Zenoah G231PUM Owner's Service Manual page 5

4. Propeller, Rotor & Screw Propeller
4.1
Propeller for airplane
The recommended prop sizes are as shown in the table bellow.
Diameter x Pitch ( in.)
18 x 6 ~ 10, 16 x 8 ~ 12
Be sure to use a propeller which makes the engine speed approximately
7,000~8,500 rpm while the airplane is flying.
CAUTION
When mounting the spinner, set a pin on the hub with more than 3mm of
diameter, thus preventing slipping.
4.2
Rotor for helicopter
• Adjust the rotor-pitch to obtain 9,000~10,500 rpm of the engine at full throttle
operation.
• Make sure to use the rotor which is recommended by helicopter manufacturer.
4.3
Screw Propeller for boat
The exhaust system (e.g., muffler) is not equipped with as standard. When you
select the exhaust system for the engine, check how many the engine speed (rpm) is
required when the maximum output is generated by using the muffler you select.
And then decide the appropriate the screw propeller that would meet such engine
speed (rpm) that the muffler required.
In general, standard size of the screw propeller (Surface prop type) are as follows:
Diameter ( mm )
65 ~ 75
Pitch ratio ( mm )
1.9 ~ 1.4
5