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Propeller performance...arghhh!!:(

 
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pke94



Joined: 11 Jul 2008
Posts: 2

PostPosted: Thu Jul 17, 2008 10:38 am    Post subject: Propeller performance...arghhh!!:( Reply with quote

Hello all. I'm a long-time lurker and first time poster.
hopefully I can get some help as i am in quite a bind. I just spent a bunch of money on two new propellers and they seem to have slowed my boat down by about 10 knots. I am currently running twin v6 4.3 liter mercruisers to bravo 2's.
My local propeller shop told me my current propellers were 18.25" by 19 degree pitch and were unrepairable. He said I should achieve 250 more rpms for every deg. of pitch I go down....(I was full throttle max at about 4200 rpm) so, he set me up with a 18.75" 17 degree pitch propeller. these props are cupped as my last ones were (im not sure as to how much cup variance though ..make a difference?)They are also alluminum as my last ones. I should have achieved higher rpms but I am revving the same if not a bit less than before and my boat is sluggish as all hell!!

Please someone help!
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MikeW
Senior Member


Joined: 01 May 2006
Posts: 680

PostPosted: Thu Jul 17, 2008 1:39 pm    Post subject: Propeller performance...arghhh!!:( Reply with quote

There can be a difference from one manufarture to another. Are the new props the same brand as the original props? Can you get the numbers off the original props?
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pke94



Joined: 11 Jul 2008
Posts: 2

PostPosted: Thu Jul 17, 2008 2:33 pm    Post subject: Re: Propeller performance...arghhh!!:( Reply with quote

MikeW wrote:
There can be a difference from one manufarture to another. Are the new props the same brand as the original props? Can you get the numbers off the original props?


Mike,

they are different. One is an original from mercruiser, the new ones are from a company in Georgia called propco. It is their own brand.
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