prop size for dasa 950

[Big Kahuna]

That's the point of the thread.... I realize pitch is entirely dependent on rider preference, I went thru 4 on my last set-up until I was happy... The 950 is on a friends boat... Isn't the lower the number the less aggressive? I know jack all about impellers... Title of the thread is for a Dasa 950 that's what I'm looking for

That is one of those "It depends" answers. Depends on pump, nozzle size (reduction), Pump Cone Size. Lower Numbers mean lower pitch, less power typically to spin up, Higher Numbers mean Higher pitch, more power to spin up.

But, again, pitch is just a base line. It all depends on your setup. If your porting is more race porting and you wanted more bottom end, pitch down to get the motor to spin up faster to get into the powerband. If your porting is more for lowend, Then you would want a lower pitch unless you wanted a little more top end. There are so many different variables.

When I ordered by 10/16 Hooker I was running 84mm big bore with stock pump and bored nozzle. Dave said to go with the 10/16. I was thinking weird, because so many guys with Lamey 85mm stroked etc etc were running 9/15's. Dave was spot one. A year later I had to swap back to my TLR ported 82mm cylinder. I was thinking, well, this prop is probably to steep. Not really, I could stand a little lower pitch, but it still works really well.

 

[munki63]

I hate impellers.... Pump set-ups cost to much dam money lol
how can you repitch yourself?

 

[jMike]

http://www.watcon.com/Catalog_Pages/Impeller_Pitch.htm

http://en.wikipedia.org/wiki/Adjustable_spanner

http://en.wikipedia.org/wiki/Sledgehammer

http://www.youtube.com/embed/jiT8Fys8RgA

http://impros.com/store/index.php/tech-info/about-impellers.html

 

[raytherace]

nice info right there !

 

[dcptr]

weird to see some of the above specs, as I was recommended a 14/21 for my 144mm 12vane non-set back for a xs1000, pfp, atp flame @ 28deg for flatwater.. I also have the big long nose cone in the pump atm, but not sure if I should put the short stubby in.. Currently have a 13/18 for the xs865ss and i'll be swapping shortblock's soon as well as the 14/21 recommended prop..

 

[Philip Clemmons]

144 is a small pump, requiring more pitch. Some of my numbers were for the 148 I run, which I may not have mentioned. Pump size has a HUGE effect on pitch......bigger pump, smaller prop and small pump, larger prop........

 

[munki63]

Engine builder also has an effect on impeller pitch because of the power band/ port timing, an XM1000 wont have the same pitch as a Dasa1000 and same goes for one of Arts motors

 

[Lucaumpits]

XS has way different porting specs then Dasa, the prop you gonna use on your XS 865 wont work with dasa 865

weird to see some of the above specs, as I was recommended a 14/21 for my 144mm 12vane non-set back for a xs1000, pfp, atp flame @ 28deg for flatwater.. I also have the big long nose cone in the pump atm, but not sure if I should put the short stubby in.. Currently have a 13/18 for the xs865ss and i'll be swapping shortblock's soon as well as the 14/21 recommended prop..

 

[Philip Clemmons]

XS has way different porting specs then Dasa, the prop you gonna use on your XS 865 wont work with dasa 865

You think?

 

[masterblaster]

You think?

listen to this guy on props,he knows whats up.started with the higher pitches and worked down till it was prefect,along with everything else..

How much diff pitch would you need between the 2... 850 motors dasa or xs if all else was the same?

 

[Lucaumpits]

You sound like you know all about props out of sudden, huh?!?

You think?

 

[Philip Clemmons]

You sound like you know all about props out of sudden, huh?!?

I've tried "a few" lately

 

[McDog]

I'm about to try a 10/16 hooker in a 144 Solas mag. I expect it to be too shallow but I'll post results.