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Technical Paper

Military Operation Of Helicopters

1951-01-01
510134
The opinions or assertions contained herein are the private ones of the writer and are mot to be construed as official or reflecting the views of the Navy Department or the naval service at large.
Standard

Aerospace Military Aircraft Hydraulic System Characteristics

2023-04-26
CURRENT
AIR1899A
This SAE Aerospace Information Report (AIR) has been compiled to provide information on hydraulic systems fitted to the following categories of military vehicles. Attack Airplanes Fighter Airplanes Bombers Anti-Sub, Fixed Wing Airplanes Transport Airplanes Helicopters Boats ...Attack Airplanes Fighter Airplanes Bombers Anti-Sub, Fixed Wing Airplanes Transport Airplanes Helicopters Boats
Technical Paper

The Future Markets and Implications of Crane Helicopters

1970-02-01
700284
The first crane, designated S-60, was designed to carry six tons of cargo, was powered by two reciprocating engines, and evolved from the military S-56. It promised unlimited versatility in transporting suspended loads for industrial, commercial, and military operations. ...It promised unlimited versatility in transporting suspended loads for industrial, commercial, and military operations. With the experience and design information provided by the S-60, a larger version was developed. ...Substantial markets exist for crane helicopters in four categories of industry: petroleum, shipping, construction, and electric power transmission.
Technical Paper

Application of Large Helicopters to Commercial Transportation

1978-02-01
780537
Because costs prohibit certifying a new large helicopter, updating and adapting existing machines, developed under military programs is a very desirable approach. ...The helicopter's unique ability to transport large work crews and heavy equipment to remote areas quickly, cheaply, and efficiently will become increasingly important and useful as easily accessible resources are depleted. ...The introduction of large helicopters into operation will result in increased capabilities and expanded application of helicopter transport.
Technical Paper

ROTOR TECHNOLOGY FOR NEW GENERATION HELICOPTERS

1975-02-01
751106
Production of these aircraft for the U. S. Military has just about ended. A whole new family of helicopters is in development now, however, aimed at production from 1977 on (Fig. 2). ...THE NEW GENERATION All of the helicopters now in production in the United States have been in production for at least ten years (Fig. 1). ...These specific designs are motivated by new military requirements and increased commercial demands. However, their reason for being - the reason new aircraft are being developed in place of increased numbers of the older designs - is that new technology now permits development of significantly more cost effective aircraft.
Technical Paper

Military Aerospace Technical Development in Australia

1987-11-13
872426
New equipment being acquired by the Australian Defence Force, including the F/A-18 Hornet fighter aircraft, Blackhawk helicopters and their support equipment, is as modern as that of most larger nations. Local industry and research and development laboratories have a proud history of producing Service equipment with varying degrees of design, development and production or assembly which has provided sound defence support. ...This paper identifies the requirements for and strengths of Australia's military aerospace technologies. The current economic climate facing the industry lays increased emphasis on competitive commercial relationships with defence customers and on industry enterprise. ...Mechanisms exist in international co-operation and collaborative programmes amongst others to foster effective development of an industry capable of supporting the required level of military technology. The importance of recognizing the current situation is stressed as innovative plans are developed for the future of aerospace in Australia.
Technical Paper

Heliports and Helicopters Where Have They Been and Are They Coming Back

1980-04-01
800740
The Federal Aviation Administration must now accept this fact and change their thinking process from airports and airplanes to heliports and helicopters, due to this one difference: “An airplane lands and then stops, while a helicopter stops and then lands.” ...Urban heliports and commuter helicopters are no longer a dream of the future, but are in fact a reality. The Federal Aviation Administration must now accept this fact and change their thinking process from airports and airplanes to heliports and helicopters, due to this one difference: “An airplane lands and then stops, while a helicopter stops and then lands.”
Technical Paper

Survivability Considerations in the Design of Helicopters

1969-02-01
690708
Major survivability considerations in the design of helicopters are reviewed, and the underlying philosophy of approach is presented. Identification of vulnerability problems is based on lessons learned in Vietnam.
Technical Paper

Matching the Characteristics of Helicopters and Shaft-Turbines

1954-01-01
540256
A DETAILED analysis of the weight-saving possibilities of shaft-turbine installations on helicopters is presented in this paper, which won the 1953 Wright Brothers Medal for its authors. ...They also discuss helicopter flight characteristics and how they are related to shaft-turbine power characteristics. ...Finally, they propose some methods of obtaining better matching characteristics between helicopters and shaft-turbines.
Technical Paper

Technology for Advanced Helicopters

1987-12-01
872370
Helicopters have been under active development for the last 50 years. The earlier years were characterized by configuration development and demonstration of capabilities, and the latter 25 years have been characterized more by pressing against the fundamental barriers of ideal performance, compressibility, and materials. ...This paper reviews the trends that have preceded today's status and concludes that helicopter technology still has opportunity for significant growth ahead.
Technical Paper

The Control of Turboshaft Engines in Helicopters

1965-02-01
650014
Written from the point of view of the helicopter constructor, this paper attempts a comprehensive review of the experience accumulated by airframe, engine, and control systems designers in the United Kingdom in the course of developing a wide variety of first generation turbine engined helicopters. ...Written from the point of view of the helicopter constructor, this paper attempts a comprehensive review of the experience accumulated by airframe, engine, and control systems designers in the United Kingdom in the course of developing a wide variety of first generation turbine engined helicopters. Some experimental results are examined to illustrate and define the requirements for future engine control systems, and to show that the handling characteristics of free power turbine engines can be improved to equal the best characteristics previously experienced with fixed shaft turbines.
Technical Paper

Shaft Gas Turbines For Helicopters

1956-01-01
560033
THIS paper on helicopter gas turbines is divided into two parts. The first compares the performances of two helicopters, one powered with a two-shaft free turbine and the other with a single-shaft fixed turbine. ...The first compares the performances of two helicopters, one powered with a two-shaft free turbine and the other with a single-shaft fixed turbine. ...Part one of the paper discusses helicopter performance advantages arising from the flexibility of the free turbine. Also, several modes of helicopter operation for each turbine are considered in two flight plans.
Standard

CONCURRENT DESIGN OF ENGINES AND SPECIFICATIONS OF STARTING SYSTEMS FOR HELICOPTERS

2020-01-31
CURRENT
AIR1296
It is recommended that all helicopter engine development programs include an evaluation of engine starting requirements. The evaluation should include starting requirement effects on helicopter weight, cost, and mission effectiveness. ...The evaluation should include starting requirement effects on helicopter weight, cost, and mission effectiveness. The evaluation should be appropriate to the engine stage of development.
Technical Paper

Nodalization Applied to Helicopters

1973-02-01
730893
The immediate application is to eliminate helicopter fuselage vibration; however, because of its generality, it can be used wherever conventional isolators are used in isolating a limited range of vibration frequencies.
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