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MEM425F09_12.Design.Thrust

MEM425F09_12.Design.Thrust -...

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Click to edit Master subtitle style MEM 425: Aircraft Design & Performance Thrust-to-weight & wing-loading
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T/W  and  W/S  determination Need to estimate fairly accurately for initial layout T/W   Y   power plant, engine W/S      wing size T/W   &  W/S   are inter-related Ex: take-off / & / T W performance W S & - & W T low low S W OR short take off W T hi hi S W
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Thrust-to-Weight Ratio High  T/W  yields: Quick acceleration Rapid climb Higher  Vmax Higher turn-rates Higher fuel-consumption T/W  is not a constant Normally, take-off  T/W   is used For prop a/c, use Power Loading  (W/hp): (~  10- 15) 550 p prop T hp W V W η = 
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Statistical estimate of  T/W T/W   (@ sea level, 0-velocity) hp/W   (@ sea level) Trainer 0.4 Fighter  (dog) 0.9 Fighter  (other) 0.6 Military 0.25 Transport 0.25 Table  5.1
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