Batteries finish race?

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  • Panther6834
    Senior Member
    • Apr 2020
    • 708

    #16
    Originally posted by TRUCKPULL
    NAMBA rules - Electric - section - 28 - page 5 - D - a - in the chart on the right hand side - these are the max mAh of batteries allowed onboard each class and size of boat.

    Larry

    PS - also note in the rules that any boat over 10S is not Insured under NAMBA or IMPBA- which also means that they CANNOT run on any insured water of either organization . NOT even for fun or demonstration.
    Understood...however, the 'Power Specification', as covered by Section28, subsection D-1-a does NOT specify that's a "per boat" capacity, nor does it specify it's a "pet motor" capacity. In fact, it doesn't specify anything other than some 'general' maximum mAh capacity. For single-motor/ESC boats, this would be obvious...but, in regards to classes allowing multiple motors, in NO area of this specific rule does it specify anything about whether the maximum mAh capacity applies to the boat, or to each motor/ESC.

    Moving into two other rule subsections that are directly tied to the previously mentioned rule, Section 28, subsection D-1-c-i, states the following:
    "Each motor must see a nominal voltage within the Power Specification. The mAh capacity maximum within the same Power Specification is for all motors combined."

    This would give the impression that, whether using 2 motors, or 4 motors (I know, there's no such thing...but, bear with me on this example), all motors can use no more than a combined 10K mAh capacity.

    However...here comes the rule that appears to contradict the previous rule...Section 28, subsection D-1-c-ii, states the following:
    "The sum of the nominal voltages powering each motor must be within the Power Specifications. The mAh capacity maximum within the same Power Specifications is for each motor."

    While the first sentence of this rule clearly indicates that each motor cannot exceed the voltage limitations, it's the second sentence that I'm referring to, as this would give the impression that each motor (and thus, each ESC) can have up to a maximum 10K mAh battery. As such, based on this understanding, a dual-motor/ESC configuration would be allowed up to 20K mAh in total power, based on a 10L mAh maximum for each motor. When reading it exactly as worded, this implies that each motor is limited to a maximum capacity of 10K mAh...although, if going this route, it also appears that each motor would then be limited to a 2S battery (ie. the "sum of the nominal voltages" portion).

    I think I've just figured it out, based on Section 28, D-1-c, which states:
    "There are two acceptable multi-motor configurations for the Power Specifications that allow multiple motors".

    It seems, for vessels with multiple motors, drivers have two options they can select from:

    1) Can use two 4S packs, one for each motor, but the combined mAh capacity of both, combined, cannot exceed 10K mAh.
    2) Can use two 2S packs, one for each motor, and EACH of those 2S packs can be up to 10K mAh.

    I believe we have a "winner".

    ~ More peace, love, laughter & kindness would make the world a MUCH better place [emoji1690]

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    • TRUCKPULL
      Fast Electric Addict!
      • Apr 2007
      • 2971

      #17
      IN my twin boats - I wire them so that each motor sees both batteries (Two 6S - 5,000's - 10,000 total on board)
      This way towards the end of a race after turning right - one of the motors does not see a different voltage then the other.

      The chart says 10,000 max. -- the chart is showing this MAX for all boats from "N" to "Q" no mater if you run one or any amount of motors.
      You mentioned 4 motor earlier, I have seen 6 motors, driving two props, in one boat many years ago.

      Larry
      Past NAMBA- P Mono -1 Mile Race Record holder
      Past NAMBA- P Sport -1 Mile Race Record holder
      Bump & Grind Racing Props -We Like Em Smooth & Wet

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