2-5
PROPELLER SPECIFICATIONS
DUAL THRUST
This is designed for sailboat or other large dis-
placement boats.
This redirects the exhaust gases so that the
blades cut through “clean” water, for higher
efficiency.
PROPELLER IDENTIFICATION
The propeller identification of the size is indi-
cated as follows.
Diameter: Diameter of propeller rotating circle.
Pitch: Logical advancing distance when
propeller rotated one time.
The location of the propeller identification var-
ies.
Refer to the illustration as shown.
Example:
(1) 7-1/4 X 6 - BS
(2) 21 - ML (Pitch - Mark)
(3) 13 X 17 - K2
(4) 19K (Pitch and Mark)
(5) 9-1/4 X 9 - J
* Calculation formula of the logical boat speed is as
below.
^ Boat speed (km/h) = propeller pitch (inch) X
engine speed (r/min) X 0.001524 X propeller
efficiency / gear ratio.
^ Propeller efficiency = Actual advancing dis-
tance when propeller rotated one time / Logical
advancing distance when propeller rotated one
time.
Propeller
identification
=
Diameter
(inch)
X
Pitch
(inch)
–Mark
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