Building Instructions for Steam Engine
by Dr. C. S. Soh

It seems that everyone who has played around  with pneumatics for some time would attempt to build a pneumatic engine. So there a number of  different models around. One that has intrigued me is the yellow Lego Technic "Steam" Engine by Per Arne Rikvold. I have been attempting to replicate it but the single picture and Quicktime movie at his site didn't provide sufficient information to be able to do so. Fortunately I was able to contact him and he has kindly provided additional photos and detailed building instructions from which I was able to build his engine. Here are pictures of my implementation of Per's engine.

per-1crp320.jpg (25231 bytes)

Lego Technic "Steam" engine by Per Arne Rikvold
per11crp300.jpg (17547 bytes) per13crp300.jpg (17127 bytes)
Front view Crankshaft end
per21crp300.jpg (19149 bytes) per15crp320.jpg (19796 bytes)

Cylinder end

Back view
per18crp300.jpg (11650 bytes) per23-300.jpg (14042 bytes)

Bird's eye view

Cylinder mounting
per09-320.jpg (20872 bytes) per19-320.jpg (24132 bytes)

Pneumatic valve mechanism

Gearbox and governor
It is such an interesting and unusual design that I'm sure there are others who may want to build it as well. So I thought it would be useful to do up LDraw instructions to help them.