Hi Harry,

Sorry for the delay. Kraivuth is probably on a trip somewhere. He's a 777 Captain for Thailand airlines...

I'm no expert on the chemistry here and I didn't write the manual, so here's the best I can do...
From personal experience, I have used a variety of mixes and have come to use the Camping Gaz - CV470 canister, shown in this [link=http://www.caravanning-online.co.uk/acatalog/Camping_Gaz_Cartridges.html]link[/link]. (Note that this site is a UK supplier). I don't know what the mix percentages are, but it starts without a hitch here and has never frozen a valve. It doesn't smell anything like propane so the butane content is likely pretty high. Being in similar climate conditions I can say that it'll probably work just the same for you, although I don't use an on-board canister in my jets. I run a trigger valve on the large external tank, hooked up to the inlet of the SMC valve.

Regardless of the turbine manufacturer, I've found that in the lower end of the temperature spectrum sometimes even a large canister has trouble boiling off enough gas. Warming the canister by a few degrees will help. In cooler conditions, I usually leave it in the car till I need it and put it back in the car afterwards... If the tank is on-board, you may want to put it in a position where you can wrap your hand around it to sacrifice some body-heat.

As for the misconception in the manual, is probably just something that's been overlooked through the various edits. The term 'propane' should probably be 'start-gas' or something along those lines. It refers to the propane-butane mix used to start the motor. Hopefully Kraivuth will clarify it in the next manual revision. Thanks for pointing it out. From personal experience, I've tried pure propane a few times and various mixes, never freezing up a valve. Its probably possible, but unlikely. I'll leave that to Kraivuth to correct If I'm wrong...

Kelly