You might have already seen this, but in the June Scientific American
Magazine,(page 30) the is a photo of the smallest rotary engine- the size of
a penny. It's a single rotor.

The Engine That Might

Carlos Fernandez-Pello and his colleagues at the University of Californis at
Berkeley have been boosting the output of their penny- size rotary internal
combustion engine- the smallest ever to deliver continuous power. This mini
engine, which runs on high energy liquid hydrocarbon such as butane or
propane, produced four watts of electricity as of April, up from 0.7 watt in
February. A refined, more powerful version might replace batteries in laptop
coputers and ther other portable devices. Furthermore, a version fashioned
out of silcon could someday shrink  the engine down
 to the size of a pinhead.

Brian Trubee

Yep we have a picture. I also think  a model airplane rotary with a high
speed alternator would make a good light weight gen set. Something
you could carry around in a briefcase.

Paul Lamar
 
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