Flight Investigation of Boundary-Layer and Profile-Drag Characteristics of Smooth Wing Sections of a P-47D Airplane

Abstract

In Mach range of 0.25 - 0.69, boundary-layer measurements were made on upper wing surface at 25% semi-span, pressure-distribution measurements made on upper surface at 63% semi-span, and wake surveys made at 63% semi-span. The minimum profile-drag coefficient of 0.0062 was indicated for smooth section at 63% semi-span. Critical mach number was exceeded by 0.04, but no compressibility shocks appeared. In slipstream, boundary layer transition occurred as far back as 20% chord on upper surface at low lift coefficients.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1945
Accession Number
ADA800595

Entities

People

  • John A. Zalovcik

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautics
  • Aircrafts
  • Airplanes
  • Boundaries
  • Boundary Layer
  • Boundary Layer Transition
  • Coefficients
  • Compressive Properties
  • Flow
  • Free Stream
  • Mach Number
  • Measurement
  • Pressure Distribution
  • Reynolds Number
  • Slipstream
  • Static Pressure
  • Transitions

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.