<HTML>Sigh.
A simple steam engine.
Simple to make? simple to run? Few moving parts? Simple to find fuel for?
with a closed system
Practically any steam system can be made a closed system if you have a big enough condesor with enough coolent (air water what ever).
To even start to answer your question the horse power weight efficency etc have to be defined. As a bare minimum what will the engine be powering. From there you may, repeat, may find plans that are usable for your purpose.
Check out
[
www.steamautomobile.com] storeroom section
[
www.lightsteampower.freeserve.co.uk]
Cheers
Mark Stacey
www.cncprototyping.co.nz</HTML>