Does L d change with weight?
Variations in aircraft weight do not affect the glide angle provided that the correct airspeed is flown. Since it is the lift over drag (L/D) ratio that determines the gliding range, weight will not affect it. The only effect weight has is to vary the time the aircraft will glide for.
When the undercarriage is lowered in flight?
Cards
| Term Airplanes were developed primarily by: | Definition the trial and error method |
|---|---|
| Term What effect on lift induced drag does entering ground effect have? | Definition (a) It decreases. |
| Term When the undercarriage is lowered in flight: (a) | Definition Form drag will increase and the aircraft will pitch nose down. |
When does an airplane have a high L / D ratio?
Aerodynamicists call the lift to drag ratio the L/D ratio, pronounced “L over D ratio.”. An airplane has a high L/D ratio if it produces a large amount of lift or a small amount of drag. Under cruise conditions lift is equal to weight. A high lift aircraft can carry a large payload. Under cruise conditions thrust is equal to drag.
How does the L / D ratio affect the glide angle?
From the last equation we see that the higher the L/D, the lower the glide angle, and the greater the distance that a glider can travel across the ground for a given change in height. Because lift and drag are both aerodynamic forces , we can think of the L/D ratio as an aerodynamic efficiency factor for the aircraft.
Why is the lift to drag ratio called the L / D ratio?
Because lift and drag are both aerodynamic forces, the ratio of lift to drag is an indication of the aerodynamic efficiency of the airplane. Aerodynamicists call the lift to drag ratio the L/D ratio, pronounced “L over D ratio.”
Which is worse the L / D ratio or the cruise ratio?
The L/D ratio is usually lesser i.e. worse in landing configuration comapred to cruise. Basically, the high lift devices in the wing trade off some effeciency (L/D) for extra lift.