CONTRAROTATING AND TANDEM CLT PROPELLERS

The generalization made to the new momentum theory with the aim of designing CLT propellers working in a velocity field with both axial and tangential components (nozzle propellers, contrarotating propeller, etc) has allowed the authors to design contrarotating and tandem propellers. In principle the merits of tandem propellers are similar to those of contrarotating propellers: lower Bp coefficient than the one corresponding to an alternative single propeller. However, tandem propellers have the disadvantage derived from the higher hydrodynamic pitch angle of the second propellers. Both contrarotating and tandem propellers can be designed with conventional or CLT blades. Theoretical justifications explaining the hydrodynamic performance of contrarotating propellers are presented in the paper. A comparison among the expected performances of a high block coefficient ship alternatively fitted with a single propellers, a set of contrarotating propellers and a set of tandem propellers, both conventional and CLT versions in all cases, is also included.

• Supplemental Notes:
  • Propellers/Shafting '94 Symposium; 20-21 Sept 1994; Virginia Beach, VA, USA. Sponsored and Publ by SNAME, USA. Pprs. Ppr no 6 [31 p, 33 ref, 4 tab, 11 fig]
• Authors:
  • Perez-Gomez, G
  • Gonzalez-Adalid, J
• Publication Date: 1994

Language

• English

Subject/Index Terms

• TRT Terms: Contrarotating propellers; Propellers
• Old TRIS Terms: Propeller efficiency; Tandem propellers; Tip loaded propellers
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00717698
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Mar 4 1996 12:00AM