To ensure safe operation and
efficient performance, it is critical that your engine operates within the
RPM range recommended by the manufacturer. Matching the right prop for the
load is the most significant factor of RPM adjustment.
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Propeller Diameter and Pitch
It is important that you know the size of your propeller. If you
don't know this, you have a couple of ways to determine it's size.
a. Look at the inside of the hub
of the propeller for either a serial number or the propeller size
stamped into the hub. Propeller size is shown as Diameter x Pitch
(ie: 14x19 - 14 is the diameter, 19 is the pitch.)
b. If your propeller has
absolutely no markings, it may be worthwhile to take your
propeller to a propeller shop and have them measure the size.
While you are able to measure diameter, the pitch is the most
crucial piece of information.
Determine Manufacturers Recommended RPM
Find the manufacturer's recommended RPM range in the owner's
manual or ask your dealer.
for Maximum RPM
Using the existing propeller or a new propeller, make test runs
to determine the maximum RPM and boat speed. This is known as
"wide open throttle" (WOT). Vary the trim angle
for optimum performance.
RPM's Higher Than Recommended
If the actual WOT RPM's are above the
recommended RPM range, install the next larger pitch propeller to decrease
your WOT RPM's. Re-test the WOT RPM.
RPM's Lower Than Recommended
If the actual WOT RPM range is below the recommended range,
install the next smaller pitch propeller to increase your WOT
RPM's. Re-test the WOT RPM.
pitch on RPM
A pitch change can
increase or decrease the RPM's and bring RPM's into the
recommended range. A 2" increase in
pitch (for example, from 21" to 23") typically results
in a decrease of approximately 200-400
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