1. Home
  2. TRID
  3. View Record
https://www.nationalacademies.org/trb/events

SOME EXPERIMENTS ON EFFECT OF A PROPELLER ON RUDDER FORCES IN SHALLOW WATER

To provide basic data required to predict manoeuvring motions in shallow water, the author carried out some experiments concerning propeller-rudder interaction in water of finite depth. The tests were conducted utilizing a propeller-rudder system with the absence of the ship body. Normal forces on a rudder were measured by changing drift angle, propeller loading and water depth. Adopting the so-called MMG mathematical model describing manoeuvring motions, a theoretical calculation of rudder normal forces in shallow water is made. The shallow water effect is evaluated through infinite images which are arranged below the fluid bottom and above the free surface. Calculated values of the rudder forces agree well with the experimental results, when the rudder is set in open water. However, with regard to the rudder behind the propeller, both agree qualitatively. Coefficients of flow straightening caused by the propeller are obtained from measured results of the rudder forces in oblique flows. As a result, it is found that the water depth has a considerable influence on the flow straightening effect. The values of the coefficient will increase as the depth of the water decreases.

  • Supplemental Notes:
    • J Kansai Soc Naval Arch, n 222, Sept 1994, p 107 [9 p, 11 ref, 2 tab, 14 fig]
  • Authors:
    • Yumoro, A
  • Publication Date: 1994

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00709792
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM