Temping the important stuff

[Blackjack-sven]

Out of curiosity, what is it that needs to be temped when checking the boat to see if all is well?

[Fluid]

ESC (caps and board), packs and motor (endbell, not water jacket). Anything over 150*F is probably too hot. Note that the ESC in particular will lose heat between the time it is stopped, the hull is untaped and the ESC is measured. If it measures 150*F, it was hotter out on the water, by up to 50*F or more.



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[Steven Vaccaro]

If it measures 150*F, it was hotter out on the water, by up to 50*F or more.



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thats for the tidbit! thats interesting.

[Fluid]

Yes, I was surprised at how fast things cooled down. The temp drop was an average from my Castle ICE datalogging files, assuming 3-5 minutes from stopping to measurement.


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[sailr]

I have found the opposite to be true. The motor and esc are hotter after they come out of the water because no cooling is running through them anymore! We have experienced this many times. If you temp a couple minutes later than immediately, you will find the temps have gone up!

ESC (caps and board), packs and motor (endbell, not water jacket). Anything over 150*F is probably too hot. Note that the ESC in particular will lose heat between the time it is stopped, the hull is untaped and the ESC is measured. If it measures 150*F, it was hotter out on the water, by up to 50*F or more.



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[Blackjack-sven]

I have found the opposite to be true. The motor and esc are hotter after they come out of the water because no cooling is running through them anymore! We have experienced this many times. If you temp a couple minutes later than immediately, you will find the temps have gone up!

Seriously? Does that make sense to you?

[DV8ion]

Seriously? Does that make sense to you?

Yes. Heat soak. The water that was keeping the part cool is now gone and the parts that were cool will now start to heat up from the warmer parts around it. I don't really see the core temp rising too much though. Theres more to it but thats it in a nutshell.

[785boats]

I find that heat soak is very noticeable with batteries as the heat from the internal cells radiates/convects out through to the external cells. Especially if the packs have been worked hard. The outside cells can get hotter after a couple of minutes.
So when temping a pack immediately after a run I always test at the side of the packs on the edges of the internal cells. That's usually the hottest part of the pack. Not on the shiny reflective label on the face of a pack.
Paul.