what is it?

I picked this up a while back. I thought at the time that it was an old Pickert boat from the 70's. After looking thru some old flying models magazines at Dad's I am not so sure anymore. Any Ideas? I always thought this was a cool looking boat back when I was a kid. One of these days, I'll...

2-4 mill laps then 6 laps racing.. NR .21s

I am making a flywheel and would like to know what the angle of the groove for the starter belt should be?