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FUEL SYSTEMS.
    The trend in commercial aircraft has been to locate separate fuel tanks out and away from the fuselage, either underneath or on top of the upper wing in gravity feed fashion or on top or underneath the lower wing and fed to motor with a fan driven fuel pump.
    With the latest type military aircraft, pressure systems are being avoided and fan driven Vickers gasoline centrifugal pumps are being installed on most of the machines in conjunction with the gravity auxiliary system.
    On multimotored airplanes, it is desired as far as possible to have independent fuel supply system for each power plant, working independently or in unison at the control of the pilot.  The separate gravity tanks are also at the control of the pilot.  In these large multimotored airplanes, auxiliary direct feed hand pump of large caliber are installed within easy access of the pilot so as to permit filling of the gravity tanks from the main service tanks in case the fan driven gasoline pump system should fail.

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