TRANSMISSION STUDY FOR TANDEM-ROTOR SHAFT-DRIVEN HEAVY-LIFT HELICOPTERS

Abstract

Mechanical drive systems for heavy-lift tandem-rotor helicopters were studied. Three- and four-engine configurations were analyzed. Configurations included aft-mounted and fore- and aft-mounted engines, single and dual drive systems, and high-mounted and low-mounted aft planetaries. Weights were estimated. Problems of gear surface durability, multiengine control, and over- running clutches were defined. The effects of increased gear tooth bending fatigue strength, higher bearing capacity, super critical speed shafting, and the use of titanium and improved ferrous metals were evaluated. In the more significant factors, the satisfactory solution of the heavy-lift helicopter drive system lies within the current state-of-the-art.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1965
Accession Number
AD0622586

Entities

People

  • John Mack

Organizations

  • Boeing Rotorcraft Systems

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Army Aviation
  • Bearing Capacity
  • Design Criteria
  • Fuselages
  • Geometry
  • Helicopters
  • Manufacturing
  • Payload
  • Resonant Frequency
  • Sea Level
  • Test And Evaluation
  • Turbines
  • Turboshaft Engines
  • Weight
  • Weight Reduction

Fields of Study

  • Engineering

Readers

  • Aerodynamics/Aeronautics.
  • Aerospace Engineering
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).