This thread goes on and on... Plywood is NOT as strong as spruce in a single direction. Most woods have very little strength crossways of the gain,. This is why plywood will be about 1/2 as strong as spruce in the primary stress direction. If you're gonna DESIGN, look up the strength of the materials.
Ron Freiberger mail to rfreiberger at swfla.rr.com <- substitute an @ sign ;o) -----Original Message----- From: krnet-bounces+rfreiberger=swfla.rr....@mylist.net [mailto:krnet-bounces+rfreiberger=swfla.rr....@mylist.net] On Behalf Of Bubba Sent: Tuesday, February 08, 2005 2:52 PM To: KRnet Subject: Re: KR> To laminate or not ... patrusso wrote: > Not a good idea. Not all the plys are going in the direction you > would want them to for the spar. There are many planes with plywood > spars but they are usually capped with a solid timber. We're not talking about going down to Home Depot and getting a sheet of 1" CDX. All the layers would have the grain running spanwise, but every other one is flipped so any grain angularity is cancelled out. I know that laminated wood is stronger, I've done it myself and seen the results, but I have no idea how to calculate it to put a number to the strength. I know the design, built to plans, is more than strong enough, but I'd really like to put the dihedral break in the middle of the fuselage instead of out in the airstream. -- 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
