Stratified Charge Rotary Engines for Aircraft

1988 ◽  
Author(s):  
Robert E. Mount ◽  
Gaston Guaroa
Keyword(s):  
Aircraft Engine ◽  
Unmanned Aircraft ◽  
General Aviation ◽  
Current Status ◽  
Stratified Charge ◽  
Rotary Engine ◽  
Rotary Engines ◽  
Substantial Progress ◽  
Long Endurance ◽  
Rotary Wing

Substantial progress has been made over the past two years in the technological status and production aspects of Stratified Charge Rotary Engines, a new propulsion technology for aircraft of the 1990’s. A 400 HP aircraft engine, designed in cooperation with Avco-Lycoming (during late 1986) is currently undergoing testing at John Deere’s Rotary Engine Division. Current status and design features are reported in this paper and related to overall research and technology enablement efforts toward several families of advanced liquid cooled, turbocharged and intercooled engines over a wide power range for commercial general aviation. Capabilities for high altitude, long endurance, military unmanned aircraft missions are examined. Application to fixed and rotary wing aircraft are planned.

scholarly journals Stratified Charge Rotary Engine for General Aviation

1986 ◽  
Author(s):  
Robert E. Mount ◽  
Anthony M. Parente ◽  
William F. Hady
Keyword(s):  
Power Plants ◽  
Cost Savings ◽  
Aircraft Engine ◽  
General Aviation ◽  
Stratified Charge ◽  
Rotary Engine ◽  
The Past ◽  
Rotary Engines ◽  
Rotary Wing ◽  
Engine Development

Exciting developments have occurred over the past two years in the technological status and production aspects of Stratified Charge Rotary Engines. A program is currently underway for the development, certification and production of a 400 HP aircraft engine in early 1990. The joint program is being conducted by John Deere’s Rotary Engine Division and AVCO Lycoming Williamsport Division. The engine will offer to the General Aviation community Jet-A fuel capability at substantial cost savings, improved altitude capability and lower fuel consumption over turbine power plants. Application to fixed wing and rotary wing aircraft are planned. Other stratified charge rotary engine development work in progress involves ground power units, airborne APU’s, shipboard gensets and vehicular engines, supported by Deere production capabilities and DOD interests. Technology enablement efforts by NASA, aimed at highly advanced output and efficiency are in progress leading toward revolutionary engine capability for aircraft and other applications.

scholarly journals High Pressure Ratio Intercooled Turboprop Study

1992 ◽  
Author(s):  
C. Rodgers
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Waste Heat ◽  
Pressure Ratio ◽  
Weight Ratio ◽  
Unmanned Aircraft ◽  
High Pressure Ratio ◽  
Rotary Engines ◽  
Component Efficiency ◽  
Long Endurance

High altitude long endurance unmanned aircraft impose unique contraints on candidate engine propulsion systems and types. Piston, rotary and gas turbine engines have been proposed for such special applications. Of prime importance is the requirement for maximum thermal efficiency (minimum specific fuel consumption) with minimum waste heat rejection. Engine weight, although secondary to fuel economy, must be evaluated when comparing various engine candidates. Weight can be minimized by either high degrees of turbocharging with the piston and rotary engines, or by the high power density capabilities of the gas turbine. The design characteristics and features of a conceptual high pressure ratio intercooled turboprop are discussed. The intended application would be for long endurance aircraft flying at an altitude of 60,000 ft. (18,300 m). It is estimated that such a turboprop would be capable of thermal efficiencies exceeding 40% with current state-of-the-art component efficiency levels and an overall compressor pressure ratio of 66.0. Projected Power (at altitude) to weight ratio is comparable to that of competitive piston and rotary engines.

High-Efficiency Internal Combustion Engine Used in the Unmanned Aircraft

2015 ◽  
Vol 220-221 ◽  
pp. 928-933 ◽  
Author(s):  
Kristjan Tiimus ◽  
Mikk Murumäe ◽  
Eero Väljaots ◽  
Mart Tamre
Keyword(s):  
High Efficiency ◽  
Combustion Engine ◽  
Unmanned Aircraft ◽  
Atmospheric Conditions ◽  
Flight Duration ◽  
Test Platform ◽  
Military Applications ◽  
Long Endurance ◽  
Variable Weather ◽  
Varying Demand

Unmanned aerial vehicles (UAVs) are used predominately for military applications, despite a growing number of emerging civilian tasks. One of the key tasks for increasing the advantages over a manned aircraft are to extend the flight duration of the UAV. Long endurance flights demand an engine that adapts to variable weather and atmospheric conditions as well as to changes in altitude. Varying demand of the UAV for power is compared to determine the needs for our mid-class test platform. The paper presents a solution to a high-efficiency engine and suggests a test layout for assessing reliability and optimal performance.

The Stratified Charge Rotary Engine

1987 ◽  
pp. 203-218 ◽  
Author(s):  
James W. Walker ◽  
Robert E. Mount
Keyword(s):  
Stratified Charge ◽  
Rotary Engine

scholarly journals On the Use of Rotary-Wing Aircraft to Sample Near-Surface Thermodynamic Fields: Results from Recent Field Campaigns

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 10 ◽  
Author(s):  
Temple Lee ◽  
Michael Buban ◽  
Edward Dumas ◽  
C. Baker
Keyword(s):  
Weather Prediction ◽  
Chemical Properties ◽  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Spatiotemporal Variability ◽  
Near Surface ◽  
Field Campaigns ◽  
High Level ◽  
Rotary Wing

Rotary-wing small unmanned aircraft systems (sUAS) are increasingly being used for sampling thermodynamic and chemical properties of the Earth’s atmospheric boundary layer (ABL) because of their ability to measure at high spatial and temporal resolutions. Therefore, they have the potential to be used for long-term quasi-continuous monitoring of the ABL, which is critical for improving ABL parameterizations and improving numerical weather prediction (NWP) models through data assimilation. Before rotary-wing aircraft can be used for these purposes, however, their performance and the sensors used therein must be adequately characterized. In the present study, we describe recent calibration and validation procedures for thermodynamic sensors used on two rotary-wing aircraft: A DJI S-1000 and MD4-1000. These evaluations indicated a high level of confidence in the on-board measurements. We then used these measurements to characterize the spatiotemporal variability of near-surface (up to 300-m AGL) temperature and moisture fields as a component of two recent field campaigns: The Verification of the Origins of Rotation in Tornadoes Experiment in the Southeast U.S. (VORTEX-SE) in Alabama, and the Land Atmosphere Feedback Experiment (LAFE) in northern Oklahoma.

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