There are lots of posts here regarding the Catto props. Do a search using only "Catto" and you'll get a lot of useful info. So far, my only experience is with ordering one and waiting for the call from Craig to let me know it's ready.
I will need to add some weight to the front with the spacers and crush plate, but I'm going to try it out without ASAP.
I put 5/8" spools between my engine mount and the firewall moving everything 5/8" farther forward. Should put me in the c/g sweet spot.Try a Landoll ring. I installed one on my 6A with Catto 3 blade and it really made a difference in both CG and smoother idle.
YMMV
I put 5/8" spools between my engine mount and the firewall moving everything 5/8" farther forward. Should put me in the c/g sweet spot.
Steve Eberhart
RV-7A, O-360-A1A, Catto 3 bld., slider