Darren, I think I had better chime in on this one as I am one who has done "bent" spars. The main spar is pretty straight forward but you do end up with a curved upper surface inside the fuselage. The rear spar can be tricky to figure out, I actually built mine 2 feet longer to accomadate larger flaps, also tapered planform starting at the root (54" chord") thats what really complicated the rear spar. If I were to do it over, I would either start the forward sweep of the rear spar at the fuselage or build the wing constant chord out to the attach points. The landing gear castings (diehl) were also a little tricky because my spar is taller due to increased chord and they end up sitting at an angle to the spar due to the dihederal starting at the fuselage. As I have said before one change from the plans creates ten more problems to work out in the future. Also I would reccomend getting an opinion from an engineer before you make changes to the basic structure. I don't think you can bend the wood in the wide direction to sweep the rear spar forward, you would probably need some kind of scarf joint in the center, ...again talk with engineer. Just my 2 cents. Riley Collins KR2-SS Lycoming Rutledge, TN
---- Darren Crompton <kr.2s.dar...@gmail.com> wrote: > Thanks for everyone's input on my previous post "Spruce vs Douglas Fir". I > have decided to build with Australian hoop pine. > > That decision made, I have been taking a closer look at the plans regarding > the timber I need to order. I will be using the laminated bent spar and as > described in Mark Langford's site regarding its use > http://home.hiwaay.net/~langford/kopinion.html , I like the idea of > extending the flaps beyond the stub wing. If I am to taper the the spars > from root to tip in a straight line, also doing away with the duplicate wing > root template on the end of the stub wing, do I have to bend the laminated > rear spar forward at the root so the two meet at the tip 15" apart as per > the plans? If so, how do I bend the 1/4" x 2" laminations about the 2" > width? > > Cheers > Darren Crompton > AUSTRALIA > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > Post photos, introductions, and For Sale items to > http://www.kr2forum.com/phpBB2/index.php > please see other KRnet info at http://www.krnet.org/info.html
