thanks for the replies, the parts availability is not great in the UK, if I were to go petrol electric, with no battery, the solutions would be expensive and heavy, even the alternators, while its a great idea, don't really work because trucks in the UK at 12 volts and I'm looking for at least 48 for a decent 850 watt motor. I'm going to move on to some belt drive ideas, and I have a few issues that need resolving, so I'll add a new thread.