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Thread: Neu 1521 jet unit no cooling esc?

  1. #1
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    Default Neu 1521 jet unit no cooling esc?

    Hi,

    So I have a large 1,3m long mono im converting to direct drive, it was a geared belt drive...

    I really would like to not drill the hull if I can get away with it but...

    Would a 1521 1Y on 4s driving a 30 (maybe 35mm) jet unit require cooling?

    Which ESC should I go for? I have the as26's but they don't work very well with 4 pole hence my purchase of Lehner 2250's for my other boat and these are spare...



    I was thinking about longer run times using 10,000mah packs / side... maybe cooling would be needed?
    Graupner Azimut atlantic challanger, HPR 115

  2. #2
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    Default

    A jet unit will be harder on things than a standard prop setups. A jet sees more of a constant load. So yes water cool ESC and motor. Just tap a fitting to the unit after the impeller and you’ll be good. You can also tap the exiting water into the unit before the impeller.

  3. #3
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    Default

    Oh and most jet units like a lower rpm, say 20’ish thousand.

  4. #4
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    Hmm, how do these work with NEU motors?

    https://www.offshoreelectrics.com/pr...=ose-R-150C-v2

    I could always run them 3s with them ESC, my current ESC are 4-8s so for some reason I just figured in that range...



    And cooling... for some reason I have the urge to try and internal cooling system, little bit of a faff but could be cool... weight isn't a issue with this boat so thinking a nitro fuel tank, one of these and some ice cubes https://www.mhz-powerboats.com/shop/...ater-pump?c=81
    Graupner Azimut atlantic challanger, HPR 115

  5. #5
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    correction, they are actually 28mm jet units...

    Would 2x 1521 1Y on 4s really need cooling spinning a 28mm plastic impeller...? hmm
    Graupner Azimut atlantic challanger, HPR 115

  6. #6
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    Quote Originally Posted by vvviivvv View Post
    correction, they are actually 28mm jet units...

    Would 2x 1521 1Y on 4s really need cooling spinning a 28mm plastic impeller...? hmm
    Have you got a pair of old Graupner drives there?

  7. #7
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    Yeah,

    anyone care to comment how the OSE esc's work with Neu motors, specifically the 1521 series?
    Graupner Azimut atlantic challanger, HPR 115

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