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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5/00
Arrangements on vessels of propulsion elements directly acting on water
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B63H5/08
of more than one propeller
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B63H5/10
of coaxial type, e.g. of counter-rotative type
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B63H2005/106
with drive shafts of second or further propellers co-axially passing through hub of first propeller, e.g. counter-rotating tandem propellers with co-axial drive shafts
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