I just finished riveting my rear spars and getting ready to re-assemble and rivet the main spars.
I hate to ask questions that highlight my lack of knowledge...but here goes: regarding the wing strut attach strap fittings that bolt onto the spar, the plans call for 0.190 thick 4130 N steel. Does the N stand for 'normalized' as opposed to 'annealed'? Does Wicks and/or Aircraft Spruce provide 4130 N steel?
As a follow-up question to the type and source of the appropriate steel to make these parts...would it make more sense to just buy these ready-made parts form Mark for ~$120 ?
Also, how hard is it to accurately match drill 1/4-inch holes through the steel straps into the thick stack of aluminum at the splice.
I hate to ask questions that highlight my lack of knowledge...but here goes: regarding the wing strut attach strap fittings that bolt onto the spar, the plans call for 0.190 thick 4130 N steel. Does the N stand for 'normalized' as opposed to 'annealed'? Does Wicks and/or Aircraft Spruce provide 4130 N steel?
As a follow-up question to the type and source of the appropriate steel to make these parts...would it make more sense to just buy these ready-made parts form Mark for ~$120 ?
Also, how hard is it to accurately match drill 1/4-inch holes through the steel straps into the thick stack of aluminum at the splice.
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