Bob Hoover wrote: > Question: Is 1-1/2" the normal thickness for these booms?
The KR main spar caps for the center section are usually 2" thick (top to bottom) and 2-5/32" wide with vertical spacer blocks every 7-9", faced with 3/32" plywood. The whole thing is about 7.2" tall. The outboard wings are a quarter inch thinner at the root (so the wing attach fittings can nest), and tapered towards the tip (down to about 1" wide front to back, about 5/8" thick), and are faced by 3/32" thick plywood, along with spacer blocks every 5". 307" is about 25.5 feet, so I sure hope he's done his homework on this... Mark Langford, Huntsville, AL N56ML "at" hiwaay.net see KR2S project at http://home.hiwaay.net/~langford
