A 3 inch scale Atkinson steam wagon to the Ray Prime design, serialised in "Engineering in Miniature" some years ago.
Silver soldered copper boiler, working pressure 100psi, feed by mechanical and steam pumps. Twin cylinder engine with mechanical lubricator, single fixed speed transmission. We've had it running around the yard this week - Ashley drove it about, sitting cross-legged on the bed. It runs, although there are various bits need tweaking, including a leaking clack valve.
Hydraulic test 8-3-2011 @150psi for 100psi working pressure
scale | 3 inch |