I have a 10.5' Avon RIB (inflatable,glass hull)thats carrying about 550lbs(people and gear) it is rated for a 15hp and up to 1200lbs.
We have a 1975 Johnson 15 that runs great but will not plane us off.I can get a 2002 yamahha 4 stroke 15 but I have received different opinions about this helping anything.I have also considered a yamaha 25 hp 2 stroke(one of the smaller 25's I have found)
So would the yamaha 15 help anything ? could I use a larger prop on the 4 stroke and help ? Can you get more power out of the yamaha 15 ?
How much would trim tabs and or a fin on the motor help ?