Another way to do this this:
If you have a Harlan-style balsa stripper, you can use it to make repeatably accurate cuts. Start with some rectangular 1/16" ply. Plot the foil, then glue on top. Remove material to the top of the airfoil.
Tape balsa to the base of the stripper, then ride the flat side of the ply against the base. Adjust as necessary and cut the balsa. Now you can move the micrometers down as much as you want, move the bar and the ply form down and slice the rib. It should be exact to the size you wanted.
Don't have a pic of this handy, but it works better than eyeballing it.
Regards.
Mike Kirda
--- In Indoor_Construction_at_yahoogroups.com, Neil Dennis <wombatt@...> wrote:
>
> I made several "jigs" by printing out the simplex airfoil, gluing the
> printout on a piece of "2 x 2" pine, then cutting to the line on the
> bandsaw. I soak a piece of like 1/32" balsa and clamp it in the jig -
> either just let it dry or bake it. For a thicker rib I use 2
> laminations glued with Elmer's. Then just strip the width I want The
> percent I use most is 6%.
>
> IMHO it makes for better ribs than cut ones.
>
> As far as a formula for what % you want, have no help there at all.
>
> wombat
>
Received on Sun Apr 22 2012 - 08:42:00 CEST
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