1515 1.5y very hot

[BrianG]

I don't think simply running without a load would do that unless you were switching the throttle from off to WOT to full brake repeatedly. The over-revving theory seems a bit fishy too; 6s on a 1500kv motor is ~33k rpm, well within specs.

I've run motors without a load plenty of times during testing with no ill harm. I also go very gradual on the throttle too.

I'm not saying it's ok to run a motor without a load, but it seems odd that it blew the motor in 6 seconds. I would suspect something else personally.