| 摘要 |
A variable pitch propeller is fixed to a guide body pivotable about an axis and can be raised above the water surface by its pivoting about the axis. An adjusting device jointly rotating with the hub of variable pitch propeller and positioned on that hub can be set or adjusted without difficulty by a rotatable handle to adjust the pitch of the propeller blades in accordance with the intended travel mode, whereby a detectable fuel saving can be achieved.
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