Liquid Piston Engine

fredymac

CLEARANCE: Top Secret
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Liquid Piston engine. The name seems to be a marketing hook but it may relate to the way fuel/air is injected into the rotary piston as a delivery path to the combustion "nooks" built into the main housing.

They seem to be progressing slowly but steadily and are targeting military/UAV applications as commercial/automotive markets are resistant to new engine architectures and require serious financial backing.

https://www.youtube.com/watch?v=v5fxoEisKxo

https://www.youtube.com/watch?v=QEBydx0MHBo

https://www.youtube.com/watch?v=oNV5OvJm66M

Phase II DARPA contract for a diesel 40HP UAV engine starting at 4:30 mark.
https://www.youtube.com/watch?v=7zCOIZufrgA
 

Arjen

It's turtles all the way down
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At 1:29 it says '4-stroke HEHC cycle' - to me it looks like a 2-stroke cycle. Maybe I misunderstood that first clip?
 
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