Wind-Tunnel Tests of Eight-Blade Single - and Dual - Rotating Propellers in the Traction Position

Abstract

Tests of 10-ft. diameter, eight-blade, single - and dual - rotating propellers were conducted in 20-ft propeller research tunnel. Propellers were mounted at front end of a streamline body in spinners that covered hubs and parts of shanks. Effect of a symmetrical wing mounted in slipstream was investigated. Blade-angle settings ranged from 20 Degrees to 65 Degrees. Results indicated that dual rotation resulted in gains of from 1 to 8% in efficiency over single rotation for eight-blade propellers, but presence of a wing reduced gain about one-half. Greater power absorption caused by dual rotation over flight range and higher efficiency or thrust for range of take-off and climb was indicated.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1941
Accession Number
ADA800612

Entities

People

  • David Biermann
  • W. H. Gray

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Aeronautical Laboratories
  • Air Force
  • Blades
  • Buildings And Structures
  • Efficiency
  • Physical Properties
  • Propeller Blades
  • Propellers
  • Rotation
  • Slipstream
  • Test Facilities
  • Traction
  • Wind Tunnel Tests
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.