Getting a bad squealing noise when going to full throttle. and it is not coming from a loose prop...sounds like esc is screaming. And motor comes to almost a stop when this occurs ... Brake is disabled ....Using aexceed 30amp proton esc,common sense motor #E8-S-10 1000kv,and 1300mah 11.1 lipo 30c. Airplane is a great planes reactor, flying weight is27oz . The motor i have used in another setup before this one and it worked great..The esc is new, but alot of good things has been said about it..makes me wonder?</p>

One thing to try is lowering timing in the ESC a bit. From "high" to "medium".

Actually my setting is on low that is the default on the esc..which they say is suppose to work on most motors. but i'm going to try one of the other settings.. thanks for the help!

does sound like a timing issue....

make sure all solder joints are good too...

definitely sounds like timing.

Not familiar with that ESC, but try Hard/Fast timing and Fast Acceleration if you have those options.