Even pitched props? - Moderated Discussion Areas

  ContinuousWave
  Whaler
  Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  Even pitched props?

search | FAQ | profile | register | author help

Author Topic:   Even pitched props?

Cicada posted 10-13-2002 11:06 AM ET (US)
Does anybody manufacter even pitched props? Currently using a 13/4 X 17 pitch on my 15 sport with a 70hp. When alone or with one passenger the max rpm can be exceeded by about 500 rpm. Good setup for skiing etc. Have tried a 13 X 19 prop and boat is difficult to get up on plane plus won't hit maximum rpm. Seems like an 18 pitch would be a good alternative.
On exceeding rated rpm's. Different references say to set up the motor and prop based on expected typical use. Would this take into account the non-typical use and occasional exceeding of rpm's. How critical is it to stay within operating rpm range on a typical outboard?
Paul
SSCH posted 10-13-2002 10:12 PM ET (US)
You can find even pitch props, but I'd take the one you have to a prop shop and ask them to change the pitch an inch. Often the difference between brands and styles will be more important that the stated pitch. Cup in the blades makes a hugh difference for example. If you leave the cup alone and just have the pitch adjusted, it's fairly easy to predict the result. For changes of two or less inches this will not only save you money, but the shape of the manufactures blades will not be hurt by the adjustment.
Bigshot posted 10-14-2002 10:06 AM ET (US)
I hit 5900+ with a custom 20" SSt on a 15'. You may want to have her tuned up.
Cicada posted 10-15-2002 07:26 PM ET (US)
Thanks for the input. Two different directions to go and both sound good. Motor hasn't been tuned for awhile and should probably check the compression. Even with that will want the pitch adjusted on the prop. Had it reconditioned recently and am thinking that the pitch may have changed in the process.
PM
lhg posted 10-15-2002 07:51 PM ET (US)
Mercury makes even pitched SS props, with interchangeable hubs for any brand of engine, in the 4 1/4" mid range HP gearcase size.
You might want to try an 18" SS Vengeance. Their performance lines of props run 20-26" pitch, with some lower pitch Trophy Plus 4 blades also.

Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.

Author	Topic: Even pitched props?
Cicada	posted 10-13-2002 11:06 AM ET (US) Does anybody manufacter even pitched props? Currently using a 13/4 X 17 pitch on my 15 sport with a 70hp. When alone or with one passenger the max rpm can be exceeded by about 500 rpm. Good setup for skiing etc. Have tried a 13 X 19 prop and boat is difficult to get up on plane plus won't hit maximum rpm. Seems like an 18 pitch would be a good alternative. On exceeding rated rpm's. Different references say to set up the motor and prop based on expected typical use. Would this take into account the non-typical use and occasional exceeding of rpm's. How critical is it to stay within operating rpm range on a typical outboard? Paul
SSCH	posted 10-13-2002 10:12 PM ET (US) You can find even pitch props, but I'd take the one you have to a prop shop and ask them to change the pitch an inch. Often the difference between brands and styles will be more important that the stated pitch. Cup in the blades makes a hugh difference for example. If you leave the cup alone and just have the pitch adjusted, it's fairly easy to predict the result. For changes of two or less inches this will not only save you money, but the shape of the manufactures blades will not be hurt by the adjustment.
Bigshot	posted 10-14-2002 10:06 AM ET (US) I hit 5900+ with a custom 20" SSt on a 15'. You may want to have her tuned up.
Cicada	posted 10-15-2002 07:26 PM ET (US) Thanks for the input. Two different directions to go and both sound good. Motor hasn't been tuned for awhile and should probably check the compression. Even with that will want the pitch adjusted on the prop. Had it reconditioned recently and am thinking that the pitch may have changed in the process. PM
lhg	posted 10-15-2002 07:51 PM ET (US) Mercury makes even pitched SS props, with interchangeable hubs for any brand of engine, in the 4 1/4" mid range HP gearcase size. You might want to try an 18" SS Vengeance. Their performance lines of props run 20-26" pitch, with some lower pitch Trophy Plus 4 blades also.