Question 327General Subjects - Assistant Engineer
70% to passWhat type of propeller consists of a flat disc set flush with the under surface of the vessel's hull with a number of vertical, rudder like blades projecting from it?
AContra-rotating propeller
BTandem propeller
CHelicoidal propeller
DCycloidal propeller
AI Explanation
The correct answer is D) Cycloidal propeller. A cycloidal propeller consists of a flat disc set flush with the underside of the vessel's hull, with a number of vertical, rudder-like blades projecting from it. This design allows the propeller to provide both thrust and steering, making it a unique type of propulsion system. The other options are incorrect because: A) Contra-rotating propellers use two sets of propeller blades rotating in opposite directions. B) Tandem propellers use two separate propellers aligned one after the other. C) Helicoidal propellers have blades arranged in a spiral or helix pattern.
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