Honestly, the main reason for wanting to measure motor temps is because I recently had my mavic repaired, ESC board fried due to excessive heat. Here is my story . I wanted to see how well the voltage of the dual external Multistar 3000mah LiHV compared to that of the main. At that time I was using the battery clip, and had not yet hardwired it. The weather was windy and rainy, so all I could do is let it hover in my garage for about 5 minutes or so, just long enough to bring the batteries down some. I was just about ready to land when I heard a ticking noise, thinking it's one of the props nicking one of the wires. I started landing and about a foot above the garage floor the left front motor seized up and the mavic spiraled down the last 10 inches or so. There was no damage done to aircraft in any way, but when I went to touch the left front motor, it was so hot the plastic it sits in softened up to the point I could wiggle it. I couldn't understand why other pilots running the same setup did not have issues. It finally dawned on me that I had the 8331 low noise props on and with mine the props are much too flimsy to support the added weight and consequently needed more and more power which then "charred"(repair man used that word) the ESC board. Sorry for the long post.
Happy flying!
