Effects of Antispin Fillets and Dorsal Fins on the Spin and Recovery Characteristics of Airplanes as Determined From Free-Spinning-Tunnel Tests
Abstract
The effects of anti spin fillets and dorsal fins on the spin and recovery characteristics of airplanes have been determined from an analysis of the results of spinning investigations of a large number of models tested in the Langley l5-foot and 20-foot free-spinning tunnels. The analysis indicated that when anti spin fillets were installed on an airplane, the fuselage area below the fillets became more effective in damping the spinning rotation (higher tail-damping ratio). Whether or not fillets satisfactorily improved recovery characteristics of a given design depended, with few exceptions, upon the tail-damping power factor of the design with fillets installed and upon the mass distribution and relative density of the airplane. The results indicated that dorsal fins generally had little effect on spin and recovery characteristics.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1948
- Accession Number
- ADA380885
Entities
People
- Ira P. Jones Jr
- Lawrence J. Gale
Organizations
- National Aeronautics and Space Administration