Q-500 Racing Discuss AMA 428, AMA 424, and any other variants of Quickie 500 racing

1/64 Plywood Wing Skins Any Good?

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Old 10-15-2008, 07:21 AM
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BobHH
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Default 1/64 Plywood Wing Skins Any Good?

I’m getting ready to build some foam wings for my 428 design and was wondering if anyone would share their experiences with plywood wing skins. I’ve found the 1/64 birch plywood skins at SIG. I know a few years ago there were guys using them in 428. Are they still being used? What are the plus and minuses over 1/16 balsa skins?

Thanks,

Bob Harris


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Old 10-15-2008, 07:22 AM
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daven
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Default RE: 1/64 Plywood Wing Skins Any Good?

Weight has been the biggest issue with 1/64 ply skins. Also, quite a bit more expensive than balsa.
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Old 10-15-2008, 08:19 AM
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BobHH
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Default RE: 1/64 Plywood Wing Skins Any Good?

Dave, My prototype came in at around 5 oz light using 3/32 standard balsa skins and solid 1-1/2 trailing edge stock. They claim the skins weigh in at 2 oz for a 12 x 48 sheet. Any structural concerns with being in compression? My calculations reveal tension would be OK. Yep cost is a factor.

Bob Harris
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Old 10-15-2008, 08:51 AM
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Default RE: 1/64 Plywood Wing Skins Any Good?

A buddy built a F1 with ply skins some years ago. Really pretty job. Wing folded on about the 5th turn.
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Old 10-15-2008, 09:33 AM
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daven
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Default RE: 1/64 Plywood Wing Skins Any Good?

Bob,

If you coming in 5 oz light, you definately want to beef up areas of your plane. If want to add it to the wing, that is fine. The trick is to get your plane as strong and stiff as possible without adding weight (or being over).
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Old 10-15-2008, 11:10 AM
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BobHH
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Default RE: 1/64 Plywood Wing Skins Any Good?

Dave you have a point there but if there is an issue with the skins in compression whereas they will wrinkle into the foam and fail I was wanting to know before going down that road. I though we may have some guys here who have tried it before.

Bob Harris
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Old 10-15-2008, 01:00 PM
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luv to race
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Default RE: 1/64 Plywood Wing Skins Any Good?

why re-invent the wheel? unless it was cheaper (which it's not according to the thread) or easier to make wings?? plus your wing cores would have to be thicker to make minimum thickness when using 1/64 ply as opposed to 3/32 balsa.

I'd just stick to what you were doing. At 5oz under weight, you could glass the wing and paint it..

WC
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Old 10-15-2008, 07:29 PM
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Bill Vargas
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Default RE: 1/64 Plywood Wing Skins Any Good?

I've seen 424 planes with glass covered blue foam cores that did well,,, in 428 I saw one guy who did his with CF,,, it was cool. He glued his ailerons on with silicon,,, the aileron leading edge was an aluminum tube glued to the aileron/wing. It flew very well right up till he crashed or midaired or something like that.


BV
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Old 10-16-2008, 06:59 AM
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Alabama Racer
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Default RE: 1/64 Plywood Wing Skins Any Good?

Back in the early '90's, i used to skin my wings with 1/64th ply. That worked great
with the Rossi's we were running at the time. It made a stiff wing and was strong enough
for the Rossi. When I switched over to Nelsons, the wings were not strong enough and
folded. Around the same time, Jim Katz and Pete Rouark were using Obechi to skin
.15 quarter midget wings. However, it is not strong enough to hold up to todays speeds
and loads. The top skins collapse from compression. If you are just racing Thunder Tigers,
it might work with a spar and fiberglass inside.
Brad
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