expedition2166
Well-Known Member
im builidng a knock off of a fly baby bipe i been useing what i was told/read would be an acceptable wood but i recently found something i now have questions about the wood im useing is a non certified northern white pine , i strength tested it against a piece of stikas spruce and it actually did better against breaking. im useing the white pine through out the aircraft and have gotten 70 percent complete . but heres the problem as i just recently discovered the graining is 6 rings per inch as per regulation of certified wood since the 43-13 was not to explanitory of acceptable graining etc i followed the rules to the best of my and my a&p/ia mech boss ability ,long straight grain no knots very little deveation etc but it only has 6 grains in a 1x4 stick since we localy lost a pilot in a citabra due to a broken spar it kinda makes me want more thoughts on it besides my own the wingspars are a c channel with 1/4 90 deg ply (which is also non certified ) but they have 2 fly wires for front spar and 2 for the rear spar the lenth is only 8 ft per side anyone have any thoughts on the matter