Joe:
Weather sanding fin bevels or glider wing airfoils one of the best $10.00 bucks i've ever spent was to purchase a piece of 1/2" x 12" x 18" plate glass. i've since picked up a few additional smaller pieces of 1/8" 1/4" and 3/8" to use as spacers to get very straight alignment lines on body tubes. but the main 1/2" piecs is where all my bevel and airfoil sanding is done.
You will also need a roll of 1" double faced masking tape. don't try using the 3m scotch d/f clear tape the adhesive is far to agressive. run a line of tape along an edge of your glass sheet. with another straight edge, I use a square, align the piece to be sanded and press onto the tape. I use 1" x1"x12" balse sanding blocks covered with various grit sandpapers to do the sanding. I've seen some alum T type sanding blocks that seem to be good also. to maintain a consistant angle tape a stop block along the back side of the glass piece after determining the angle you wish to maintain. Sand away in one direction only, do not try to sand with a back and forth stroke...One direction at a time only. you can change your seating direction and reverse your sanding stroke but to keep consistant pressure you can only sand one way or the other at a time. I draw a center ling on the thickness of the wood being worked balsa, bass, even plywood on all 4 sides before beginning. once you've sanded very nearly to the line on one side, use a flat spatula or piece of very thing plastic to carefully seperate the piece from the d/f masking tape. flip the piece over, carefully realign and continue sanding on the opposite side. finish sand with finer grits all the way down to 600grit. Hope this helps.
