A NOTE ON HIGH LEVEL TURBULENCE ENCOUNTERED BY A GLIDER

Abstract

The first gusts which were encountered after a smooth and stead y flight in the stationary lee wave of the Sierra Nevada range were measured with an accelerometer. Reduced gust velocities were derived from the effective gust velocity, and a true gust velocity of over 70 fps was indicated at 38,000 ft. Estimated effective gust velocities of 40 fps were encountered between 32,000 and 40,000 ft. Speed variations as indicated in plots of lapse-time pictures were partly attributed to very strong variations of the horizontal wind component. A 300-mb map indicated that the flight was made near a jet-stream center and appeared to confirm the view that jet-stream conditions are favorable for high-level turbulence. Lapse-time pictures of the cloud formation indicated that the turbulence elements are not created by the mountain range but are disturbances traveling through the mountain range but are disturbances traveling through the mountain wave.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1952
Accession Number
AD0012012

Entities

People

  • J. Kuettner

Organizations

  • Air Force Cambridge Research Laboratories

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Defense
  • Air Force
  • Aircraft Design
  • Aircrafts
  • Delphi Method
  • Geophysics
  • Jet Streams
  • Military Research
  • Mountains
  • Soil Stabilization
  • Turbulence
  • Wind

Readers

  • Aviation Science / Aeronautics.
  • Fluid Dynamics.
  • Geotechnical Engineering.

Technology Areas

  • Autonomy