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How do you calculate what size prop you need

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i have a 55ft steel narrowboa

i have a 55ft steel narrowboat with a ford transit diesel engine how do i go about working out the prop size?
 
"Selecting the proper propelle

"Selecting the proper propeller can be complicated. Some Naval Architects specialize in it and still resort to a certain amount of trial and error.

You can start by trying to find similar boat/engine combinations and see what they use.

There is a good book that has been around for a while:

The Propeller Handbook: The Complete Reference for Choosing, Installing, and Understanding Boat Propellers by David Gerr



It is technical enough to be valuable without being overwhelming to non-professionals.

Regards,
Andrew"
 
I have a Regal boat 22.5 ft l

I have a Regal boat 22.5 ft lenght model 6.8 Ventura with a Mercruiser engine 5.0 and Alpha One gear. I want to know what tipe of propeller do I have to use 19 or 21 pitch ??
 
As a rule ..try a prop..borro

As a rule ..try a prop..borrow one ..them check engin revs..every inch of pitch will take about 200 rpm from engine
 
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