elevons? If not can I double it up? I also ordered some 5.9 x 5.9 graupner cam race props, a new prop adaptor, and 12 500ar cells. I can't wait to test it out. I am going to make everything out of the clear coroplast. Last Friday I recieved my Kontronic drive 150. I should be drawing over 20 amps with this setup. I think this should give me the power I am looking for, but hopefully the weight of the extra 4 cells won't weigh it down too much for slow flight.
Hildy
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Old Mar 12, 2002, 09:50 AM
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Mark Wood's Avatar
United States, CA, Bear Valley Springs
Joined Feb 2000
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What are you building, Hildy? A Zagi or other wing perhaps?

mw
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Old Mar 12, 2002, 09:58 AM
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Pennsylvania
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Opps, forgot to mention that. I am rebuilding my Zagi Razor. I am not retaping it, just upgrading the power system, and making coroplast elevons, tray, canopy, and winglets.
Hildy
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Old Mar 12, 2002, 10:01 AM
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Pennsylvania
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I am also thinking about reinforcing it with a carbon fiber rod. Where can I buy one?
Hildy
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Old Mar 12, 2002, 10:04 AM
Owner of the real Petey
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Vista, CA USA
Joined Feb 2001
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2mm will work fine for wing tips and in fact that size if preferred over 4mm for wing tips. 2mm will not work good for elevons because it will flex too much.
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Old Mar 12, 2002, 11:21 AM
Lifes 2 short, go sloping
colorado @ 5500feet
Joined Sep 2001
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I tried 4mm cloraplast for my elevons, they flexed way too much so I'd say 2mm won't work. Go with balsa if you put zagi tape over them they will be plenty strong, and use the 2mm for the winglets and make the flumes (channels) run vertical on them.
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Old Mar 12, 2002, 11:47 AM
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Pennsylvania
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Thanks, I origonaly thought it would be better to run the channels in the winglets horizontal. I am just going to get some balsa from the lhs and cover them with tape.
Hildy
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Old Mar 12, 2002, 12:40 PM
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United States, CA, Bear Valley Springs
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Why not channel the flumes horizontally? It allows air to pass through the winglet almost acting as an airfoil in itself. Vertically I would think would present more drag.
Just wondering.

mw
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Old Mar 12, 2002, 01:15 PM
Registered User
Idaho
Joined Oct 2001
261 Posts
I have used 2mil for elevons on a Mugi. Worked fine as a slope soarer. I dunno about using it for power flight though. On my IC .47 size planes I use 4mil as control surfaces. It works just fine. You can also layer two peices of the 2mil for elevons. Make one layer with the flutes running spanwise then put another layer on with the flutes running perpendicular. You can also stiffen up the coroplast by running bamboo skewers down the flutes. Or dowels that would fit.

Just FYI.
Josh
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Old Mar 12, 2002, 01:48 PM
SAM Elec GrdChmp04,07,10,12,14
Jay Burkart's Avatar
Smithfield, Ky.
Joined Sep 2001
1,080 Posts
Carbon fibre everything

Here's a good place to get all your carbon fibre
goodies.
Arero Space composites.


http://www.deltronix.com/public/acp/ACP-CAT.HTM

George is great to deal with.

I've bought a lot from them over the years.
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Old Mar 12, 2002, 02:09 PM
MX
Embedded Systems Engineer
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Grass Valley, CA
Joined Sep 2001
3,732 Posts
I replaced the balsa elevons on my FMA Razor 400 with 2 layers
of the 2mm black coroflute. One layer is hinged and glued to the
TE of the wing, the second layer is narrower and glued to the
first to stiffen the elevons. It looks like they should work alright,
but they made the wing tail heavy. I still have to get it
balanced out before flying.



Click for larger image

MX
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Last edited by MX; Mar 12, 2002 at 02:17 PM.
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Old Mar 12, 2002, 03:38 PM
Terry Dunn
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United States, TX, Lubbock
Joined Jan 2001
874 Posts
I think the 2mm doesnt have the torsional strength necessary for elevons. Stacking 2 pieces of 2mm would make the weight penalty of using coroplast significant. It would weigh much more than a similarly sized piece of 4mm coroplast (double the number of inner walls, plus any adhesive used ). 4mm is the way to go (flutes running span-wise). The taped balsa will work too.
MX, try a set of 4mm elevons and see if that fixes your CG problem.
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