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shear web grain orientation

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horchoha

Well-Known Member
Joined
Jan 19, 2007
Messages
76
Location
Holden, Alberta, Canada
I am about to start construction on "U" type or "C" type spars. The top of the spar is 1 1/4" x 3/4" Sitka. The bottom of the spar is 3/4" x 3/4" Sitka. I've been reading on the web that the strongest web is 45 degree grain to the spar. I plan on using 1/8" baltic birch and cutting the 5' x 5' sheet diagnally to acheive the 45 degree grain and scarffing the ply to get the length I need. Now the question - grain orientation, should the grain run from the bottom of the spar upwards toward the root (fuselage) to the top of the spar?
This is a high wing basic ultralight 2 seat side by side aircraft with front and rear spars and front and rear struts.
Any input will be appreciated.
 
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