prop quiz

[airbornexp]

hey guys, new to the site but have been lurking mostly on GH. I built a 951 X-4 boat and wondering if i have the wrong prop. Ive basically have a stock 951 with some Tau-Ceti F/A's and on the pump I have a Skat Trac 6 Vein 148mm magnum pump a skat trac 15.5/22 swirl with a skat exit nozzle with an 83 or 87mm ring and a RXP exit nozzle.

my question is, is my prop too tall? it seems like its struggling a lot and cant get max rpms out of it and I can only get 56mph on GPS. on top of that it cavitates out of the hole.

any insight would be appreciated!

 

[jwick86]

Do you know what size the RXP exit nozzle is? I was told by skat trac to run 3mm difference between the venturi and the exit nozzle, with the exit being bigger.

Is the pump sealed good? That 22 on top seems a little big since the stock 951 only comes with a 15/20. I understand a lighter hull.

You can always check with Bill Oneil at Watercraft magic. Extremely smart and knowledgeable. He is always on PWC today under industry leaders.

 

[6KJR]

I run a 17/22 Skat on my X4 787. Works excellent.

 

[Chester]

What is your max RPM now?

Chester