View Single Post
Old 01-19-2016, 05:22 AM   #17
psneeld
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,149
Like ballast...it depends.


So far the biggest reason I have heard is loading and limited by diameter.


I have never heard that 4 bladed in backing were a big deal. The efficiency of fewer blades is usually noticed up the rpm/load range I thought...so if anything...the 4 and greater numbers may be more efficient. Smaller outboard boats I thought used 4 plus blades for "hole shots".....immediate max thrusting...so that would lead me to believe more thrust at lower rpm....not up the rpm chart.
psneeld is offline   Reply With Quote