Definitions for lift-to-drag ratio
lift-to-drag ra·tio

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1. lift-to-drag rationoun

   The instantaneous ratio of lift to drag of an aerodynamic article such as an a wing, entire aircraft or bird.

2. lift-to-drag rationoun

   The maximum ratio of lift to drag of an aerodynamic article such as an a wing, entire aircraft or bird can achieve.

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1. Lift-to-drag ratio

   In aerodynamics, the lift-to-drag ratio (or L/D ratio) is the lift generated by an aerodynamic body such as an aerofoil or aircraft, divided by the aerodynamic drag caused by moving through air. It describes the aerodynamic efficiency under given flight conditions. The L/D ratio for any given body will vary according to these flight conditions. For an aerofoil wing or powered aircraft, the L/D is specified when in straight and level flight. For a glider it determines the glide ratio, of distance travelled against loss of height. The term is calculated for any particular airspeed by measuring the lift generated, then dividing by the drag at that speed. These vary with speed, so the results are typically plotted on a 2-dimensional graph. In almost all cases the graph forms a U-shape, due to the two main components of drag. The L/D may be calculated using computational fluid dynamics or computer simulation. It is measured empirically by testing in a wind tunnel or in free flight test.The L/D ratio is affected by both the form drag of the body and by the induced drag associated with creating a lifting force. It depends principally on the lift and drag coefficients, angle of attack to the airflow and the wing aspect ratio. The L/D ratio is inversely proportional to the energy required for a given flightpath, so that doubling the L/D ratio will require only half of the energy for the same distance travelled. This results directly in better fuel economy.

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1. Lift-to-drag ratio

   In aerodynamics, the lift-to-drag ratio, or L/D ratio, is the amount of lift generated by a wing or vehicle, divided by the drag it creates by moving through the air. A higher or more favorable L/D ratio is typically one of the major goals in aircraft design; since a particular aircraft's required lift is set by its weight, delivering that lift with lower drag leads directly to better fuel economy, climb performance, and glide ratio. The term is calculated for any particular airspeed by measuring the lift generated, then dividing by the drag at that speed. These vary with speed, so the results are typically plotted on a 2D graph. In almost all cases the graph forms a U-shape, due to the two main components of drag. Lift-to-drag ratios can be determined by flight test, by calculation or by testing in a wind tunnel.

How to pronounce lift-to-drag ratio?

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Numerology

1. Chaldean Numerology

   The numerical value of lift-to-drag ratio in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of lift-to-drag ratio in Pythagorean Numerology is: 4

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Lift-to-Drag_Ratio
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Lift-to-Drag_Ratio
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=lift-to-drag ratio