Accession Number:

AD0900263

Title:

Technical Evaluation, Boeing-Vertol Model 347 Advanced Technology Helicopter

Descriptive Note:

Final rept. 28 May-12 Aug 1971, on Phase 1

Corporate Author:

ARMY AVIATION SYSTEMS TEST ACTIVITY EDWARDS AFB CA

Personal Author(s):

• Yamakawa, George M.
• Steinmetz, Alton G.
• Greenland, Richard L.
• Hendrickson, Donald E.

Report Date:

1972-01-01

Pagination or Media Count:

187.0

Abstract:

The Model 347, a derivative of the CH-47 transport helicopter, was tested. Performance, handling qualities, vibration and noise characteristics were evaluated to determine the improvements provided by incorporation of advanced technology systems in a large tandem-rotor transport helicopter. Compliance with the provisions of the contract statement of work and with military specifications, MIL-H-8501A and MIL-A-8806A, was determined. Several shortcomings identified during the testing were corrected by the contractor after the testing was completed. The effects of these corrections were evaluated during additional testing conducted on 11 and 12 August 1971. Level flight performance and out-of-ground-effect hover performance were significantly improved over that of the CH-47C helicopter. The excellent static longitudinal stability characteristics enhanced the mission capability of the aircraft. The steering and glide-path modes of the automatic flight path control system worked satisfactorily and reduced the pilot workload in instrument flight conditions. Cockpit noise and vibration characteristics were noticeably improved over those of the CH-47C.

Descriptors:

• *HELICOPTERS
• ARMY AIRCRAFT
• COCKPITS
• FLIGHT CONTROL SYSTEMS
• FLIGHT INSTRUMENTS
• FLIGHT TESTING
• GLIDE PATH SYSTEMS
• HOVERING
• HUMAN FACTORS ENGINEERING
• INSTRUMENT FLIGHT
• MILITARY REQUIREMENTS
• PERFORMANCE(ENGINEERING)
• STABILITY
• STEERING
• VIBRATION

Subject Categories:

• Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE