Quote:
Originally Posted by freebeard
It would be hard to go wrong with a 3D-printed (plus CNC tube bending) 1/2 scale model of the Doble drivetrain.
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The Doble Model E had an inline, double expansion (no pun intended), double acting (again, no pun intended), four cylinder engine. It had piston valves. I'm not so sure what kind of cylinder and valve timing it had. Probably like many late model steamers the valve timing was variable. (And we think we're so far ahead with variable valve timing on our ICE's!) it had a steam pressure of up to 750 psi (52 bar) and a temperature of up to 750 °F (400 °C). The acceleration was said to be comparable to a Duesenburg (0 to 60mph in around 8 seconds.) The neat thing about the Doble was the keyed 30 second starting system. It was as easy as, put in your key, turn and go.