Westerbeke 21A Instrukcja Instalacji Pobierz pdf (Strona 17)

The type and size of propeller varies with the gear ratio and

must be selected to fit the application, based upon boat tests.

To utilize the full power of the engine and to achieve ideal

loading conditions, use a propeller which will permit the

engine to reach its full rated rpm at full throttle while under a

normal load and while the boat is moving forward through

the water.

The following information is needed to calculate and match a

marine propeller to a boat.

a. The engine output in hp.

b. The maximum rpm of the engine.

c. The reduction of the transmission.

d. The maximum hull speed of the boat.

e. The type of boat and its displacement.

f. The waterline length (LWL).

Most propeller shops now have computer programs that will

analyze all this data and select the propeller choices in

number of blades, diameter and pitch. In-water testing

however, is always the final answer.

For more information on propellers, read The Propeller

Handbook by Gerr published by International Marine

Publishers.

PROPELLER SELECTION

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Westerbeke 21A Instrukcja Instalacji Strona 17