how far should the prop be under the boat

busted-bayliner

Petty Officer 1st Class
Joined
Jun 6, 2010
Messages
228
i have a 18 foot critchfield boat with a 1974 70 hp johnson outboard the prop i just got this boat the prop looks like it hangs very low it the original prob that came on the motor can post a pic in a few can anyone help??? i can lift the motor an reset it has a few holes for doing that any help is apreciated
 

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: how far should the prop be under the boat

You will start with the AV plate (plate right above the prop) even or slightly above the keel when the plate is parallel to the keel. Never below. How high above depends on the technology level of a given prop and how it reacts to your particular hull design.
 

busted-bayliner

Petty Officer 1st Class
Joined
Jun 6, 2010
Messages
228
Re: how far should the prop be under the boat

and another of the prop size

IMG-20120529-00087.jpg
the last number is 17
 

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: how far should the prop be under the boat

Looks a bit low......
 
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