Design of Supercavitating Propellers for a Racing Boat

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  • 競艇用プロペラへのスーパーキャビテーティング・プロペラの応用
  • キョウテイヨウ プロペラ エ ノ スーパーキャビテーティング プロペラ ノ オ

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Abstract

This paper describes the successful application of a theoretical supercavitating propeller design method to racing boat propellers. Two propellers were designed, manufactured and tested on a newly developed full-scale boat.<BR>The first one, the SC-2 propeller, was designed at an advance ratio of 1.371 and a cavitation number of 0.3, and tested at the Kiryu racing site together with two target propellers, the SC-1 propeller which was previously designed by a Bp-chart method, and a commercial racing boat propeller, the “Record Propeller”. No remarkable difference in the measured speeds of the racing boat equipped with each propeller was observed at full throttle condition, while the performance of the SC-2 propeller was superior to that of the SC-1 propeller at the prescribed design conditions in tests in two cavitation tunnels.<BR>The second propeller, the SC-3 propeller, was designed by changing the propeller diameter from 165 mm to 175 mm to make the diameter more optimum at an advance ratio of 1.197. The blades of this propeller were designed to be as thin and narrow as possible to get the optimum lift-drag ratio at each radial position within the limitation of having the same strength requirement as that for the SC-1 propeller. At the propeller root, aerofoil blade sections were applied from the view points of strength and efficiency.<BR>The second propeller was also tested at the racing site with the SC-1, the SC-2 and another famous commercial propeller, the “Rolla Propeller”. The racing boat with the SC-3 propeller ran at the highest speed of about 97 km/h in the full-scale test. At the racetrack, a running test around two turning buoys 300 m apart gave the following results ; the racing boat with the SC-3 propeller completed a lap within 33.8 seconds which was 1.4 seconds faster than that with the “Rolla Propeller”. The test in cavitation tunnels endorsed the higher performance of the SC-3 propeller than those of other propellers.

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