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Wing Joiner question

Old 09-07-2020, 02:27 PM
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Default Wing Joiner question

Picked up a Great Planes Super Stearman kit that was partially built. In the kit as designed it had three pieces of 1/8 plywood glued together to make a 3/8's joiner. The kit was missing the ones for the top wing which are straight so it makes it easy to reproduce. Question is would the three 1/8 pieces glued as called for be stronger or would one 7 ply 3/8 piece work just as well? I have material to go either way just wanted to get some other opinions.

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Old 09-07-2020, 03:31 PM
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Provided the grain goes the right way 3 x 1/8" 3 ply will be stiffer than one 3/8" 7 ply.
3 x 1/8 should have 6 laminations with the grain across the joint. 7 ply will only have 4.
Of course this does assume your glue is as good as that used by the ply manufacturer!
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Old 09-07-2020, 06:22 PM
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Adding to Q's reply ... if you use PU or Epoxy glue and make sure all 3 pcs are pressed together while setting - it should be stiffer and possibly stronger than the single 3/8 piece.
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