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  1. #1

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    RXP-X prop test on RXP

    Folks, just reporting my test results today. I borrowed a stock RXP-X prop from SeaRayEX12 (thanks!) and tried it out on my turbo ski.

    The long and short of it. . . 2004 RXP, T3 60 trim turbo at 12-15 psi, AEM F/IC and 62 lb/hr injectors, XSPower intercooler, Riva grate, 81 mm nozzle. Hot and Humid. Full tank of gas. Out the box (off the ski?) RXP-X prop. My measurements indicate that it's a 14/23, but I noted that it stays 14 for a large portion of the blade, then kicks out to 23 at the trailing edge.

    At 8100 rpm, it went 76.5 mph on the GPS.

    I was modulating the throttle to keep it off the rev limiter, so take the boost numbers with a grain of salt.

    Looks to me that this prop acts slightly taller than a Solas 15/20. If you're looking to build a low budget Stage 2 or Stage 2+, this may be the prop for you.

    Mike
    Last edited by engineermike; 06-18-2008 at 09:00 PM.


  2. #2
    West Texas RXP skoepp's Avatar
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    Quote Originally Posted by engineermike View Post
    Folks, just reporting my test results today. I borrowed a stock RXP-X prop from SeaRayEX12 (thanks!) and tried it out on my turbo ski.

    The long and short of it. . . 2004 RXP, T3 60 trim turbo at 12-15 psi, AEM F/IC and 62 lb/hr injectors, XSPower intercooler, Riva grate, 81 mm nozzle. Hot and Humid. Full tank of gas. Out the box (off the ski?) RXP-X prop. My measurements indicate that it's a 14/23, but I noted that it stays 14 for a large portion of the blade, then kicks out to 23 at the trailing edge.

    Good info Mike.
    Very good to see that you are running that speed at 8,100 with that prop. I actually have put the stock prop back in my X over the 15/22 as the 15/22 is too much prop for my heat and altitude. Atleast i know that 75 is possible with that prop.

    At 8100 rpm, it went 76.5 mph on the GPS.

    I was modulating the throttle to keep it off the rev limiter, so take the boost numbers with a grain of salt.

    Looks to me that this prop acts slightly taller than a Solas 15/20. If you're looking to build a low budget Stage 2 or Stage 2+, this may be the prop for you.

    Mike
    sorry i typed the above in the wrong place and too lazy to move.

  3. #3
    Kiwi spanner handler
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    we ran a stock x prop slightly pitched up on our c kit boat with good results

  4. #4
    Antiguan FZR's Avatar
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    So if I were to spin my stock prop to 8100 RPMs with the same nozzle, I would see 76.5? Thats exactly where I want to be.

  5. #5

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    Quote Originally Posted by Antiguan RXP View Post
    So if I were to spin my stock prop to 8100 RPMs with the same nozzle, I would see 76.5? Thats exactly where I want to be.
    I could be wrong here, but I think on the RXP-X the pump tunnel is larger than the RXP and that causes drag and less speed vs. the RXP for any rpm/prop/nozzle combo. So, it won't quite do the same speed but should be close.

  6. #6

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    Also, folks, keep in mind that I had a totally full tank of fuel. It may have done 1-2 more mph on an empty tank.

  7. #7

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    Mike I Have A Stock 15-19r Three Blade Impeller You Are Welcome To Try If You Like.todd

  8. #8

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    Quote Originally Posted by Turbo Todd View Post
    Mike I Have A Stock 15-19r Three Blade Impeller You Are Welcome To Try If You Like.todd
    I have to say, the board members here are the best in the world. So far, I've borrowed and tested a Riva ECU/50# injectors and an RXP-X prop. I may be borrowing a 15.5/22.5 3 blade to try. If I get that one, then the 15/19r would be a move in the opposite direction.

  9. #9
    jpeconsult's Avatar
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    Mike, although the RXP is not my focus, I enjoy watching your threads. I may go to engineer school up north one day. lol

  10. #10
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    Last edited by iflyems; 06-21-2008 at 08:45 PM.

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