For years, I always wanted some sanding jigs to help me get good airfoils on fins. Eventually I made some jigs that help me get good, consistent airfoils on balsa, plywood and G10 fins. Each block has grooves designed for leading and trailing edges (although rounding both using the leading edge groove is common for sport models and NCR kits).
Here’s what each block was designed for:
* Small - 1/32" plywood and 0.030" to 0.0625" G10
* Medium - 1/16" to 3/32" balsa and plywood
* Large - 1/8" to 1/4" balsa and plywood