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Technical Paper

Propulsion System Optimization for the ATT

1971-02-01
710760
This paper reviews a recent internal study by Pratt & Whitney to define the optimum propulsion system characteristics for a commercial transport designed to fly at Mach 0.95. The impact on aircraft gross weight of propulsion cycle characteristics such as bypass ratio, overall pressure ratio, turbine temperature, nacelle weight, and drag as well as the important criteria of noise is reviewed. ...The impact on aircraft gross weight of propulsion cycle characteristics such as bypass ratio, overall pressure ratio, turbine temperature, nacelle weight, and drag as well as the important criteria of noise is reviewed.
Technical Paper

Lear Fan Propulsion System

1980-04-01
800609
An aircraft propulsion system for Mach .6 flight is being developed which utilizes two turboshaft engines driving a pusher propeller through driveshafts and a combining gearbox.
Technical Paper

Propulsion Education at Carleton University

1993-04-01
931391
The paper gives an overview of the propulsion content of the programs at the undergraduate and postgraduate levels, as offered to students in both Mechanical and Aerospace Engineering.
Technical Paper

A Propulsion System for Orbit-to-Orbit Shuttle

1971-02-01
710770
The program is being conducted at Rocketdyne, a division of North American Rockwell Corporation, under the sponsorship of the Air Force Rocket Propulsion Laboratory under Contract F04611-67-C-0116. This paper summarizes the accomplishments of the program to date, and describes the engine system and its possible application to the orbit-to-orbit shuttle (OOS).
Technical Paper

Ramjet Propulsion for Single-Stage-to-Orbit Vehicles

1977-02-01
771011
Several ramjet propulsion systems are evaluated for future Earth-to-orbit transportation designed for reduced operational cost, reduced loads on payloads, and increased flexibility of launch site and schedule.
Technical Paper

C-5A Propulsion System Installation

1968-02-01
680333
The C-5A propulsion system installation is described and discussed. Induction system, exhaust system, and thrust reverser configurations define the general nacelle concepts.
Technical Paper

Apollo Spacecraft Propulsion Systems

1969-02-01
690704
These crew safety requirements impose many unusual constraints that are not required in launch vehicle or unmanned propulsion system designs. These requirements and their effects on design and operation are discussed and the systems operational experience on Apollo models are presented.
Technical Paper

Propulsion Integration for Military Aircraft

1989-09-01
892234
This paper will identify some of the primary propulsion integration problems for high performance aircraft at transonic speeds, and demonstrate several methods for reducing or eliminating the undesirable characteristics, while enhancing configuration effectiveness.
Technical Paper

Commuter Turboprop Propulsion Technology

1980-09-01
801243
General Electric is conducting a Propulsion Study for NASA as part of the Small Transport Advanced Technology (STAT) program. The General Electric CT7 is used as the current modern turboprop engine baseline.
Technical Paper

Prop-Fan Propulsion -Its Status and Potential

1978-02-01
780995
The prop-fan propulsion system is being investigated as part of the NASA Aircraft Energy Efficiency program which includes both analytical studies and experimental tests.
Technical Paper

Shuttle Ferry Propulsion System

1973-02-01
730928
A unique propulsion system is being developed for the Space Shuttle Orbiter utilizing airbreathing engines to provide a means for horizontal flight testing and ferrying the Orbiter within the contiguous United States. ...The airbreathing engine arrangement which has resulted, while employing conventional propulsion subsystems, still possesses installation problems because of the low ground clearance.
Technical Paper

Military/Commercial Aircraft Propulsion Relationships

1970-02-01
700268
There are future military and commercial propulsion requirements, however, where the anticipated market may not be sufficiently large or firm to provide the basis for a new development, for example, a medium size commercial or military STOL aircraft.
Technical Paper

A Propulsion Device for Spacecraft

2005-10-03
2005-01-3374
A method that exploits certain properties of a recirculating gas has been investigated as a means of achieving a sustained accelerative vector force without either the expulsion of mass from or a reaction against an external mass by the accelerated body. A theory of operation is presented that defines the capabilities and limitations of the method, and which has resulted in functioning prototypes. The prototype devices require only a source of electric power and a means of cooling to achieve an internally generated, externally measurable accelerative vector force that is sustained for as long as power is supplied to the device.
Technical Paper

AST Propulsion Comparisons

1975-02-01
750631
Studies recently completed for NASA show significant improvements in duct heating turbofans and low-bypass turbojets for an advanced supersonic transport. Dual-valve variable-cycle engines (VCE) prove to be noncompetitive; however, an emerging double-bypass dual-cycle VCE concept is reviewed which does indicate range improvements that are possible. It is 1985 technology and would require extensive development. Engine availability in the United States,as important to program success as technology or economics,is discussed. A fan derivative of an improved-technology Rolls Royce Olympus engine is also considered. An interesting case is developed showing that an Olympus fan derivative on a Douglas AST design offers an earlier U.S. SST possibility than heretofore thought possible. This might be important if airline pressure should mount as a result of overwhelming public demand for Concorde supersonic travel.
Technical Paper

The Merlyn Diesel Concept for Propulsion

1987-05-01
871040
General aviation of the middle 1980's has been less than inspiring from a business viewpoint. Numerous aerodynamic innovations have matured, however, little progress has been made in powerplants. Although significant technology exists for powerplant design progress, low demand and product liability concerns have supressed implementation. The Merlyn design represents one of several present efforts to provide a particular technology to address specific needs in the aviation marketplace.
Technical Paper

Single-Engine Propulsion Improvement Through Intercooling

1985-04-01
850894
Continued performance demands make interceding attractive on single-engine turbosupar-charged applications. Intercooling permits power increases which yield significant speed improvements particularly at altitude. Attention paid to ducting as well as cooler sizing results in very effective installations.
Technical Paper

Propulsion Education for General Aviation Aircraft

2002-11-05
2002-01-2926
The requirements of engine test cells and propulsion laboratories for propulsion education will be discussed. A typical versatile propulsion laboratory set-up for testing full-scale aircraft reciprocating engines, gas turbines, as well as small-scale rocket motors will also be presented. ...There are a variety of propulsion packages available for general aviation aircraft including reciprocating engines, small gas turbines, and rotary engines. ...In future, electrical propulsion will be a major contender in this market. The importance of general aviation propulsion education for aeronautical engineers will be addressed.
Technical Paper

ADAM II Propulsion System and Internal Aerodynamics

1967-02-01
670353
The author discusses the ADAM II (Air Deflection and Modulation) propulsion system as it is applied to LTV propulsive wing airplane configurations which house all or part of their propulsion system within the wing surface. ...The author discusses the ADAM II (Air Deflection and Modulation) propulsion system as it is applied to LTV propulsive wing airplane configurations which house all or part of their propulsion system within the wing surface. Briefly mentioned are the original ADAM I configuration and its subsequent development to the present ADAM II, together with a discussion of the characteristics currently used for each of its components such as fan turbine set, gas generator, hot gas ducting, wing mounted turbofans, and mechanical cross shafting. ...The ADAM II concept is applicable to a full spectrum of subsonic aircraft and the propulsion system uses present day state-of-the-art technology which makes the feasibility of its development quite real.
Technical Paper

An Approach to the Evaluation of Propulsion Systems in V/STOL Aircraft

1964-01-01
640236
Wide scope systems studies of V/STOL propulsion were conducted by GE, encompassing the total air vehicle design and its operation in lift, transition, cruise, and STOL modes. ...To determine VTOL propulsion requirements, the author explains the necessity for incorporating the entire air vehicle into the analysis. ...It is felt that the performance indicated necessary by these studies is now attainable by the propulsion industry.
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