ok if im right i font this (Kv x Volts = RPM) so 6000kv x 7.4v=44400 rpm
if im right its (turns x volts)x 1000 = RPM) 5.5 x 7.4=40.7 x 1000= 40700 rpm

it does not really mach up but what what i can find, i know i might be doing something wrong but that is what i fond (kv x volts = rpm) so i would go form there if you know the turns to rpm then you should have no prob knowing what you wont to know