Jet backpack

> >What is the smallest jet engine that has been built and what is its
> >power?  
> 
> the smallest jet turbines made are about 6" long, 4" in diameter. have
> about 10 - 15 lbs thrust and use about 60 litres per hour.

No, a company called MDOT (can't seem to find it anymore) made a jet
engine the size of a chicken egg (1.75" diameter, IIRC, and 2.5"
long). It generated 1 to 1.5lbs of thrust. I worked with this engine
for my final undergrad design project, so this engine was available
c1997. I suppose the company has folded, been absorbed, or renamed in
the intervening years. Their target market was US DoD micro-drones.

Mike Miller, Materials Engineer