Original Posted By: Rcaprd(at)aol.com
Thanks Mike,You got me to remembering my copies of "Stress without Tears"and in it the author mentions the book by Bruhn to be almostas rare as hen's teeth nowadays.The "C" spar might be good, but a built up "I" beam would bebetter still. Only instead of routing the slot, glue spar caps toeach side of the web, top and bottom.To help visualize my description, if the spar web is 5" tall (and 1/2" wide), it would have spar caps of, say, 3/4" wide by 1" tall glued each side, top and bottom. This would give greater glue area for strength. Basically this is what Bernie achieved by routing the 1" wide solid wood spars.The "Stress without Tears" articles ran in the May 1986 thru November 1989 issues of Kitplanes and is very well writtenso that you can follow without falling asleep. The designer'sjob is more complicated than I thought.RodgerPiet in progress________________________________________________________________________________