Hi again colstonman:

Well ... I did a REAL fast web search for Robbe, motors but I really didn't spend enough time to get any real good info, and on second thought, I only think you said your motor was a Robbe!

SO ... I guess the bottom line is that if you've gotten (I'm GUESSING!) 20 or more flights out of it as this point, and the brushes are still not looking like mercury vapor lamps, the thing has to be reasonably decent. THEREFOR, don't fool around with anything! If it's running well (and yes, it will get warm, and sometimes good and warm), don't worry about it. I think the trick is to be really aware of significant changes in flight duration, noise, unusual heat, smells funny and that sort of thing from flight to flight.

When you get an extra battery pack or two, just make sure to take a break between flights for a bit, and then squeeze the flights together until you are uncomfortable with any excess heat buildup.

Another thing, I don't think you should be putting the packs in the freezer to cool them down. NiMH's are pretty happy with flying hot off the charger. I really don't think they would like the temperature "shock".

Same with the ESC ... cooling it down with an ice pack when it's hot is more likely to cause rapid cooling which could crack a printed circuit board or solder connection or do some other damage.

I think you're all set! It's been rewarding to offer you whatever help I could.

Keep us posted on these forums.

Once again, Happy Choptering,

Russ