The engine can be run at varying speeds causing the generator to give variable frequency AC electrical power output which is converted by the frequency converter means to {TAIL ~ an AC electrical power output} having substantially the predetermined constant frequency of {HEAD ~ the mains} 
The engine can be run at varying speeds causing the generator to give variable frequency AC electrical power output which is converted by the frequency converter means to { TAIL ~ an AC electrical power output } having substantially the predetermined constant frequency of { HEAD ~ the mains }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD