Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B63
SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
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B63H
MARINE PROPULSION OR STEERING
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1/00
Propulsive elements directly acting on water
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B63H1/12
with rotation axis substantially in propulsive direction
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B63H1/28
Other means for improving propeller efficiency
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B63H2001/283
Propeller hub caps with fins having a pitch different from pitch of propeller blades, or a helix hand opposed to the propellers' helix hand
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