On Sun, 05 Oct 2008 16:12:09 -0700, Tim Wescott
wrote:



Most DC permanent-magnet motors have fairly low torque when there is no
current flowing, so in an application like this you could just leave
them connected.

I would expect a starter motor would be the same. You'll have some
losses, but not that bad.

Just as speed * force = power, and rotary speed * torque = power, flow *
pressure = power. You could find the absolute maximum power to the
wheel fairly easily by finding the power in a 6GPM, 2000psi flow.

That's about 5220 watts or 7.0 HP.