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Question regarding orientating grain for strength

by IAmSupernova
posted 02-13-2017 08:19 AM

2 replies so far

View Planeman40's profile


1502 posts in 3567 days

#1 posted 02-14-2017 01:25 PM

I’ll take a stab at this as I have been involved in building two homebuilt aircraft and know the requirements for wood structure according to FAA specifications and have read some of the research that went into this (mostly done in the 1920s and 1930s). When building a wood wing spar and knowing your life depends upon it being done right, you pay attention to these things.

The strongest grain direction is of course lengthwise with bands of growth at 90 degrees to the greatest stress. You can get this information through the Experimental Aircraft Association or the FAA.

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

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14 posts in 1681 days

#2 posted 02-14-2017 08:46 PM

That’s actually the opposite of what I would have assumed. Glad I asked. I’m going to be building a lathe soon and while I’m sure my design is fine without considering the bands themselves, it never hurts to take extra precaution. Thanks.

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