Originally Posted by
iron eagel
Chuck I am toying with of the idea of doing one sans fin or winglets using that prandtl stuff Dryden FRC has been playing with.
degrees of twist = 12X the AOI at cl (at cruise speed) 1/4 span to the tip twist center at 1/4 cord. If I understand it correctly.
This idea is supposed to reduce drag by 17%
You could cut out a sheet metal pattern, clamp off the portion that you don't want to twist, then clamp wood handles across the ends of the sheet metal pattern to use as levers and crank in the proper amount of twist.
Once you are happy, tape off the metal or cover it with iron on film and build a foam core wing right on top of the sheet metal form.
The form should be trussed in a jig to lock in it's shape.