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The fuel parameters most relevant relevant to gas turbine enengine and vehicle vehicle performanceare performanceare the heat of combustio combustion n on a mass basis in air and the density. For gas turbine (Brayton cycle) engines, the most importantengineparameter importantengineparametersare sare thrust/ thrust/weigh weightt ratioand speciоЂЂc speciоЂЂc fuel consumption. As described later, the maximum compression ratio is typically limited by the tendency of aviation gasoline to autoignite prematurely, prematurely, as characterized by octane number. For reciprocating, for example, Otto cycle, engines, the key engine parameters are horsepower/weight ratio (primarily driven by compression ratio) and speciоЂЂc fuel consumption (fuel mass оЂЃow divided by engine thrust or horsepower). To understand the evolution of fuels and propellants, it is helpful to introduce the fuel properties that drive engine performance. The intent of this paper is to describe the evolution of liquid fuels for aircraft and rockets as the engines and vehicles they fuel have undergone these signiоЂЂcant signiоЂЂcant increases increases in performance. Agai Again,the n,the contrast with current vehicles such as the space shuttle, which can lift over 50,000 lb to to 200C miles into low Earth orbit,4 is dramatic. Robert GoddardвЂ™s оЂЂrst оЂЂrst оЂЃight оЂЃight of a liquidrock liquidrocketon eton 16 March March 1926 1926 reachedan reachedan altitud altitudeof eof 41 ft and and land landed184ft ed184ft fromthe fromthe laun launchpoi chpoint(seeRef nt(seeRef. The Wright brothers probably consumed less than a gallon of gasoline in that that оЂЂrst оЂЂrst day of оЂЃight оЂЃight tests.In tests.In 1997,airlin 1997,airlines es consum consumedan edan avera average ge 2В¤ of 177 million gal/day of jet fuel worldwide.

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Contrast Contrast that with with currentaircraft such as the Boeing Boeing 777, which can оЂЃy 8000 n miles, equipped with engines from the the GE90 and PW4000 series that generate over 100,000 lb of thrust. Air Force Force Research Laboratory, WrightвЂ“Patterson Air Force Force Base, Ohio 45433-7103 4543 3-7103ДЄJOR AJOR increases increases in liquid-fuele liquid-fueled d propulsion performance performance haveoccurr haveoccurredin edin thepast 100years.The Wrightbrothe WrightbrothersоЂЂrst rsоЂЂrst оЂЃew on 14 December 1903 with an engine that generated slightly more than than 130 lb of thrust thrust for оЂЃights оЂЃights that ranged ranged from 120 to 850 ft (Ref. Liquid Fuels and Propellants for Aerospace Propulsion: 1903вЂ“2003 Tim Edwards U.S.

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