Flight test investigation of rotorcraft wake vortices in forward flight.

Details

• Creators:
  Teager, Stephen A. ; Biehl, Keith J. ; Garodz, Leo J. ; Tymczyszym, Joseph J. ; Burnham, David C.
• Corporate Creators:
  Federal Aviation Administration Technical Center (U.S.) ; United States. Department of Transportation. Federal Aviation Administration ; Scientific and Engineering Solutions, Inc.
• Subject/TRT Terms:
  • Wakes
  • Flow
  • Vortices
  • Helicopters
  • Rotary wing aircraft
  • Laser doppler velocimeters
  • Tests
  • Flight tests
  • Boundary layer separation
  • Hazards
  More +
• Publication/ Report Number:
  DOT/FAA/CT-94/117
• Resource Type:
  Tech Report
• Geographical Coverage:
  Alabama ; New Jersey
• Corporate Publisher:
  Federal Aviation Administration Technical Center (U.S.)
• Description:
  This report presents the results of helicopter flight test and wake vortex measurements which were designed to provide data necessary for the assessment of hazards to following aircraft. The tests described in this report were conducted using small probe airplanes and a Laser Doppler Velocimeter for wake vortex measurements during forward-flight helicopter operations. Four helicopters, having weight ranging from 7,600 to 70,000 pounds, were used in the test as the wake vortex generating aircraft. Wake vortex strength and decay characteristics as determined from the flight test results are discussed. In the absence of encounter measurements for the case of hover flight, it is recommended that small airplanes, at the same altitude and downwind of a hovering helicopter, maintain at lease 500 feet of separation.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/12234/dot_12234_DS1.pdf
• File Type:
  [PDF - 17.53 MB]
• Collection(s):
  Volpe Center
• Main Document Checksum:
  urn:sha256:d866cedf4f85f49ff7d50e5faf4b051951a311e8518f833ab3e6c3068a852f8f