5 Stage Axial-Flow Micro Turbine - The Worlds Most Advanced Micro Jet.

Here it is, the world's most advanced micro jet. about 4.5" diameter and
puts out roughly 100 lbs of static thrust. This is the 5 stage Bladon
turbine. Can it fit in an rc jet? You bet it can. With twice the
thrust. Can people afford it, well, pretty sure some can, but not many.
All in all, this is an engineering marvel. The Bladon brothers took an
axial-flow turbine and scale it down to rc jet standards. Simply
Marvelous.