4.RangeEndurance

4.RangeEndurance - MEM 425 Aircraft Design Performance...

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MEM 425: Aircraft Design & Performance ** Range & Endurance Dr. Ajmal Yousuff Dept. MEM Drexel University
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Range & Endurance Range : total distance traversed on a given amount of fuel (in cruise) Endurance : total time in air on a given amount of fuel (in cruise) Yousuff MEM 425 aircraft 2 Depends on specific fuel consumption (sfc)
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Specific fuel consumption For piston engines: sfc is in terms of power For jet engines: sfc is in terms of thrust Yousuff MEM 425 aircraft 3 The units for sfc will differ. We will handle these separately.
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sfc for prop sfc : weight of fuel consumed per unit time per unit power . Yousuff MEM 425 aircraft 4 of fuel ; . ( )( .) ( )( ) lb wt sfc ie hp hr power time   
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max min of fuel wt. min: distance distance ( )( )( ) ( )( ) min: ( )( ) distance lb sfc power time sfc power sfc thrust velocity RT  Qualitative analysis for prop For max endurance (E) : Yousuff MEM 425 aircraft 5 For max range (R) :
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Endurance (prop) Set c=sfc & dW f =change in weight of fuel Yousuff MEM 425 aircraft 6 Let W 0 = a/c wt. w/ full tanks, and W 1 = a/c wt. with empty tanks.
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This note was uploaded on 04/26/2011 for the course MEM 425 taught by Professor Yousuff during the Spring '08 term at Drexel.

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4.RangeEndurance - MEM 425 Aircraft Design Performance...

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