A mate of mine is learning fly a chopper , he has just got of the ground , about 2 to 8 ft , but the chopper looses power after a while in the air , his pitch curves and pitch settings are ok , sometimes he battles to get it off the ground

he was told that the engine needs to be taken out of the chopper and bench run at max throttle for a few tanks , the term used was" a stubborn engine " , as it was not run in at various rpm's or throttle range , to me this seems like a ""memory "problem !!!! The engine is a webra 32 FH

any views !!!

Sounds to me like he is running it too lean and it is getting too hot. That will make it do what you are saying. Richen it up a bit, and try it again. My webra engines need more break in than any other I have run, but I wouldn't take it out. Just richen both needles a tad, and if need be, tie the heli down and get it set right before you fly it. Have done that with many of them to get them set up right.

The Webras can be tough on needle setting try setting the needle correctly.
Rough setting for Webras
http://www.rcuniverse.com/showthread...362&forumid=23
Try Flyboys pointers firstt