Originally Posted by
Ghost
Just wanted to make sure I had this right...when you get to 51 at 4400rpm, you can add throttle and drive the rpm up to 4900, but speed doesn't change? You're just slipping/ventilating more and more as the revs climb? If that's true, and if your max power is up at about 4800 or 5000, I'd expect you MIGHT make another mph (maybe as much as two) by getting the revs up with less pitch. If there's a right prop to do it I mean. You're not getting full power down at 4400. Question is what wheel would hold its bite with your hull past 51 at your level of trim, and is there one below 19" pitch that would spin 52-53 at 4800-5k rpm. Hmmm...
(One aside: I assume you're running the test with a light load of people/fuel/gear, such that you should be topping out your rpm under the loading conditions. But if not, that's worth doing in seeking the right prop. I figure you're already on that one.)
Yup, pretty frustrating. I would like to find something that will allow me to run 4800-5000 WOT light and still be hooked up even with some positive trim. The B1 was amazing right up until I ran out of steam at 4100 - great midrange and enough traction to really carry bow. Handling was exceptional, no blowouts on sharp turns. It was just too much prop for my combo. Four blades at 15.25 diameter is a ton of prop.
The Vengeance is advertised as the budget Quicksilver prop - it is definitely not ideal for any kind of performance, particularly in the aerated water coming off the step.
Gotta find the middle ground!
Last edited by duckhunter; 06-18-2013 at 09:41 AM.
Reason: clarification
"Speed's fine, but accuracy is final."
- Bill Jordan
1998 Donzi 21LXR
1971 Boston Whaler 13