A Comparison of Two Propellers for the Acoustic Research Ship CFAV (Canadian Forces Auxiliary Vessel) Quest,
DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)
Pagination or Media Count:
CFAV QUEST is a specially designed quiet ship used for underwater acoustics research at the Defence Research Establishment Atlantic. A new set of highly skewed propellers was designed in 1979 to meet new acoustic requirements. Model test results on these propellers were presented at the 1980 ATTC. In 1981, full scale trials were carried out on CFAV QUEST with both the original and the new set of propellers. Propulsion trials were conducted on a measured mile course with the propeller shafts instrumented using strain gauges. A set of propeller viewing trials, covering the measurement of cavitation inception and cavitation patterns on the propellers, were also carried out. Development of the cavitation on the blades was photographed and the acoustic performance of the propellers was evaluated. This paper presents results obtained in these trials. Comparison of the two propellers shows that the new propellers exhibit superior cavitation and acoustic performance. Cavitation inception speeds were raised and the amount of cavitation at any given speed was reduced. This was accomplished at no cost in propulsive performance.