How is the lift and drag ratio determined?
The lift/drag ratio is used to express the relation between lift and drag and is determined by dividing the lift coefficient by the drag coefficient, CL/CD. A ratio of L/D indicates airfoil efficiency. Aircraft with higher L/D ratios are more efficient than those with lower L/D ratios.
How is the drag coefficient of a wing calculated?
The induced drag coefficient Cdi is equal to the square of the lift coefficient Cl divided by the quantity: pi (3.14159) times the aspect ratio AR times an efficiency factor e . The aspect ratio is the square of the span s divided by the wing area A . For a rectangular wing this reduces to the ratio of the span to the chord.
How is the drag coefficient calculated at supersonic speeds?
At supersonic speeds, shock waves will be present in the flow field and we must be sure to account for the wave drag in the drag coefficient. So it is completely incorrect to measure a drag coefficient at some low speed (say 200 mph) and apply that drag coefficient at twice the speed of sound (approximately 1,400 mph, Mach = 2.0).
How does AOA affect lift and drag ratio?
Any AOA lower or higher than that producing the maximum Lift/Drag ratio reduces the Lift/Drag ratio and consequently increases the total drag for a given aircraft’s lift. Lift/drag ratio also determines the glide ratio and gliding range.
How to calculate the thrust of a multirotor motor?
If you know the size of the frame, you can determine the right propeller size. Using the weight and propeller size, you can compute generally how much thrust the motors need to have to lift off and fly the quadcopter at speed. A general rule is that the motors should be able to provide twice as much thrust as the total weight of the quad.
What can you do with a high strength to weight ratio?
A high SWR usually means you can produce more power with every action — so you can run, swim and cycle faster. In gymnastics, an athlete with a higher strength-to-weight ratio can perform better in suspension exercises, such as on the rings or parallel bars.