Flight Measurements of the Longitudinal Stability, Stalling, and Lift Characteristics of an Airplane Having a 35 deg Sweptback Wing Without Slots and With 40-Percent-Span Slots and a Comparison With Wind-Tunnel Data
Abstract
Flight measurement were made at low speeds to determine the static longitudinal stability, stability, and lift characteristics of an airplane having a wing swept back 35c at the quarter-chord line. The airplane was tested without slots on the wing and with slots%Us which extended from 8O percent to 80 percent of the semispan of the sweptback-wing panels measured from the inboard end. The longitudinal stability of the airplane with the flaps up was high with or without slots throughout the speed range tested. With the flaps down the longitudinal stability was high at moderate speeds, but near the stall the stability of the airplane was neutral or slightly negative. The pilot had no serious objections to the neutral longitudinal stability present near the stall because he could easily control pitching with the elevator. The slots increased the stalling speed and therefore reduced the speed range over which the neutral or slightly negative stability was present.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1948
- Accession Number
- ADA380764
Entities
People
- J. P. Reeder
- S. A. Sjoberg
Organizations
- National Aeronautics and Space Administration