Original Posted By: Warren Shoun
Just a short note to ask a question. If you use 1/2" spruce for the spars,and using 1/4" wood strips for the top and bottom caps, can the top andbottom caps be 1/4" aviation grade plywood instead of spruce or equivalentwood?Craig________________________________________________________________________________
Pietenpol-List: SPAR CAPS
Pietenpol-List: SPAR CAPS
Original Posted By: steve(at)byu.edu
Just a short note to ask a question. If you use 1/2" spruce for the spars,and using 1/4" wood strips for the top and bottom caps, can the top andbottom caps be 1/4" aviation grade plywood instead of spruce or equivalentwood?CraigJust a short note to ask a question. If you use 1/2spruce forthe spars, and using 1/4 wood strips for the top and bottomcaps,can the top and bottom caps be 1/4 aviation grade plywood insteadofspruce or equivalent wood?Craig________________________________________________________________________________
Just a short note to ask a question. If you use 1/2" spruce for the spars,and using 1/4" wood strips for the top and bottom caps, can the top andbottom caps be 1/4" aviation grade plywood instead of spruce or equivalentwood?CraigJust a short note to ask a question. If you use 1/2spruce forthe spars, and using 1/4 wood strips for the top and bottomcaps,can the top and bottom caps be 1/4 aviation grade plywood insteadofspruce or equivalent wood?Craig________________________________________________________________________________
Pietenpol-List: Re: SPAR CAPS
Original Posted By: Craig & Shari Hanson
"I" beam spars are usually made up with a plywood web & wood caps -- on thespar you describe the ply may be 1/4" thick, but 1/2 of the plys arerunning cross grain to the spar. You'll end up with a spar that is onlyequal in strength to a 1/2" wide spar.Mike C.PP, KS________________________________________________________________________________
"I" beam spars are usually made up with a plywood web & wood caps -- on thespar you describe the ply may be 1/4" thick, but 1/2 of the plys arerunning cross grain to the spar. You'll end up with a spar that is onlyequal in strength to a 1/2" wide spar.Mike C.PP, KS________________________________________________________________________________
Pietenpol-List: Re: SPAR CAPS
Original Posted By:> Craig & Shari Hanson
Craig,Michael is correct on this. Consider going to your nearby lumber yard thatsells contractors I beam floor joists. They normally have samples and loadcarrying tables that they will give you or at least let you fondle. You willget some first hand views of grain orientation and strength comparisons. Yourfamily probably thinks that you are worth the $100.00 that doing this right isgoing to cost you...{8 )Best Regards.WarrenMichael Conkling wrote:> "I" beam spars are usually made up with a plywood web & wood caps -- on the> spar you describe the ply may be 1/4" thick, but 1/2 of the plys are> running cross grain to the spar. You'll end up with a spar that is only> equal in strength to a 1/2" wide spar.>> Mike C.> PP, KS>> ----------
Craig,Michael is correct on this. Consider going to your nearby lumber yard thatsells contractors I beam floor joists. They normally have samples and loadcarrying tables that they will give you or at least let you fondle. You willget some first hand views of grain orientation and strength comparisons. Yourfamily probably thinks that you are worth the $100.00 that doing this right isgoing to cost you...{8 )Best Regards.WarrenMichael Conkling wrote:> "I" beam spars are usually made up with a plywood web & wood caps -- on the> spar you describe the ply may be 1/4" thick, but 1/2 of the plys are> running cross grain to the spar. You'll end up with a spar that is only> equal in strength to a 1/2" wide spar.>> Mike C.> PP, KS>> ----------
> SPAR CAPS
Original Posted By: Ken Beanlands
>> Just a short note to ask a question. If you use 1/2" spruce for the spars,> and using 1/4" wood strips for the top and bottom caps, can the top and> bottom caps be 1/4" aviation grade plywood instead of spruce or equivalent> wood?>> Craig________________________________________________________________________________
>> Just a short note to ask a question. If you use 1/2" spruce for the spars,> and using 1/4" wood strips for the top and bottom caps, can the top and> bottom caps be 1/4" aviation grade plywood instead of spruce or equivalent> wood?>> Craig________________________________________________________________________________