Yeah Eric, the heat loss over only 300mm was a wierd one.
As for bringing a multi-meter up on Friday, I'll probably have the whole thing built and running by tomorrow afternoon
I will put a 'Pot' in the fan line, and re-measure the Nichrome at 15 volts. It will be slightly different to the 13.5 volt supply.
I'll work something out
EDIT: I might as well put 'Pots' on all the lines while I'm at it. I have some