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Author	Topic:   Selecting a Prop
boatlover15	posted 04-24-2006 08:59 PM ET (US)         When picking a propeller, what does one look for? Does a higher pitch get you a higher top end? Does it give you an increase in RPM's which cuases a bigger top end? I have to say I am confused on the matter and would like some info on it. Thanks, John
Sal DiMercurio	posted 04-24-2006 10:48 PM ET (US)             John, You will only get more speed if your engine can twist the prop with more pitch in it. More pitch means "LESS" rpms. For instance, if your running a 14.25 diameter x 17 pitch prop, & your engine "maximum rated" rpms is 5600 rpms & your getting 5600 rpms @ wot, you can't put a 14.25 x 19p prop on, because you will loose 400 more rpms because of the added 2" of pitch [ from a 17p to a 19p ]. 2" of pitch added means 200 rpms less for each inch of pitch, so that would make 400 rpms off your top end & drop your maximum rpms to only 5200 rpms. Now, if you go down in pitch from a 19p to a 17p, you will gain 400 rpms. It's 200 rpms per inch of pitch, more pitch means less rpms & less pitch means more rpms. Sal
jimh	posted 04-25-2006 07:51 PM ET (US)             Read: http://continuouswave.com/whaler/reference/prop.html

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