On the left is a before and after pic of the fin airfoil.
On the right is the rotor blade airfoil (one side flat or chambered) before and after.
The fins are smaller so the airfoil was sanded using a sanding block.
The rotor blade is 10 inches long so a consistent airfoil could be hard to do.
I used the emery board featured in an earlier post, HERE.
TIP: For support, place the trailing edge of the blade near the edge of a hardcover book. Set the emery board over the trailing edge at a slight angle on top of the balsa blade. Sand down the entire length of the rotor blade.
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