I checked out your blog and I think we've actually been in contact before. I also converted from gas to diesel
and went with the Ford Lehmans. I've put well over a 1000 NM under the keel
with them over the past 5 yrs and they have proven to push the old girl just fine through heavy weather
, etc. I can push her at 6.5 kts at 1500 RPM
and burn 2.8 gph doing it with the genset running. That is a comfortable cruise
speed. The engines start to load at 1400 and are happiest between 1500 and 1800 rpm
I've been buddy boating
with 2 stick boat
friends who in calm water
kept pace motoring at 6kts until we ran into weather
conditions that knocked them down to 1.5 (Island Packet)and 4 kts (Islander freeport motor
sailor) respectively. I kept chugging along at 6 kts with a 100 rpm increase in throttle - 1600 rpm vs 1500.
I'm curious as to the conditions you ran into that caused you concern? For the record
, I'm turning 1.91:1 velvet drives and 23x16 4 bladed wheels. According to the calculations, I should be able to put another inch of pitch
in the props, but I'm happy with the performance I have.
My old girl is heavy - over 55,000 lbs. When I hauled last spring for a bottom job, my primary fuel storage tanks
were empty and the yard's newly rebuilt hydraulic trailer
that is rated to 50,000 lbs couldn't budge the old girl. I warned them she was heavy and they thought my weight estimate was insanely high. After they tried moving her, they agreed with my estimate. That same trailer
had just moved 40+ ft Kady Krogen.
Anyway, she is a comfortable liveaboard
and handles well at sea (as well as can be expected for a coastal cruiser).