Larry, I would suggest 1/4" bolts instead of 3/16ths. to attach the belt brackets to the spar. I would suggest the same for attaching the belt to the bracket. You do the P/A with a 180 ksi bolt. = 8800 lbs. Ultimate Load. Tension load application, so 8800/1.5 gives you 5867 lbs Limit load. You're using 2 bolts per attachment so assume 1 bolt would carry 60% of the load, or 3520 lbs. Compare that to the 7 G loading 200 lb pilot and a 150 passenger at 7g's plus 1.5 design load= 3675 lbs /4= 919 lbs per attachment. With a 1/4" diameter bolt those brackets attachments are good for about 26 G's (conservative-rough estimate). There are a bunch of ways that you could figure this, in fact you could take the entire load onto one bolt which roughly gives you amount good for 19 G's. --- larry flesner <fles...@midwest.net> wrote:
Use your best judgement there. The attach bolts are 3/16" top and bottom with, I think, a "wood washer" backing plate. I suspect the spar will have to go to pieces before these brackets turn me loose. ===== Scott Cable KR-2S # 735 Wright City, MO s2cab...@yahoo.com __________________________________ Do you Yahoo!? Free Pop-Up Blocker - Get it now http://companion.yahoo.com/
