have two basic dimensions; diameter &
pitch. Diameter is the distance measured
across the propeller hub line from the
outer edge of the circle that is made
by the propeller's blades during rotation.
Pitch is the distance that a boat will
travel if rotated one revolution without
any slippage. When describing a propeller
both the diameter and pitch are given.
The diameter is referenced first and the
pitch is second. Therefore, a 12"
x 9" propeller would have a 12-inch
diameter and a 9-inch blade pitch.
a propeller with a 14-inch pitch, when
rotated one full turn, would advance a
boat 14 inches through the water. In reality,
no 14-inch pitch blade will advance a
boat 14 inches with one full turn. This
variance is referred to as slippage.
general, changing to a higher pitch prop
will increase your top-end speed but reduce
your acceleration (reduce your "hole-shot"
power). On the other hand, decreasing
the pitch will increase your hole-shot
but sacrifice some of your top-end speed.
If the hole-shot speed is important to
you, for example if you pull water skiers
most of the time, then you would want
to go with a lower pitch prop and sacrifice
some of your top-end speed but increase
your hole-shot speed to get the skiers
NO CIRCUMSTANCES SHOULD YOU EVER USE A
PROP WHICH WILL ALLOW YOUR OUTBOARD TO
OPERATE ABOVE THE OUTBOARD'S RECOMMENDED
propeller selection chart can be used
to help you in selecting the correct propeller
for your Nissan outboard. Remember that
in any application, discrepancies in performance
can result due to the different boat hull
designs, the final carrying load and your
It is highly recommended that the outboard
be checked with a tachometer to ensure
that the engine is operating within the
correct MAXIMUM RPM RANGE.
Here to See the Nissan Propeller Chart