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Jim Volkening,     Cumberland County, NJ.,


Engine type: Air/steam single action horizontal

Valve Type: cross slide

Cylinder(s): One      Bore: ˝ inch        Stroke: 1 inch

First run: 23 February 2007


This engine is an adaptation of the McCabe Runner .  It was also inspired by Ed Warren’s design for “Lucy”, a single action oscillator made from Lucite. The clear acrylic standard and integrated cylinder allow the viewer to see into the engine to better understand how it works.   The engine is built primarily of acrylic .  The piston , valve disk and shaft bushings are Teflon. The piston connecting rod is brass and the valve rods are steel wire. A cherry base sets off the display and adds warmth.

The cylinder block is 2" x 3" x 1"   the base is 3 -1/4" by 6- 1/2".   Claire runs quite nicely on 8" -12" of water pressure as measured on an improvised manometer. That is about .3-.4 PSIG . That is breath power folks.  The runner design is an excellent  choice as a starter engine. This engine runs great with no run in or break in. Careful fit and finish allow for a great running demonstration engine.


Plans available as a free download from


Copyright 2007,  Florida Association of Model Engineers and engine builder as noted above, All rights reserved.