Turning Characteristics of U.S. Coast Guard Icebreaker M-5

• Main Author: Porricelli, J. D.
• Other Authors: MICHIGAN UNIV ANN ARBOR DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING
• Format: Text
• Language: English
• Published: 1967
• Subjects: Marine Engineering; *ICEBREAKERS; MANEUVERABILITY; WOOD; SCALE; SHIP MODELS; MODEL TESTS; REMOTE CONTROL; MULTIPLEXING; RADIO EQUIPMENT; ELECTRIC PROPULSION; MODEL BASINS; COAST GUARD RESEARCH; COAST GUARD; ELECTRIC MOTORS; MARINE RUDDERS; MARINE PROPELLERS; HETEROAUXIN; Icebreaker
• Online Access: http://www.dtic.mil/docs/citations/AD0845565; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0845565

The turning characteristics of the Proposed Parent Hull Form M-5 Polar Icebreaker for the U. S. Coast Guard were determined utilizing a radio controlled, free-running model in the University of Michigan Maneuvering Basin. This particular design incorporated a flapped, single, centerline rudder with a triple screw arrangement and appears to provide acceptable turning characteristics for an icebreaker. The model was constructed of wood to a scale of 1 to 48. It was self contained and suited for a radio control of rudder angle and propeller RPM. Control was continuously variable by a set of storage batteries and a fractional horsepower direct current motor. A single motor drove an idler shaft assembly which in turn was mechanically connected to the three propeller shafts. Thus, all three shafts turned in their prescribed manner of rotation at the same speed. The model was self contained and suited for radio control of rudder angle and propeller RPM. The radio control system is a three channel time shared multiplex system employing pulse width and pulse position modulation. (Author)