real power

[weaselnot]

What is the actual power loss thru the foot of any given outboard, or IO?
In automotive applications it runs about 15%.
I have a 1973 65hp where is it rated from? Flywheel or Prop

 

[Dave1027]

Re: real power

Crankshaft. Merc switched to rating at the propshaft sometime in the early '80s.