DRONE THRUST

The upward force creating by the rotating propellers is known as _____.

• drag

• weight

• motion

• thrust

The mathematical definition of thrust shows that thrust depends on _____.

• the propeller’s width and weight

• the propeller’s thrust constant and the square of its rotational speed

• half the propeller’s speed and its thrust constant

• the speed of the drone and its overall thrust constant

A propeller generates 0.6 N of thrust at 1000 RPS. In order to increase the thrust to 2.4 N, the rotational speed must increase to approximately _____.

• 1500 RPS

• 2000 RPS

• 4000 RPS

• 10,000 RPS

Which of the following propellers is the longest?

• 1147

• 5030

• 7050

• 8038

Drag force is directly proportional to ____.

• velocity

• thrust

• shorter and faster blades

• longer and slower blades

What is the mathematical equation for torque?

• Torque = force/mass

• Torque = k_t × ω²

• Torque = mass × gravity

• Torque = k_T × ω²

What limits the maximum amount of torque a motor can produce?

• The no load speed

• The stall torque

• The amount of current used to turn the motor

• The type of controller used to operate the motors

What would be true about the max operating point if the propeller torque curve intersected the maximum motor torque curve before it intersected the motor torque-speed curve?

• The max operating point would lie on the maximum motor torque curve (dashed red line).

• The max operating point would lie above the maximum motor torque curve (dashed red line).

• The max operating point would lie below the maximum motor torque curve (dashed red line).

• That can’t happen.

How thrust be increased?

• Choose a motor with a higher KV rating

• Choose a battery with a higher voltage

• Decrease payload occlusion

• All of the above