colopilot wrote:I like this propane idea, if for no other reason than it means not having a gasoline-filled machine venting out in the back of the plane all day. It does require a little planning ahead though, and runtime on those little bottles is going to be pitiful at max load (which you may be doing with preheaters). Still, a few bucks in propane is probably enough to get the engine warm before flight, and that's not such a terrible thing.
I dunno. I just can't get excited about little propane bottles. They seem kinda short on burn time, and while not hard to refill from a standard 5-gallon or larger, it can be inconvenient.
I'd rather burn some fuel. The little Dirty Hands Tools generator above has a fuel vent closure, btw. You only need to vent it when it's running to prevent low pressure in the fuel tank.