>Netters, > Awhile back someone posted a message on his seat belt attachment. It >was an angle bracket made with 4130 steel that was bolted to the rear spar >using two bolts through the solid parts of the spar. > could these brackets be made out of 6061-T6 Alum? >If so what thickness angle alum. would be best. >Jim Morehead >++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
You may be thinking of the following: http://home.hiwaay.net/~langford/flesner/fittings.jpg As for alum or not I'll let an engineer type answer that but if you are considering 1/4" alum, you may as well use a thinner steel. The weight savings would be very small if any. As for using fittings at all instead of attaching directly to the spar, the fittings move the attach point forward a bit to help hold you down as well as back. If the attach point is too far behind the point where the belt crosses you lap you won't get a very good vertical restraint. Just my "non-engineered" opinion. Larry Flesner
