was running a 280, 1.6-1 ratio leg and a 16x16 3 blade prop
got hull speed at roughly 1500 rpm
put a 270, 2.1-1 ratio leg with a 15x17 3 blade prop
got hull speed at roughly 2000 rpm
25% difference
i only care about max thrust to hull speed, 7 mph
by switching to a 4 blade prop, whats the %...