cobra marty

30' Cobra cat no center sponson similar to chris cat hull and a lot of others. was running lwp bravo one with 30" bravo prop 1.36 ratio and 700 sc 502 and would run 100mph. The propshaft is about 4" above the bottom of the sponsoms with a 2" spacerand anything over 80mph I would lose the speedo and over 90mph it would feel like it wanted to 'paddle wheel' sideways, not enough skeg in the water. Have been rerigging with stock 500efi and stellings box and lowered the engine and drive 5-6" and took out the spacer and hope to be on the water this summer with this new setup. I haven't checked the propshaft location with this new setup in a while. I will use a 26" bravo and will try a maximus later. Might need a 2" shorter lower IMCO unit. Want around 80-85mph with this new setup and more stability.

Airpacker

I guess it all depends on whats hanging on the back. My prop shaft is almost 5 inches above the lowest point on the sponsons.