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What is the relationship between drag force and velocity?
Drag force is proportional to the velocity for low-speed flow and the squared velocity for high speed flow, where the distinction between low and high speed is measured by the Reynolds number. Even though the ultimate cause of a drag is viscous friction, the turbulent drag is independent of viscosity.
How does thrust affect a helicopter?
If thrust exceeds drag, the helicopter increases speed; if thrust is less than drag, it decreases speed. In sideward flight, the tip-path plane is tilted sideward in the direction that flight is desired, thus tilting the total lift-thrust vector sideward.
What are the forces acting on an Aeroplane?
Forces Acting on the Aircraft The four forces acting on an aircraft in straight-and-level, unaccelerated flight are thrust, drag, lift, and weight. They are defined as follows: Thrust—the forward force produced by the powerplant/ propeller or rotor.
What forces does a helicopter use?
There are four forces acting on a helicopter in flight. They are lift, weight, thrust, and drag. See figure 2-1.
As the airspeed increases, both more air per unit time is pushed downward, and it is pushed downward faster. Put another way, the force is (mass / time) (velocity), with both mass/time and velocity roughly proportional to the airspeed, so the force is proportional to the square of the airspeed.
What is the lift of doubling the airspeed?
We know that increasing the airspeed increases the lift. This gives a lift equal to 158.6 pounds. As before, let’s double the Airspeed to 200 mph. WHAT IS THE NEW VALUE OF LIFT?
How are lift and momentum related to airspeed?
As it moves along, it deflects air downwards. Lift is the upwards force from imparting downward momentum on the air the wing passes thru. Momentum is mass times velocity, and force is momentum per time. As the airspeed increases, both more air per unit time is pushed downward, and it is pushed downward faster.
How is lift related to the air speed?
Lift is the upwards force from imparting downward momentum on the air the wing passes thru. Momentum is mass times velocity, and force is momentum per time. As the airspeed increases, both more air per unit time is pushed downward, and it is pushed downward faster. Put another way, the force is (mass / time) (velocity),…