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Thread: RPM loss on heavy load.

  1. #1
    Danhercules
    When a prop trims out and speeds up, there is a RPM gain.
    If a jetboat is loaded down with fuel, lots of people, will there be a RPM gain if the load is taken off the boat?
    Any thoughts on this? :idea:

  2. #2
    squirt'nmyload
    maybe.....i've never payed attention when i was running light

  3. #3
    Jetaholic
    Actually...as a prop boat gains speed, the prop unloads, therefore allowing the RPM gain.
    A jet boat can give all thrust at once...from a dead stop you can achieve max RPM from a dead stop. The amount of people in the boat will have no effect on actual RPM, but will have an effect on max speed. This is because a jet boat can achieve max available thrust right out of the gate, but the weight of the boat, people, cargo, etc etc...will determine max available MPH.
    To summarize, on a jet boat, weight has no effect on max RPM, but has everything to do with max MPH.
    Make sense?

  4. #4
    SmokinLowriderSS
    Like Jetaholic said, "no, there won't be".
    No change.

  5. #5
    McIntyrelocal
    if you want a little more rpm you will probably need to put a little more blocker in your intake loader and take a little bit of water away from the pump that might help the motor rpm.

  6. #6
    Danhercules
    Its not that I want RPM at all. It was just a question. I had 9 people in my boat this weekend and it just got my mind going.

  7. #7
    McIntyrelocal
    gotcha .

  8. #8
    Ken F
    You can tie your jetboat to a pier and it will still turn the same rpm.

  9. #9
    Danhercules
    Will the ski tow hold? Will the pier?

  10. #10
    centerhill condor
    Will the ski tow hold? Will the pier?
    give it a try...and take a camera and cell phone.
    CC

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