View Single Post
Old 11-08-2018, 07:06 PM   #2
mcarthur
Senior Member
 
mcarthur's Avatar
 
City: Canberra
Vessel Name: Blu Emu
Vessel Model: Ligure 50' aluminium power catamaran
Join Date: May 2018
Posts: 297
I always assumed a law of diminishing returns - 2 blade to 3 blade to 4 blade+ - and that the sweet spot for non-electric trawlers was 3 or 4 blade.

I class electric differently due to the ability have usable torque at any rpm from 1 upwards, and trawlers differently due to speed.

There seems to be many trawlers who cruise at 6-8kn but have a possible top speed of 14+, and would seem to benefit from two entirely different props to maximise both options. Since that may be changing pitch and number of blades, I have no idea how one could do it !
mcarthur is offline   Reply With Quote