Cyclone Build Part 5 Spar Contour

When sandwiched together, the spar is 3/16" thick.

While it could have been glued to the body tube as is, I wanted a better root edge fit on the BT-20.

I wrapped 220 grit sandpaper around a BT-5 tube and sanded the body tube curve into the wide root edge.

TIP: Notice I didn't sand around a BT-20. You'll get a tighter contour fit by sanding over a smaller diameter tube. The BT-5 is the next smallest diameter.

Here's the curvature of the root edge back on the BT-20 upper tube.