US PATENT SUBCLASS 440 / 68
.~.~ Hull channel

Current as of: June, 1999
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440 /   HD   MARINE PROPULSION

49  DF  SCREW PROPELLER {12}
66  DF  .~ Having means to control flow around propeller {3}
68.~.~ Hull channel {1}
69  DF  .~.~.~> With open bottom

DEFINITION

Classification: 440/68

Hull channel:

(under subclass 66) Device wherein the means to control the flow around the propeller is an elongated passageway with an inlet and an outlet along the longitudinal axis of the hull, the propeller being located within or proximate the outside of the passageway but always acting at least in part on water exteriorly of the passageway.