ANALYSIS OF FLAPPED RUDDER GAP EFFECTS

A force and moment dynamometer was constructed to measure experimentally the effects of flap gap variation on the characteristics of an NACA Series 66 Modified airfoil section configured as a 30% flapped all movable rudder. The investigation revealed the effect on rudder characteristics of an open or closed gap and its width to be dependent upon the rudder's angle of attack and flap angle. Under certain circumstances an open gap is beneficial for performance and under others it is detrimental. Theoretical prediction of the open and closed gap lift coefficient for a 5 degree flap angle at a 10 degree angle of attack was verified except for its magnitude. The experimental value is significantly smaller than the theoretical value.

• Corporate Authors:

  Massachusetts Institute of Technology

  Department of Ocean Engineering, 77 Massachusetts Avenue
  Cambridge, MA  United States  02139
• Authors:
  • Champlain, J G
• Publication Date: 1971-5

Subject/Index Terms

• TRT Terms: Aerodynamic lift; Force; Performance; Rudders
• Old TRIS Terms: Flapped rudders; Lifting surface theory; Rudder forces
• Subject Areas: Design; Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00034679
• Record Type: Publication
• Source Agency: Massachusetts Institute of Technology
• Files: TRIS
• Created Date: Sep 29 1973 12:00AM