These are the start of my
main gear brackets. They are 1/4" x 3" 4130 plate heated and
bent to a 90 degree angle.
.
I welded 1/8" 4130 plate as
sides to it and a 2" wide stiffener across the third side of the angle.
There were five 3/8" holes drilled into the bracket. One at the top spar
cap, Two at the bottom spar cap, and two on the bottom of the "L" to fit
the radius blocks that the main gear actually bolt to.
The brackets were mounted
to the rear face of the main spar with three 3/8" bolts.