Thread: 1 Degree of Pitch = 300 RPM's??
06-11-2006, 07:33 PM #1
1 Degree of Pitch = 300 RPM's??
Guy's I have a speedster S200 with tons of mods but right now I have the stock 4 blades re pitched from 10/21 top RPM's of 7800. Then I cleaned up the intake grate and polished some of the pump then polished the impellers and re pitched them to 10/19 and now I'm turning it to 8400 to 8500 rpm's on the limiter. Glen at Skat wants to re pitch to 10/20's thinking it will drop 300 R's. Man I just don't no. I know they were supposaly10/21 to start with but it hits the limiter so hard I can't see one degree dropping it 300. What do you guy's think????
06-11-2006, 07:54 PM #2
I had a 14/19 on a stage one RXT then I saw 7800. Went to 14/17.5 and saw 8100(might have been more though). You can do the math...
06-11-2006, 08:07 PM #3
From most of the re-pitch posts that I have read on here you see roughly 200-300 revs when you add or remove a degree. I think you'll see 8200-8300 with a degree increase. Get it off the rev limiter and you'll see your mph go up
Somefun, I promise to get mine out this week and update you on my 12/19 repitch. I haven't used my 3 blade and am almost considering returning it based on your results...poor holeshot and the vibration. What do you think?
06-12-2006, 04:53 AM #4
I don't think they would take it back Yuji. I wish they would because I'd send mine back but I can't see them taking them back. I think I'm going to go back the 10/21 I'm hitting 8300 to 8500 it's hard to say because there are no numbers letf on the tac when its that high.
06-12-2006, 09:43 AM #5
I'm going to call them today and see what they say. The 8000 rpm tach sux, may have to find an inexpensive digital tach to verify rpm...more $
06-12-2006, 07:15 PM #6
Yuji how'd you make out with Skat? I may try to have them put some more pitch in my 3 blades and see how that goes. If it isn't much better I may see if Glen will swap them out for 4 blades.
06-12-2006, 10:07 PM #7
I called Glen and he really wants me to try the 13/17 first before I make a judgement call. Going by your experience with that pitch (cavitation, less acceleration) I can't see me with less power being able to spin it. I'm working on the boat tonite and if I get it all done I'm going out tomorrow to try my 12/19 stock repitch.
06-13-2006, 04:59 AM #8
did he say he'd take it back? you may want to see if you can get a four blade from him when you find out what pitch you need. my fastest speed yet was with the 3 blade at 8400. I'm going to see what it will do if we change it to 13/19 I think it may run 68 ,69.
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