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WorksheetsWeight and Thrust
Total questions: 15
Worksheet time: 11mins
How is thrust produced in a drone?
As the propellers rotate, air pushes up through the drone’s center of gravity
The battery sends a signal to make the drone move up.
Gravity pulls the drone down and the drone pushes back up.
As the propellers rotate, they push air down and the air pushes back on the propellers.
The amount of thrust generated by a propeller depends upon _____.
Its size, shape and speed of rotation
Its shape and pitch
Its thrust constant and length
Its speed and composition
As rotational speed increases, thrust (a)
What do you know about a 7050 propeller?
It has a pitch of 7 inches and is 5 inches long.
It is 7 inches long and has a 5 inch pitch.
It is capable of rotating at 7050 RPS.
It will produce a thrust of 70.5 N at maximum speed.
Drag force is directly proportional to ____.
thrust
shorter and faster blades
velocity
longer and slower blades
The mathematical equation for torque is kt x (a)
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 does the maximum operating point of a given propeller and motor combination reveal?
How a motor will perform with a particular propeller.
Where the motor and propeller torque curves intersect
The x coordinate is the maximum operating speed.and the y coordinate is the maximum operating torque.
All of the answers are correct
How can thrust be increased?
Decrease payload occlusion
Choose a motor with a higher KV rating
All answers are correct
Choose a battery with a higher voltage
Why is the thrust-to-weight ratio (T/W) important to consider when designing your drone?
The opposing forces of thrust and weight must always be balanced.
Total thrust must exceed total weight in order to maneuver the drone.
Thrust always pulls the drone upward and weight is a force that pulls the drone downward.
It’s not; the thrust-to-drag ratio is more important.
Which must be true about the thrust-to-weight ratio for a functional drone?
T/W < 1
T/W > 1
T/W = 1
A minimum thrust-to-weight ratio just slightly greater than one _____.
is not enough to create the torques required for stable flight
is all that is needed to maneuver the drone
will only move the drone forward
can tilt the drone 45 degrees
In order to move the drone in the horizontal direction, you must _____.
make the tilt angle 90 degrees
change the thrust so it only pulls in the horizontal direction
switch the CCW and CW propellers
make the tilt angle greater than 0
As the direction of thrust becomes more horizontal, the drone will ______.
flip over
decrease speed in the horizontal direction
increase speed in the horizontal direction
always split the total thrust equally between horizontal and vertical
Your challenge is to build a drone that can deliver a package in the fastest time possible; therefore, your drone should have maintain a steady flight with a tilt angle of (a) degrees.
