Originally Posted by trip

Yes don't get wrapped up in turbofan vs turbojet, there're basically the same with the exception of the turbofan having a larger front compressor fan section that passes excess compressed air around and outside of the turbines "hot" section.
A turbojet sends the majority of it's compressed air through the hot turbine section and straight out of the tailpipe.
Turbo-props are smaller jet engines with propellors attached to produce the power/thrust required.

I could envision Sam experimenting with the new fuel and compressing it then igniting it out of a nozzle creating a massive plume of fire and energy that's waiting to be harnessed in the new turbojet engines to come.

The Humming bird must be very light and nimble so it will require new materials to construct. Experiment with a honeycomb structure patterned from beehive material. This new material will be covered with golden hued aluminum foil stretched taught across the honeycomb interior (this is current advanced composite design used today). This will allow the wing to flex and bend without damage under the stresses imposed with the high powered turbines embedded within....

The Hummingbirds wings could rotate at fuselage attach point allowing the thrust to be directed straight down enabling pure VTOL, or vertical takeoff and landing and mid-air hover. BadAZZ!!