Robert Loer wrote:
Plans call for wing spar to fuselage carry through attach fiitings to be
7/8x1/8 4130 steel. Advisability of using 9/16x 3/16 6061-T6 aluminum as I
have it on hand.

Your thoughts please. I have plans for another ship which uses the 6061-T6.


At the maximum design load, how much deflection do you have with each?

What is your factor of safety with each?

If you don't know, don't substitute.

--

FF