"WalterM140" wrote in message
...
. As I vaguely remember it that
hydraulic
sytem in a B-17 worked off one engine.

That was the Lancaster, Art.

One of the virtues of the Fortress so far as battle damage went was that
it
relied so little on hydraulics for the flight controls.

Walt

Bomb Bay doors, landing gear and brakes were about all that was hydralically
operated on most US WWII bombers.