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Thread: Q mono ESC amperage??

  1. #1
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    Mar 2018
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    Default Q mono ESC amperage??

    I am building a 38" DF 45 MK II Q mono course boat. TP 4070 3Y (1520kv), ABC 1914 or 2014 17-45 CL. Would a 300amp swordfish pro plus be overkill or would the 240amp pro plus be plenty? I want to make sure I've got enough ESC to run a higher overall pitch prop if need be.

  2. #2
    Join Date
    Sep 2007
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    NC
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    You want overkill for Q mono. I have a 38" DF mono for Q and log between 260-280A on average with spikes up to 340A. I have to add a lot of cooling to make the ESC survive this level, but it works for me. I am running a little more motor than a 4070, but plan on the 300A ESC.
    Tyler Garrard
    NAMBA 639/IMPBA 20525
    T-Hydro @ 142.94mph former WR

  3. #3
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    Quote Originally Posted by RaceMechaniX View Post
    You want overkill for Q mono. I have a 38" DF mono for Q and log between 260-280A on average with spikes up to 340A. I have to add a lot of cooling to make the ESC survive this level, but it works for me. I am running a little more motor than a 4070, but plan on the 300A ESC.
    Thank you sir. I've got a 300amp pro already so I'll go with it. How did you add water cooling, a water cooled esc plate? Any prop suggestions for my setup?

  4. #4
    Join Date
    Jun 2011
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    FL
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    Tyler is correct on 250 + amps easily with a Q. I run that DF with a 4070 1350kv for heat racing and find 1914/3 and X450-452/3 blades work well. Your 1520 kv will require less prop to make 6 laps. I do find 3 blades carry the boat better especially with the 300SF (the Brick) up front.
    Mic

    Mic Halbrehder
    IMPBA 8656
    NAMBA 1414

  5. #5
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    Mar 2018
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    TX
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    Sounds like the 1914/2 would be a good prop to start with since I have it already. I'll use a battery checker and see how much battery I have left and go from there. I dont have many 3 blades and none that'll work on that boat. I may have to add some more 3 blades to my collection. Thanks for the help guys.

  6. #6
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    Your best tool to check is going to be motor temp. After a run pull the cowl off and with your hand touch the end bell of the motor and the end of the shaft. You want to stay under 160-180F. If you cannot touch without holding your finger on the end for several seconds it's too much prop. You can also use an IR meter, but I find touching it with a finger is consistent and easy.
    Tyler Garrard
    NAMBA 639/IMPBA 20525
    T-Hydro @ 142.94mph former WR

  7. #7
    Join Date
    Mar 2018
    Location
    TX
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    32

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    Quote Originally Posted by RaceMechaniX View Post
    Your best tool to check is going to be motor temp. After a run pull the cowl off and with your hand touch the end bell of the motor and the end of the shaft. You want to stay under 160-180F. If you cannot touch without holding your finger on the end for several seconds it's too much prop. You can also use an IR meter, but I find touching it with a finger is consistent and easy.
    Thanks for the tip. I'm about two years into the hobby and will take all the help I can get. I probably would have thrown in the towel by now if it wasn't for all the help I have received. It is appreciated

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