Propeller Selection - Mercury 135 Verado Manual

INSTALLATION

Propeller Selection

For best all around performance from your outboard/boat
combination, select a propeller that allows the engine to operate
in the upper half of the recommended full throttle RPM range with
the boat normally loaded (refer to General Information -
Specifications). This RPM range allows for better acceleration
while maintaining maximum boat speed.
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If changing conditions cause the RPM to drop below the
recommended range, such as warmer, more humid weather,
operation at higher elevations, increased boat load, or a dirty boat
bottom/gearcase, a propeller change or cleaning may be required
to maintain performance and ensure the outboards durability.
Check full-throttle RPM, using an accurate tachometer, with the
engine trimmed out to a balanced-steering condition (steering
effort equal in both directions) without causing the propeller to
break loose.
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