It is the -20. I appreciate your views on the CF gear, but I already have a mold I made when I was working on a 2m glow back in '04 when I dropped out. I had (still have in fact) a Webra 1.45 that swung an 18" prop, so I will try to use those. If it doesn't work I have a lot of experience working with 6061. I will probably wind up with several 17"-18" props to try out to see what works for me.

Thanks for the input.