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According to an online sizing calculator
35hp at 5000psi = 10gpm
The engine would definitely have to be powerful enough to maintain speed on its own.
It wouldn't be efficient, but I would likely be able to be a good slow steady crawler.
The reason I prefer hydraulic to electric is that when you bind up your drive train and stall the motor. The electric motor draws way much more current when stalled greatly increasing your chances of burning out your motor controller, batteries, motor, wiring etc. Burn it out with no spare and your rig gets dragged out, which so far I have been able to avoid.
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