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The WW2 Fighter with a Jet Stuffed in Its Tail - Ryan FR Fireball

The unconventional Ryan FR Fireball was the only fighter in operational service to be powered by both piston and jet engines: ...
The Magazine

Agitator Impeller Hydraulic Force in Mixing Vessels

For example, if the shaft extension to the impeller location ... so the value of F D in a center-mounted vertical application should theoretically be zero in laminar flow. Of course, there will still ...