RE: [omc-boats] Cupped props ??

Daemian:
 
A Cupped 13" prop will give you the out of the hole performance and at
the same time give you the WOT rpm's. The keys to picking a prop are as
follows:
 
* With the boat generally loaded with fuel, gear and people, you
want to be able to achieve WOT (wide open throttle) rpm's. Each motor
will have a 400-500 rpm WOT range. It is very important that the
engine is allowed to top out at WOT-rpm's. Under rev'ing, causes the
motor to load up and over rev'ing will cause the motor to break.
* A cupped prop will have a slight curl to the trailing edge of
the blades. The primary purpose is to hold the water on the blade
longer without causing cavitation. Generally a cupped prop is on a SS
prop.
* If you can try the prop on a trial basis then you will be able
to see if it helps.
 
Good luck,
 
David Avedesian
Sweet 16 "Never Been Kissed"
Silver Spring, MD
 
 
 
-----Original Message-----
From: owner-omc-boats@... [mailto:owner-omc-boats@...]
On Behalf Of Bill Desmond
Sent: Saturday, July 02, 2005 9:00 AM
To: omc-boats@...
Subject: [omc-boats] Cupped props ??
 
First off, thanx for the responses to "painting the rogue".
My next issue is with my 55 horse v4. It doesnt wind up when you have
more than one person on board. It has a 13 3/4 x 15 prop. I would like
to go down to a 13 pitch. And im always dragging the kids on the tube
so it would really help. The only 13 props I can find are "cupped" and
they say they are equal to 2 degrees over. So it wouldnt matter to get
the 13. Unless my 15 is cupped then it would make the difference im
looking for. So my ?? is, can you visually tell the difference between
a cupped prop and a standard prop. I can always run numbers to find out
what type it is but would like to know if you can look at it and see.
Thanx
Daemian
  _____

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Received on Saturday, 2 July 2005