A Transonic Propeller of Triangular Plan Form

Abstract

An isosceles triangle twisted into a screw surface about its axis is proposed as a propeller for transonic flight speeds. The purpose is to attain the drag reduction associated with large sweepback in a structurally practicable configuration. A mathematical theory for such a propeller is presented. Calculations taking account of wave and skin-friction drag indicate a net efficiency of the order of 80 percent at Mach number 1.1. A 12-foot propeller is estimated to be able to absorb 18,500 brake horsepower at 840 miles per hour at sea level.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1947
Accession Number
ADA801353

Entities

People

  • Herbert S. Ribner

Organizations

  • National Advisory Committee for Aeronautics

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Aeronautics
  • Aircrafts
  • Angular Momentum
  • Aspect Ratio
  • Drag
  • Flight Speeds
  • Flow
  • Leading Edges
  • Mach Number
  • Momentum
  • Pressure Distribution
  • Sea Level
  • Skin Friction
  • Trailing Edges
  • Two Dimensional
  • Two Dimensional Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Marine Hydrodynamics