Don,
It might be better to install "butterfly" blocks between the spar caps
at the attach point with the steel fuselage (similar to the landing gear
attach blocks seen on Lynn Hyder's KR2--
http://home.hiwaay.net/~langford/lhyder/)--
one 1/2 " bolt through the block and an attach fitting welded at each
side of the fuselage for the main spar and smaller bolts for the rear
spar. The block would also even out the stresses at the fuselage
juncture. Check out Falconar or Jodel plans--they have wood fuselages,
but I believe they only use bolts to attach the wing spar to the
fuselage.
An alternative would be to box in the spar with the steel of the
fuselage sides and require only small bolts through the "butterfly" block
to hold it in place.
Dick H
