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L/D
- Usado para
- lift-to-drag ratio
- Definição1
- L/D Ratio of total lift to total drag, fundamental measure of effiiency of aircraft; L is normally constant and equal to weight but drag varies approx as square of airspeed; thus L/D plot is curve with peak at one particular airspeed for each aircraft, L/Dmax.
- Fonte1
- GUNSTON, Bill. The Cambridge aerospace dictionary. Cambridge: Cambridge University, 2004. (Cambridge aerospace series.)
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Report by the second CAEP noise technology independent expert panel: novel aircraft-noise technology review and medium- and long-term noise reduction goals: report. Montreal, 2014. (Doc. 10017).
- Fonte3
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Report of the independent experts on the medium and long term goals for aviation fuel burn reduction from technology. Montreal, 2010. (Doc. 9963).
- Contexto
- The EPNL at the flyover measuring point depends on the effective jet speed at cutback for an airspeed of V2+20 kts and the flyover altitude. The latter depends on the take-off field length, the initial climb ratio and the climb ratio at the flyover point. The climb ratios depend on the thrust-to-weight ratio and the lift-to-drag ratio. The field length depends on thrust-to-weight ratio and V2 speed of the aircraft.
- It was found that the different calculations of fuel burn for the baseline aircraft agreed reasonably well in terms of absolute kg/ATK but it was also found that if the precise inputs were matched (e.g. lift/drag ratio, empty weight/maximum take-off weight, engine specific fuel consumption, reserve fuel assumptions) then the agreement in absolute values was very close even when different models were used.
- As already noted, in Figure 2.1 all parameters related to the technology level of the aircraft (lift/drag ratio, engine specific fuel consumption, empty weight/maximum take-off weight) are held constant for this comparison.
- Related Term
- L/D MAX
- Português
- curva de sustentação vs. arrasto