Thread: Pitch Vs Rpm. Your speed.
11-15-2011, 11:12 PM #1
Pitch Vs Rpm. Your speed.
Since you can take out ALL engine mods from this equations.
Trying to find the path to more top speed. And Knowing what Rpms vs pitch will help me see where i need to end up with power. Or if my issue is with the hull.
For example if people are only seeing 89-90 MPH with a 15/22
Then it would be almost impossible on the stock RXP hull to do same speed with 15/19
I want this thread to better give us an idea of speeds and props.
11-16-2011, 07:58 AM #2
GPS Speed 81.1
Ski 06 RXP
11-16-2011, 08:03 AM #3
11-16-2011, 08:34 AM #4
11-16-2011, 08:40 AM #5
We need more data as everything affects impeller selection.
What brand/model impeller?
What nozzle size?
What intake grate?
Impeller ## are only used for reference and you tweek from there and every tweeker uses the ## different.
11-16-2011, 08:42 AM #6
80.6 MPH (straight up on the seat and in the heat)
Last edited by dnielsen; 11-16-2011 at 10:58 AM. Reason: added info
11-16-2011, 08:44 AM #7
- Join Date
- Sep 2007
- Lexington, Ky
GPS Speed: 78.4
Ski: 08 RXPX
Impeller Type: Skat SuperSwirl 3-blade
Nozzle: OEM RXP 83mm
Intake Grate: Worx
Definitely like what your doing here and think it will be a great reference tool, but taking engine power out of the equation, ride-plate type, impeller root angle (what original pitch was, if pitch has been added or subtracted) and impeller type/brand will all play a role in efficiency/performance especially at higher RPM's. I realize your trying to remove as many variables as you can, and keep this as simple as possible, but just thought that worth mentioning.
Last edited by boostaholic; 11-16-2011 at 08:49 AM. Reason: Or what Beerdart said, he hit post while I was spell/grammer checking ;-)
11-16-2011, 08:44 AM #8
GPS Speed 81.1 best...80-80.1 average
Ski 06 RXP
What brand/model impeller? Solas 15/22R trued to 15/22 by Duke
What nozzle size? 83mm
What intake grate?Riva
11-16-2011, 08:57 AM #9
- Join Date
- Oct 2006
GPS Speed 85+
Ski GPRXP, 2rude, ported, ems, doo pump
Grate Dual Bar 1200
11-16-2011, 09:01 AM #10
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