Most likely, one of the mounting screws is protruding too far into the motor and locking up the rotor. Definitely sounds like a physical blockage rather than an electronic issue.
Hi Folks;
I'm Jim, I'm mostly an Aeroquad guy, but I've been branching out and trying a few other products as well. I've been flying RC in the shadow of the Rockies since the 70's, and I've been flying helis for six years. I tried to build an experimental quad about four years ago. The...