Green revolution
Is this the enviromentally friendly powerplant of the future?
Yes, we know this claim's been made before, yet here it is again.
There's a possibility that one day, heavy trucks and transit buses
could be powered by the enchantingly simple engine you see here. Right
now, the Green Revolution Engine is used in test applications, such as
powering a rotary lawnmower by burning propane. If it proves to work,
however, look out.

The Green Revolution Engine is the product of Cyclone Power
Technologies, based in Pompano Beach, Florida. Unlike just about every
other engine intended for automotive use, it operates on the principle
of external combustion. Fuel, meaning virtually any combustible liquid
or gas, is burned to heat its working fluid, de-ionized water, which
moves either a turbine or pistons once it becomes a pressurized vapor.

Since the water lubricates the engine without causing corrosion, no
oil pump is needed. The basic combustion process is heat-regenerative.
As a result, its developers say, its fuel consumption and emissions
are both considerably lower than those associated with normal small,
internal-combustion engines used for mowers or other power tools.
That's the popular rub that lawn care produces more emissions than the
Los Angeles freeways at a dead stop, and the like.

Cyclone was founded by Harry Schoell, a self-taught engineer and
marine architect who won his first patent for a hull design when he
was 22. The Green Revolution Engine won a patent in 2006, and the U.S.
Postal Service licensed it earlier this year for possible use in its
vast fleet of delivery trucks. Cyclone has predicted that a multi-
cylinder radial version could viably supplant current diesels in
larger rigs. Time will tell.

http://www.cyclonepower.com/cyclone_engine.html

Patrick