FE Heat Measurements and Terminology

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  • Fluid
    Fast and Furious
    • Apr 2007
    • 8012

    #1

    FE Heat Measurements and Terminology

    When we run our boats most of us have learned to check the temperatures of the motor, ESC and packs. This is good information to share, letting others have an idea of the stress a particular setup puts on the components. The problem is how some describe their temperatures.

    The use of a thermal gun is best for this, but where the temperature is taken matters. For the motor, temperatures should be taken on the 'endbell' (opposite from the output shaft end), not on the water jacket. ESC temps should be on the board or the caps - there is usually a difference and the ESC cover can effect the reading. The ESC especially cools off very rapidly, so taking a reading three minutes after the run may not tell the real story. Reporting the temperatures recorded and about how long after the run the reading was taken is far more meaningful.

    What gripes me are the boaters who say things like "everything was ice-cold after ten minutes running." This is of course impossible if "ice-cold" means well below ambient - some heat is generated by all components. Some guys will say their boat is "cool", then say nothing was over 110*F! I don't consider 110*F as anywhere near "cool". I guess "cool" in summer means something different than it does in winter. So maybe "warm" means 130*F? Unless we know what a boater means by his vague temperature reports, they are almost useless.

    I would encourage all to be a bit more exact when reporting temperatures. Otherwise it's kinda like saying your boat is "fast"...what does that really mean?




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  • lenny
    Fast Electric Addict!
    • Sep 2010
    • 4293

    #2
    Thanks Jay.
    Still working on my 29 fine design to plane.LOL
    ? ONLY IF THEY WORK

    My youtube videos.http://www.youtube.com/user/61manx?feature=mhee

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    • Steven Vaccaro
      Administrator
      • Apr 2007
      • 8718

      #3
      Good thread.

      Dont forget temps at the connectors. I was running a high amp setup and had some performance issues. Grabbed a temp on the connectors and they were over 140 degrees. On the next run the boat died mid run. Connectors came unsoldered. I upgraded to 5.5mm connectors and the heat was down and no more melting.
      Steven Vaccaro

      Where Racing on a Budget is a Reality!

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      • Bigbore
        Senior Member
        • Sep 2010
        • 168

        #4
        Water temp?

        What's the correct method to measure the water temp?
        In the past months I got some reading with my non contact thermal gun but I'm not so sure about the measurement and I'm worried about the hot water in the incoming summer.
        What are you using for this?

        Comment

        • b.mcdaniel.2009
          Fast Electric Addict!
          • Sep 2010
          • 1641

          #5
          Great thread Jay. You always have very useful info for us!
          ..Eagles may soar in the clouds, but weasels never get sucked into jet engines..56" P.I. Fountain /37"Genesis Cat.-1717/T-180/33" DF Copy-1717/T-180

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          • Steven Vaccaro
            Administrator
            • Apr 2007
            • 8718

            #6
            Originally posted by Bigbore
            What's the correct method to measure the water temp?
            In the past months I got some reading with my non contact thermal gun but I'm not so sure about the measurement and I'm worried about the hot water in the incoming summer.
            What are you using for this?

            I'm not sure on if there is a way to figure what the change will be when the weather changes. BUT there is a big difference. Right now the air temps are in the 50f range and water about the same, I can not run the props once the summer comes and the air temp changes to the 80f range and the water is 60-70f.
            Steven Vaccaro

            Where Racing on a Budget is a Reality!

            Comment

            • Bigbore
              Senior Member
              • Sep 2010
              • 168

              #7
              Originally posted by Steven Vaccaro
              I'm not sure on if there is a way to figure what the change will be when the weather changes. BUT there is a big difference. Right now the air temps are in the 50f range and water about the same, I can not run the props once the summer comes and the air temp changes to the 80f range and the water is 60-70f.
              Here were I live now the air temp is in the (20°C) 70f range and two days ago I measured a water temp of 23°C 73f. So, it could be correct?
              For the following months I would try to add a ice tank inside the hull to reduce the water temp before going to electronics because I read a post with positive results.

              Comment

              • Steven Vaccaro
                Administrator
                • Apr 2007
                • 8718

                #8
                Originally posted by Bigbore
                Here were I live now the air temp is in the (20°C) 70f range and two days ago I measured a water temp of 23°C 73f. So, it could be correct?
                For the following months I would try to add a ice tank inside the hull to reduce the water temp before going to electronics because I read a post with positive results.
                For racing it every bit helps. But for sport running it seems like to much work.
                Steven Vaccaro

                Where Racing on a Budget is a Reality!

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