Why 65?

[Sedri]

Excuse me if this question has been asked before, but I searched the forum and didn't find the same question, so...

If brushless motors are most efficient at 40,000 rpms and under and so should be battery-matched and geared to have them spend most of their time in that range,

what's the fun - er, purpose of having a 60 or 65,000 ceiling brushless motor if this is true?

Is is okay to have your brushless motor occasionally run up to max rpm, but not necessarily spend extended time there?