>From the FAA A.C. 43.13 (You have read the FAA bible, havn't you?): 1-43. REPLACING SOLID TYPE SPARS WITH LAMINATED TYPE SPARS Solid spars may be replaced with laminated spars or vice versa, provided the material is of the same high quality.
There is also supposedly excellent book on wood aircraft design and construction that someone mentioned a while back (Don Reid?). Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Bubba Sent: Tuesday, February 08, 2005 8:01 AM To: KRnet Subject: Re: KR> To laminate or not ... Stephen Jacobs wrote: > > I also believe this - so here is a question for the knowledgeable > among us: > > How about making up wing spar caps out of several laminations of ply? > As we are taught, a good scarf makes for any length you like without > any strength compromise. > > 8 x 1/4" laminations would make up the correct depth (for a 2" spar > cap) and work just fine for the bent spar. > > Using 5 ply must surely result in a bullet proof spar? If we can collectively prove to me that this would be structurally sound I'll build it that way. I'd rather have the dihedral be set at the centerline than at the end of the stub wings. I know it's strong enough, but I still want solid proof of it. Laminating the longerons would make life a lot easier, too. No more trying to find 14 foot pieces. Just scarf 8 foot pieces together to make pieces as long as you need, staggering the joints, and laminate it all together. -- Steve N205FT mystic...@swbell.net He who seeks will find, and he who knocks will be let in. _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
