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Foam sheeting vs, Ribbed

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Old 06-22-2002, 08:38 PM
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Cyclic Hardover
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Default Foam sheeting vs, Ribbed

What would weigh more, A foam sheeted wing or one that was ribbed out.
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Old 06-22-2002, 08:57 PM
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RCPilot100
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Default Foam sheeting vs, Ribbed

Depends on the technique and materials used. Could be either one. My buddy who builds some big ones for me once in a while is building me an Edge right now with a new wing technique. Uses a wing jig to hold blocks of foam - puts templates on each end and cuts them like you would a foam blank, except these are now foam ribs - puts spars - wing tube - carbon fiber - all as needed and sheets the thing. Strong as any other technique and don't weigh nothing.

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Old 06-23-2002, 03:03 PM
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ilikeplanes
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Default Foam sheeting vs, Ribbed

The only foam wings I have built are on gliders. They are exceptionally strong, straight, and light. Also, most all of the F3A and advanced IMAC pilots are using foam wings. You really have a lot of freedom in the construction details. Here is a short list of options from my limited experience:
1) Foam density, 1lb, 2lb, 3lb/cubic foot. (white, pink, blue)
2) Sheeting, balsa, obeechi, glass, carbon, or any combination.
3) Spar, wood, wood wrapped with carbon filament, no spar at all.
5) Adhesive. I always used epoxy to avoid warping but others have used plain wood glue, spray adhesive, polyurethane, double sided tape.
6) finishing, plastic covering, paint, none/natural.

Even though most of my planes have rib wings (kits and ARF) I firmly believe that a superior wing can be made using a foam core or molding process.
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