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Thread: laminating spruce for box spars

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  1. #1

    Join Date
    Apr 2012
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    14

    laminating spruce for box spars

    Plans for the taylor monoplane I am building call for solid spruce upper and lower members boxed in with ply to make the center spars... they no longer carry spruce thick enough anywhere, so Aircraft spruce is asking if I want to laminate two pieces together to make each member. Is 2 boards correct, why not 3 or 4? How do they need to orient the grain, and more importantly the actual lamination? If you are looking at the center spar as if it were installed, end on, then should you see two pieces on top of each other or besides each other (|| or =). Attached is a picture of the center spar that I am having to recreate, spruce dimensions are 1"+11/16" by 2.5" Thank you.
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