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Equavalent material

Old 03-10-2010, 03:44 PM
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Default Equavalent material

Disregarding weight, a model that I am working on, has a one and only fuselage bulkhead made up of 3/16 inch thick balsa. I only got one slab here and it ain't big enough.

Can I substitute in some 1/16 inch plywood, of which I got a bunch of, or is 1/8 inch birch plywood or 1/8 inch light plywood the same strength then?


Wm.

Old 03-10-2010, 04:11 PM
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Default RE: Equavalent material

why not take 3 pieces of 1/16th and epoxy them togeather? you're piece would be very strong and you could have the right size then.
Old 03-10-2010, 05:06 PM
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Default RE: Equavalent material

3 pieces of 1/16 plywood glued together with a wood glue like Titebond will probably be as strong and maybe even lighter. Cut the pieces so that the grain will run at right angles to each other. Also be sure to clamp the pieces together while the glue is drying.
Old 03-10-2010, 08:28 PM
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Default RE: Equavalent material

ORIGINAL: Laird SS

3 pieces of 1/16 plywood glued together with a wood glue like Titebond will probably be as strong and maybe even lighter. Cut the pieces so that the grain will run at right angles to each other. Also be sure to clamp the pieces together while the glue is drying.
Plywood normally has the plies inside running 90 degrees to each other. Three pieces of 1/16 inch plywood ought to be SUBSTANTIALLY stronger than one slab of common old balsa. Doubt that it will be lighter though.

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Old 03-11-2010, 05:46 AM
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Default RE: Equavalent material

Some models have bulkheads made from 3/32 or 1/8 pieces ( wide strips ) overlapped at the corners and then then the other side is filled in with another piece to make it flush. Makes a 3/16 or 1/4 bulkhead from little material. Best to make the main shape and then cut out the notches for longerons etc after glue has dried.
Old 03-12-2010, 01:51 PM
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Default RE: Equavalent material

Go with the 1/8 ply and just make the lightening holes larger. Or if there are no holes add them. The difference in weight from one single former will be negligable.

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