Drag and Propulsive Characteristics of Air-Cooled Engine-Nacelle Installations for Large Airplanes
Abstract
An investigation is in progress in the NACA full-scale wind tunnel to determine the drag and the propulsive efficiency of nacelle-propeller arrangements for a large range of nacelle sizes. In contrast with the usual tests with a single nacelle, these tests were conducted with nacelle-propeller installations on a large model of a four-engine airplane. Data are presented on the first part of the investigation, covering seven nacelle arrangements with nacelle diameters from 0.53 to 1.5 times the wing thickness. These ratios are similar to those occurring on airplanes weighing from about 2O to 100 tons. The results show the drag, the propulsive efficiency, and the over-all efficiency of the various nacelle arrangements as functions of the nacelle size, the propeller position, and the airplane lift coefficient. The effect of the nacelles on the aerodynamic characteristics of the model is shown for both propeller-removed and propeller-operating conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 17, 1939
- Accession Number
- ADA800844
Entities
People
- Abe Silverstein
- Herbert A. Wilson Jr.
Organizations
- Langley Research Center