Moderated Discussion Areas
ContinuousWave: Whaler Performance
22' WD prop qwestions
|Author||Topic: 22' WD prop qwestions|
posted 03-30-2004 03:06 PM ET (US)
About a year ago one of the guys here emailed me with some info on his 22OR powered by a 250 Yamaha OX66 bored over and probably producing 260hp. He said that after much experimentation the best results he had were with a 15 1/4" X 19 Saltwater series prop.
Also in the last year I have seen Sal talk about the virtues of a Stilleto prop. I might be a slo lerner but after seeing that about a half dozen times I figured I'd go that route.
Assuming he has 10 more horsepower than I do how much difference would there be in optimum pitch?
How about the difference between a whaler drive and notched transom? Would they use same diameter and pitch?
How much difference between a boat with a T top and without?
I have seen much discussion about props on a 22'Revenge WD How much difference between a 22'revenge WD and a 22'outrage WD assuming both boats powered with 250hp and set up identically?
Would there be much difference between between prop brands? In other words assuming a stock OX66 prop is working for me would the stilleto use the same diameter and pitch?
There seems to be a wide range of diameters and pitches that different people are using. What are the advantages and disadvantages of larger diameter / decreased pitch vs smaller diameter/increased pitch?
Thanks for any assistance ; Sorry about the shotgun method of questions asked.
|John from Madison CT||
posted 03-30-2004 06:36 PM ET (US)
Greg: Maybe it was me who commented awhile ago about that prop..
I have a 22' Outrage, Whaler Drive and a Yamaha 250hp EFI (Ox66) and use the Yamaha Saltwater Series II, 15 1/4" x 19". I get ~ 5200-5300RPMS at WOT, trimmed out (med load). I have a teetop and front curtains on the boat too.(steals some RPM's)
Ideally, I would like to take 1/2" of pitch off my prop, but all in all, I am very happy with it. Great hole shot, no cavitation,and it bites well in a following sea.
posted 03-31-2004 05:30 AM ET (US)
John - I think you did get back to me with info on your yamaha 250. I think it was another John who was getting 5500 rpms out of a 30" 250 on a jackplate mounted on a notched transom. It had been bored over and was making 260 hp. He was using the same prop as you but getting 200-300 rpms more. Hard to say whether the additional rpms came from 10 extra horses, the jackplate, the lack of a whalerdrive or some other variable. I think he had a T top too.
Thanks for the information on your prop; with all of those differences ( 10 extra hp, a jackplate, and less weight and wetted surface from the lack of a whaler drive) the combined difference was 200 or three hundred RPM's more.
Unless I hear from Sal that a Stilleto prop is radically different I think I'm going to get the 15 1/4 X 17 Stilleto.
posted 03-31-2004 08:08 AM ET (US)
Everything I've read about the Yamaha Saltwater Series propellers suggests that they were designed cruising in mind, not top speed. A big boat propeller designed to get a good hold on the water.
posted 03-31-2004 03:29 PM ET (US)
I checked with the outfit that Sal recomended Aftermarket Marine and he told me that Silleto doesn't make a 15 1/4 diameter prop; they make a 14 1/4. I guess I am back to not knowing what to do. What is the down side to using a smaller diameter? If I go with a 14 1/4 stilleto what pitch should I use? Any Ideas?
posted 03-31-2004 06:09 PM ET (US)
I keep hearing that Mercury Mirage Plus props run very well on the big Yamahas. The 19" pitch model has 15 1/4" diameter. Maybe you should take a look at one of those for the $400 price tag. This would include a Yamaha hub kit in lieu of the Merc hub kit. The Stilleto and Mich Wheel Rapture props are more like the smaller diameter Mercury Laser II speed props which would not be recommended for the 250.
Also consider the 4 bladed Revolution 4.
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.