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help for select propeller

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sia_1991

Active Member
Joined
Sep 9, 2012
Messages
26
Location
iran, lorestan , khoramabad
hi
i have an engine with 21 hp and 11000 max rpm.now i want to select a prop.
what diameter i need?
what rpm of prop i need?
(sorry i cant speak english very well)
thanks.
 
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