One would still have to stop to pump the water from the aux tender and also refill the displacement lubricator. Miniature live steam is all about the balance of water, fuel and steam oil. Some engines are designed to run out of fuel BEFORE the boiler is empty, so a stop would be necessary for topping up fuel and water plus steam oil. Twenty minutes or so is considered reasonable run time for many gauge one engines. Larger engines have axle pumps for boiler filling from larger capacity tenders and will also have larger capacity lubricators for longer running times.
Steam oil is high temperature lubricating oil for pistons and valves on steam engines of ALL sizes including the real thing. Viscosities vary even for the gauge one models, but all varieties can withstand the temperature of the steam in the valve and piston cylinders. Displacement type lubricators found in the smaller steam locos usually need frequent draining due to the steam condensing into water after displacing the oil to the cylinders. This is one of the sound reasons for frequent service stops.
Twenty minutes or so is considered reasonable run time for many gauge one engines. Larger engines have axle pumps for boiler filling from larger capacity tenders and will also have larger capacity lubricators for longer running times.
My live steam Daylight GS4 easily runs 50 minutes to an hour:
Gas firing, unlike alcohol, is MORE dependent on ambient temperature and wind conditions. Low temperature climates are NOT favorable for butane and isobutane fuels. A propane/butane mix is indicated for colder temperature gas firing. Such mixtures are available for certain types of camp stoves.
Firing an ordinary-constructed gauge one live steamer on 100% propane is strongly NOT recommended! As propane is a MUCH more expansive gas with greater BTU capacity than butane, one would have to have a specially constructed firebox and boiler to handle the increased thermal expansion and pressures!
I should mention that there was only ONE fellow out of the hundred or so attending the Diamondhead Steamup that had the 100% propane loco of his own design and construction. NOT fot the faint of heart!
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