I was driving down the highway and saw an sailplane on a trailer with and interesting spar carrythrough. The two spars (left and right) appeared to join via two very large tapperd pins projecting from the end of the spar that fit in a corresponding fitting on the opposite spar. Just outboard of the pin fitting on each spar half was a hardpoint for a through bolt to attach to the fuselage. So it looks like all the bending loads are transmitted by the pins and the bolts only took the loads from fuselage weight. Seems like an interesting way of doing it, but I would think that the pins would be suseptible to fatigue as they are subject to repeated bending. I would also think that if the cross bolts were used for both bending and fuselage weight loads (sized accordingly of course) that the resulting attachment would weigh less.
Any thoughts about this?
Dave
Any thoughts about this?
Dave
