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Old Oct 03, 2011, 02:37 PM
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United States, MD, Kensington
Joined Dec 2008
324 Posts
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Deb spar question

Yardsticks are a little scarce lately. I'm thinking of using a single pine lattice spar. The lattice is straight grained, and 1/4" by 1-1/8". I'll be building a RNAFwing. Will the spar be strong enough?
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Old Oct 03, 2011, 06:25 PM
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draftman1's Avatar
central CA
Joined Aug 2002
347 Posts
yeah, it should be, I use a hardwood like birch and rip it down on the table saw.

if you have an ACE hardware store, they have or can get them
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Old Oct 03, 2011, 11:40 PM
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LaGrange, GA
Joined Jun 2009
1,817 Posts
I use those old finger-jointed yard sticks that Walmart sells and have never had one separate. BUT..... I don't do all kind of maneuvers like most folks do. On a Deb trainer you should be ok. I *do* put a shot of thin CA on the finger joints on the yardsticks to help stick them together. I bet if you ran a bead of thin CA down the length of your yardstick and just let it soak in, the CA sticking the fibers together plus the torsion/tension or whatever it's called that the engineers in the group speak of that the gluing of the spar to the wing skin....... you'll be ok on a Deb whatever maneuvers you decide to do. And if the spar snaps, chop the throttle, drop it on in, repair whatever happens and give it another go.
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Old Oct 13, 2011, 11:29 AM
jib
Chief Mechanic for my son
Covington, WA
Joined Oct 2008
377 Posts
I've covered one side of a yardstick with light fiberglass cloth and epoxy. Stong and not too heavy. Sand the edges to clean it all up, so the glass is only on the side.

Jack
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