Yesterday we were out running in 100*F heat, our motors, ESCs and packs were coming in from 120* to 140* after one mile. It matters where you take the temps, search for the hottest part of each component. I don't like anything to be over 140*, but that limit works without damaging anything. Realize that these temps were recorded less than one minute after pulling the boat from the water. The ESC especially can cool off very rapidly.
I've burnt up Scorpions at less than a measured 200*F. The wiring shorted internally; they are very good motors but are designed for airflow in planes and and are not bullet-proof. Here is what their copy says:
"The stators are epoxy coated to prevent shorts, and are wound with wire that is rated at 180 degrees C (356 F). The magnets used in Scorpion Motors are rated for operation at 200 degrees C (392 F), making a motor that is virtually impossible to burn up in normal use."
It is not uncommon for one motor in a twin setup to be a bit hotter than the other. One works harder in turns, so which is the hot motor depends on which direction you turn....
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