Accession Number:

ADP006253

Title:

The Development of Very Thick Multi-Foil Wings for High Speed, Powered Lift Transport Aircraft Applications,

Descriptive Note:

Corporate Author:

BOEING OF CANADA LTD DOWNSVIEW (ONTARIO) DE HAVILLAND DIV

Personal Author(s):

Report Date:

1990-12-01

Pagination or Media Count:

20.0

Abstract:

Motivation for the development of high speed multi-foil wings began with the Boeing Canada, de Havilland Division Powered Lift Augmentor-Wing Research Aircraft of the 1970s. This was a low speed, Ultra-Short Takeoff and Landing USTOL demonstrator aircraft program, which used a blown ejector multi-foil flap at the trailing edge of a high aspect ratio wing to provide supercirculation lift with a significant augmentation of thrust effective reduction of drag. While the initial goal for the development of the multi-foil section was to simplify the aerodynamicpropulsion systems integration of the powered lift system for high speed flight, several aerodynamic advantages also accrued relating to the powerful control of form drag exhibited by the section. The paper briefly discusses the theoretical development of multi-foils between 18 and 30 thicknesschord and presents results from high Reynolds number, high speed, two-dimensional and three-dimensional tunnel tests on foils up to 24 thicknesschord ratio. Both blown and unblown characteristics of the foils are reviewed. The integration of these multi-foil sections into high speed advanced USTOL transport aircraft studies using the ejector flap concept has led to the potential for very efficient cruising transport aircraft with USTOL capability using only the thrust required for cruise. Finally, several other potential applications for thick multi-foil sections are briefly discussed.

Subject Categories:

  • Transport Aircraft
  • VSTOL

Distribution Statement:

APPROVED FOR PUBLIC RELEASE