Evening,
I was running a 19" pitch prop and got a red line of 5400 RPMs (Not sustained) @ 40 mph. I would actually get to 40 around 5200, but the last 200 didn't make a difference. From what I can tell the 19" was a factory prop and it was marked 19" clearly.
I didn't have a spare prop so I wanted to drop my RPMs down to the factory specs of around 4600 - 4800 so I upped my prop size to 21". However, now I can't get over 3800 RPMS however I can still get the 40 mphs. I'm not after speed, just a better rpm range to prop.
I know props can vary a bit, but this seem like an excess from each other. I'm wondering if the old prop was "slipping" at top end (though it doesn't feel that way).
I'm leaning on trying a different 19" prop and see where the RPMs lay. Sea Rays web site recommends a 17" for my boat so I'm a bit confused.
Guess it shows prop changes are more trial and error than "prop calculator".
TF
I was running a 19" pitch prop and got a red line of 5400 RPMs (Not sustained) @ 40 mph. I would actually get to 40 around 5200, but the last 200 didn't make a difference. From what I can tell the 19" was a factory prop and it was marked 19" clearly.
I didn't have a spare prop so I wanted to drop my RPMs down to the factory specs of around 4600 - 4800 so I upped my prop size to 21". However, now I can't get over 3800 RPMS however I can still get the 40 mphs. I'm not after speed, just a better rpm range to prop.
I know props can vary a bit, but this seem like an excess from each other. I'm wondering if the old prop was "slipping" at top end (though it doesn't feel that way).
I'm leaning on trying a different 19" prop and see where the RPMs lay. Sea Rays web site recommends a 17" for my boat so I'm a bit confused.
Guess it shows prop changes are more trial and error than "prop calculator".
TF
