A helicopter with an unloaded mass of 10000 kg takes off from sea level with a load. The wings rotate at 400 rpm without load. The horizontal wings on the helicopter allow an air mass of 15 m diameter to move downward at an average speed in proportion to the rotation speed. The helicopter was loaded with 15000 kg payload and the helicopter took off slowly. a) The volumetric flow rate of the downward air flow created by the helicopter while taking off without load and the required power b) When the helicopter takes off with a load of 15000 kg, find the speed and power of the wings to rotate. The density of the air in atmospheric conditions can be taken as 1.18 kg / m3. It is accepted that the air approaches the wings from above in a large area and with negligible speed, and is moved downward by the wings at a uniform speed from the imaginary cylinder, which has a base area equal to the wing span.
A helicopter with an unloaded mass of 10000 kg takes off from sea level with a load. The wings rotate at 400 rpm without load. The horizontal wings on the helicopter allow an air mass of 15 m diameter to move downward at an average speed in proportion to the rotation speed. The helicopter was loaded with 15000 kg payload and the helicopter took off slowly.
a) The volumetric flow rate of the downward air flow created by the helicopter while taking off without load and the required power
b) When the helicopter takes off with a load of 15000 kg, find the speed and power of the wings to rotate. The density of the air in atmospheric conditions can be taken as 1.18 kg / m3. It is accepted that the air approaches the wings from above in a large area and with negligible speed, and is moved downward by the wings at a uniform speed from the imaginary cylinder, which has a base area equal to the wing span.
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