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Support Forums/Technical Support Forums/Other Support
Answered
prop
Foxygrandpa2002
asked this on July 07, 2010 13:02
what are the symptoms of a out of pitch prop or a bad prop?
what would cause o prop to get out of pitch?
Comments
The pitch of a propeller is basically just the angle of the blade. If your pitch is too low, then you run the risk of over-reving your engine. If your pitch is too high then you will lug your engine. Your prop pobably hasn't changed pitch unless you have hit something and the prop is badly damaged. What is the motor doing? You probably have a problem within your gearcase or your propeller hub is slipping.
not having any of those issues ihave been asked severak times about a prop being out fo pitch etc i was just wanting to know what the symptoms are or could be for my own knowledge thanks colin for info
You can have an incorrect pitch on your motor, but a prop can't really become "out of pitch". An incorrect pitch will just lead to the over-reving or lugging of an engine. The only way a prop would become out of pitch is through severe damage.
Find the normal top RPM for your motor. Perhaps 5500 to 6200?? Get a portable tach and attach it to a spark plug wire. Make sure it is set for a 2 or 4 stroke as needed. Take the boat out with your normal load. After warm up, run the boat flat out and note the max RPM on the tach. Compare this with the motor spec. If the RPM is up to spec or too high, get to a prop with a bigger bite, if that is a good way to state this. Props have two inportant numbers stamped on them. A diameter and a measure of distance traveled in one RPM. My motor has a 9 1/2 10. The diameter is 9 1/2 inches. With no slip in one revolution it would travel 10 inches. Note: these numbers should be stamped on the prop. Also not every prop would fit every motor. tedmastenbrook@yahoo.com.