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This will give you a better idea on a HPOP and how it works.
Same concept except reversed.
This pump in the video takes oil and makes horse power, while we take horse power and pump oil.
That one is a variable axis, while our HPOP's are fixed swashplates to keep them smaller and simpler.
But you'll get a good learn on the internals of an HPOP watching this.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.