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The most Frequently Asked Question
is about Propeller Size...
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| The first and most
important thing you need to find is your engine manual. In there you will
find a section that will say "this engine has a Maximum HP at some
RPM." You must be able to reach that RPM at full throttle
in your boat. |
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If you cannot get
all the required RPM your prop is too big; if you go over
the required RPM your prop is too small. By knowing the number of RPM you
are under or over the required value, you can have your prop adjusted. You
can alter your inboard prop two or three inches in pitch up or down as long
as it is made of bronze. |
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| Sizing is an easy process if
your boat is put together and running. If you are building or repowering
the prop may need to be sized by computer. If you are repowering and the
max RPM is not too much different from your old engine and the gear reduction
is the same, your old prop will probably work. |
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If the RPM or gear
reduction changes your old prop will be less likely to work well for you.
The most important determining factor for propeller sizing is not speed,
but RPM! |
