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Thread: New motor and prop set up. What prop do I pick??

  1. #1
    Join Date
    Sep 2016
    Location
    PA
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    222

    Default New motor and prop set up. What prop do I pick??

    I recently switched my motor set up on my Blackjack 24 from a Leo 3650 2750kv with a seaking 120a on 5s to a Leo 4074 1800kv with a Raider 150a on 5 or 6s. I had been running the blackjack 29 prop, an M440 or X637.

    Obviously my Rpms are way down on the new set up and I have plenty of room to prop up but how far should I go? X445? 1.5 pitch on a 47mm prop?

    It's disappointing on the X440 because it's slower than my previous set up. Appreciate any help on this

  2. #2
    Join Date
    Dec 2010
    Location
    NY
    Posts
    3,115

    Default

    Quote Originally Posted by RuntheraceAMC View Post
    I recently switched my motor set up on my Blackjack 24 from a Leo 3650 2750kv with a seaking 120a on 5s to a Leo 4074 1800kv with a Raider 150a on 5 or 6s. I had been running the blackjack 29 prop, an M440 or X637.

    Obviously my Rpms are way down on the new set up and I have plenty of room to prop up but how far should I go? X445? 1.5 pitch on a 47mm prop?

    It's disappointing on the X440 because it's slower than my previous set up. Appreciate any help on this
    the diameter on a X445 is 45 MM with a 1.4 pitch ratio

  3. #3
    Join Date
    Sep 2016
    Location
    PA
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    222

    Default

    Do you have any suggestions for what I should prop up to?

  4. #4
    Join Date
    Apr 2007
    Location
    AZ
    Posts
    8,009

    Default

    You should be able to go to an m645 on 5S. Can't speak to how it will handle or what the run time will be.


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  5. #5
    Join Date
    Sep 2016
    Location
    PA
    Posts
    222

    Default

    Fluid,

    I ordered that prop so I will give it a try. As for how the boat handles..... I'm running a Leo 4074, 150a esc and 5 to 6s batteries in a blackjack 24. It doesn't handle. Lol

    This is too much prop but I just wanted to try it. I just ran a 47mm prop and it was a screamer. Stupid fast. So much so on my second pass I was close to the shoreline while full throttle. I got too close and did a quick steering adjustment. It lifted off the water and flew at least 30 feet straight into a tree.

    Good thing I have another hull.

  6. #6
    Join Date
    Jul 2016
    Location
    IL
    Posts
    4,100

    Default

    Your wife is costing herself more money by limiting you to the 24" boat.
    Vac-U-Tug Jr (13mph)

  7. #7
    Join Date
    Sep 2016
    Location
    PA
    Posts
    222

    Default

    I had that exact thought today. Very true.

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