Ron Webb wrote:
Seems like the grain in any wood structure should be the same direction it
was in the tree.
Why would the gods do it wrong?

In a wood bow, they use "quarter sawn" blanks. This ends up with the grain
oriented as above. along the length.





"cmyr" wrote in message
...
In my effort to learn/remember/practice correct building
procedures,I monitor several wood aircraft design sights. In the
emerauders group,much discussion about using a wingspar that was built
and purchased by another builder. The Emeraud spar consists of 2
laminated built ip beams,w ply intercoastals, and boxed front and rear
w/ply. The spar in question was made with vertical grain wood, and
laminated with the grain perpendicular relative to the wing chord, I
believe the spar caps and laminations should have grain approx.
parallel to the wing chord. If anyone has a definitive answer that may
even prevent an accident go yo yahoo groups,emerauders


Ron, read the next to last line--He believes, as do I, that the top &
bottom caps should have their grain parallel to the CHORD , with
the sides of the box extend the full ht of the spar, thus bonding to
every layer of the top & bottom caps--in this case the caps are not true
caps, but are the top & bottom members of the beam---of course the top &
bottom members have the grain running the LENGTH of the spar also..Jerry

This would be a FLAT sawn board rather than a qtr sawn-edge grain- board
which would probably have to be laminated itself to oppose warpage which
you cannot escape in flat sawn wood otherwise.