Wing Spar Hat Stiffeners

Posted on September 6, 2008September 18, 2008 by Glenn

The hat stiffeners for the spar webs proved to be quite a task for such a small item. The difficulty was getting the multiple bends done. It involved a number of processes including making various jigs and spacers, then a fair bit of finishing to get the angles right.

See photos.

4"X2" pine screwed to brake base with coach screws ready to cramp material before bending.

Timber ripped and screwed together sandwiching the stiffener which has already been bent to 90 degrees.

Ready for first of the 45 deg. bends

Bending- note extra cramps to minimize slipping

Out of the jig after the first bend. The second bend was done with a 3/4" spacer on the brake.

After both 45s were done, I cramped the pieces to the brake and adjusted the angles

5.5 Hours.