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About LinkBacksi have seen all kinds of charts and graphs of impeller selection charts. i have not seen one however that shows different cuts and flow in GPM at given RPM. does one of these exist?
different impeller load chart
i have seen all kinds of charts and graphs of impeller selection charts. i have not seen one however that shows different cuts and flow in GPM at given RPM. does one of these exist?
Came across this, if it helps.
if you ever wondered what the differences were in impeller cuts......hmmm......350rpm from a B to an A......i wonder if that guy has his steak medium rare??
could be just a POS impeller with the tolerances all jacked up too for articles sake. interesting chart.just sayin
Last edited by Spiritof76Cobra; 05-12-2012 at 07:33 AM.
Cyclone did that article in an old hot boat mag and did the testing, I can assure you there was no junk and it was done right.
Don't think it was:Originally Posted by Spiritof76Cobra
if you ever wondered what the differences were in impeller cuts......hmmm......350rpm from a B to an A......i wonder if that guy has his steak medium rare??
could be just a POS impeller with the tolerances all jacked up too for articles sake. interesting chart.
impeller cut vs rpm vs speed testing
S CP
"Dark Sarcasm"
Going fast is only half the fun ... what you make go
fast is the other half.
" A Government big enough to give you everything you want is big enough to take away everything you have"
I asked a similar question sometime back:
How many GPM does an "A" impeller pump at 7,000 rpm ?
^^^
Click on link
S CP
Last edited by Sleeper CP; 05-12-2012 at 12:00 PM.
"Dark Sarcasm"
Going fast is only half the fun ... what you make go
fast is the other half.
" A Government big enough to give you everything you want is big enough to take away everything you have"
thanks for the links sleeper. both good reads and a bit more insight to what i was looking for. for anyone wondering i was looking to put together a chart with different output pressures with a standard nozzle for any given rpm with different impellers. with as constant as the rpm/Hp is required to turn different impellers it should be easy to figure out exit velocity and pressure and then calculate that against the other figures required to pick an ideal imp for motors, giving the best acceleration and top speed, not just how much power it will take to turn it. every car will get to 80 MPH but the ones that get there in 4 seconds are much more fun to drive opposed to those that get there in 13 seconds. with this i would assume its the same for boats and crunching numbers is much cheaper than buying impellers and gaskets to change them for trial and error method
thanks for the replies so far and if anyone remembers anything else please share
Joe
^^
Well there are at least a few dozen people reading your post that know more about this than I do, so maybe one of them well chime in.
I know more than 1 racer who has found out that his boat accelerates quicker with a smaller impeller. Think gear ratio... a 4.57 gear will accelerate a car quicker than a 3.25 gear. The question with a boat is why? if the larger impeller is moving more water ....does the smaller impeller move more water at 500 or 1,000 rpms higher than the larger impeller moves at the lower rpm ?
I guess the math would say "Yes" otherwise why would it accelerate quicker?
So take a boat with an AA and make cuts down to a C and find out. But a lot of that would depend on the engine combo. A lot would come down to .." what was the engine built for"
Hope some of that helped .... someone can pick it up from there.
S CP
"Dark Sarcasm"
Going fast is only half the fun ... what you make go
fast is the other half.
" A Government big enough to give you everything you want is big enough to take away everything you have"
As well as the hull design, weight and intended application.
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