specific efficiency

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• Specific impulse — (usually abbreviated I sp) is a way to describe the efficiency of rocket and jet engines. It represents the impulse (change in momentum) per unit of propellant. The higher the specific impulse, the less propellant is needed to gain a given amount …   Wikipedia

• Specific fuel consumption (thrust) — Specific fuel consumption, often shortened to SFC, or TSFC is an engineering term that is used to describe the fuel efficiency of an engine design with respect to thrust output. It allows the efficiency of different sized engines to be directly… …   Wikipedia

• Efficiency — as a technical term may refer to: * Algorithmic efficiency, optimizing the speed and memory requirements of a computer program * Efficient energy use, useful work per quantity of energy ** Energy conversion efficiency, desired energy output per… …   Wikipedia

• Specific detectivity — Specific detectivity, or D*, for a photodetector is a figure of merit used to characterize performance, equal to the reciprocal of noise equivalent power (NEP), normalized per unit area. Specific detectivity is given by , where A is the area of… …   Wikipedia

• Specific Speed — The net suction specific speed is a dimensionless number defined by centrifugal and axial pumps inherent physical characteristics and operating pointcite web| url = http://www.gouldspumps.com/cpf 0008.html| title = NPSH and Suction Specific Speed …   Wikipedia

• Specific speed — Pump Specific Speed is an index that, in mechanical terms, represents the impeller speed of a pump necessary to generate 1 gallon per minute at 1 foot of head.Ns = (n*sqrt(Q)) / (gH^(3/4))Ns = specific speed (unitless)n = pump rotational speed in …   Wikipedia

• specific impulse — noun : the thrust produced per unit rate of consumption of the propellant usually specified in pounds of thrust per pound of propellant used per second and forming a measure of the efficiency of performance of a rocket engine * * * Rocketry. 1. a …   Useful english dictionary

• Specific power — In engineering, the term specific power can refer to power either per unit of mass, volume or area, although power per unit of volume is more formally known as power density, and power per unit area as surface power density. [… …   Wikipedia

• Efficiency —   Under the First Law of Thermodynamics, efficiency is the ratio of work or energy output to work or energy input, and cannot exceed 100 percent. Efficiency under the Second Law of Thermodynamics is determined by the ratio of the theoretical… …   Energy terms

• Specific duty — Duty Du ty, n.; pl. {Duties}. [From {Due}.] 1. That which is due; payment. [Obs. as signifying a material thing.] [1913 Webster] When thou receivest money for thy labor or ware, thou receivest thy duty. Tyndale. [1913 Webster] 2. That which a… …   The Collaborative International Dictionary of English

• specific impulse — Rocketry. 1. a measure, usually in seconds, of the efficiency with which a rocket engine utilizes its propellants, equal to the number of pounds of thrust produced per pound of propellant burned per second. 2. the specific impulse that a given… …   Universalium