going from 22 to 23 pitch prop, how much faster?
#1
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I have an 18' donzi with a SBC and Merc TRS drive.
I have a 22" trued, Michigan Wheel "Rapture" 22P.
If I go to a 23P or a 24P, Rapture, how much faster can I expect the boat to go with each additional inch of pitch? Currently running 58 mph on speedo, with lots of drive trim, w mild chine walk, 60 MPH with significant chine walk.
Incidentally, when I went from a 19P to 21P cleaver, and then to the 22P Rapture, I didn't loose any RPMs, this is w a flat tappet, solid lifter, mild Crower cam still turning 5000 RPM with all three of these props.
Your opinions please.
Thanks
Evan
I have a 22" trued, Michigan Wheel "Rapture" 22P.
If I go to a 23P or a 24P, Rapture, how much faster can I expect the boat to go with each additional inch of pitch? Currently running 58 mph on speedo, with lots of drive trim, w mild chine walk, 60 MPH with significant chine walk.
Incidentally, when I went from a 19P to 21P cleaver, and then to the 22P Rapture, I didn't loose any RPMs, this is w a flat tappet, solid lifter, mild Crower cam still turning 5000 RPM with all three of these props.
Your opinions please.
Thanks
Evan
#2
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At what RPM is your peak HP produced? This will determine the pitch you need to run. If you are hitting the same RPM with all props I suspect you are in the Rev limiter with all of them. Where is your Rev set?
Julie
Julie
Last edited by throttleup; 10-31-2005 at 12:38 PM.
#5
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As a general rule each inch of pitch turning the same rpm, same model prop results in a speed difference of about 2.5-3 mph.
Matt
Matt
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