I can see many uses for this little beauty ( a much improved, faster, lighter mountain bike moped for example): http://www.gizmag.com/liquidpiston-x-mini-engine/34747/
Liquid Piston x Mini Engine
The Ultralight Hiker
Ultralight hiking, backpacking, bushwalking, deer hunting, canoeing, pack rafting, tips, trails, adventures, gear, reviews...Over 1600 posts & 70 years' experience.