If I'm running max about 4600 rpms on a pair of new Alpha MR drives with 21p Laser-II drives. I have thru hull exhaust with a pair of built up 302's.
The boat leaps on plane even though a heavy 25ft boat.
Question I have, If the max HP can be reached in the 5000rpm range. Should I pitch down to 19's...? Initial thought would be the obvious, going to 19's I loose speed but pick up RPM or is it a wash with no real gain.
If I hit the gas hard on the 21's I can cavitate the props a bit once I bolted on the alum. heads.
OR is this where lab finishing props come in? Or 4 blade Mirage props. Any thoughts?