Originally Posted by AD28
Call Geoff Prior at AB Marine, 401-847-7960
AB Marine is the US Gori dealer. He will probably try to sell you another propeller
but he's been good to answer questions nevertheless
I've dealt with Geoff and crew at AB Marine regarding an Autoprop which I bought used and into which I installed their rebuild
kit (bearings and races). They are very informative. Replacing the 2 blade
fixed with the 3 blade
Autoprop made a huge difference . As each blade rotates independently from each other on races of ball bearings, there is no banging and clanging underway, or when shifting forward to reverse etc. Additionally, the prop blades rotate w the motion of the boat, yielding the most efficient profile for demand. In a chop and hitting wakes, I suffer far, far less deceleration than in the past. Sailing I've picked up close to 1/2 knot
. It would be more had I been equipped w a 3 blade
fixed. In reverse, the prop has the exact same configuration as in forward, providing plenty of stopping power.
My top speed powering at full rpms is hull speed
+ a little more,,, maybe 0.2 knots, but in the mid-range of rpms I achieve same speeds at 2-300 less rpms. That's where you see the difference. Fuel
efficiency on my CAL
35 (14000lbs) (Yanmar 3HM35F, 30 hp) at 2000 rpms is ~ 0.7g/hr. making 6-6.2 kts. At the recommended 1800 rpms, closer to 0.5g/ hr.