If you make a laminated-plywood spar with the laminations vertical, it will be more susceptible to bending forward-to-back (doing it horizontal makes it so that if there's bending, it's up and down...
Also, for the solid-laminated, bent design (which is pretty heavy and thus not used in the KR - but is found in some Lycoming-powered designs) that poses another problem - you can't bend a vertically laminated spar vertically (due to the above rigidity issue) to achieve your dihedral, as seen in this design (my other project): http://groups.yahoo.com/group/T-40/ On 5/24/2012 9:02 PM, Brian and Sue Deveson wrote: > Now that is a good question. I look forward to comments. > > Brian > Bundaberg > Australia > ----- Original Message ----- > From: "Tony King"<[email protected]> > To: "KRnet"<[email protected]> > Sent: Friday, May 25, 2012 1:05 PM > Subject: KR> Laminating spars > > > I'm about to start laminating the timber to form my centre section > spars from pieces that are 19mm (3/4") thick. Is the orientation of > the laminations significant? I'm not sure why but all the laminated > timber beams I've seen have the lamination layer horizontal. I can do > this but in this case I'd waste less wood if the laminations were > vertical. Does it matter? > > Cheers, > > Tony King > > _______________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html > > _______________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html
