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==References==

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 <!-- a. Propeller and motors -->
 ''<u>Propellers:</u>'' The purpose of the four quadcopter propellers, one attached to each motor, is to generate thrust and torque to keep the drone flying, and to maneuver it (up, down, left, right, rotate clockwise, rotate counterclockwise, forward, and backward). The upward thrust force generated by the propellers is usually measured in pounds or grams. To keep the drone flying at a hover, the upward thrust generated by the propellers must equal the weight of the drone. Typically, quadcopter propellers produce more thrust the faster they spin. The quadcopter drone has two different types of propellers and motors. One set is designed to spin clockwise (4 and 1 in the diagram below), while the other is designed to spin counter clockwise (2 and 3 in the diagram).
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 :In combination with the propellers, a quadcopter/drone’s motors enhances the drone control in terms of direction (up, down, left, right, rotate clockwise, rotate counterclockwise, forward, and backward).
 :There are two fundamental types of motors used in drones: '''brushed''' and '''brushless''' motors, which vary in the way they work. Brushless motors are typically more efficient than brushed motors. Brushless motors last longer because there are no brushes to wear out, while the brushed motor wears out quickly. Almost 100% of quadcopters available on the market today use brushless motors.
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 <!-- e. Battery -->
 Batteries are the life source for a drone. Drone batteries come in many different energy storage chemistries or types such as lithium ion, lithium polymer (LiPo) and nickel metal hydride. LiPo batteries are one of the most popular batteries used to power drones because they are lightweight, inexpensive, readily available in a variety of sizes, capacities, voltages and have high current rates.
 ''<u>Capacity</u>'': A battery’s capacity, usually measured in milli-amp hours (mAh), determines how long the battery can fuel the drone’s motors. This is how much drain can be put on the battery to discharge it in one hour. The higher the mAh, the longer the flight. But there is a trade-off – a higher capacity means a heavier battery. The drain of a drone’s motor system is usually rated in amps (A). Therefore the example battery, a 5000mAh battery will provide 5A in one hour.
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 <!-- f. Remote control (RC) receiver and transmitter -->
 The receiver is the unit responsible for the reception of the radio signals sent to the drone through the controller. The minimum number of channels that are needed to control a drone are usually four.
 The transmitter/remote controller is the unit responsible for the transmission of the radio signals from the controller to the drone to issue commands of flight and directions. Just like the receiver, the transmitter needs to have 4 channels for a drone but 5 is usually recommended. Different types of receivers are available in the market for drone manufacturers to choose from. The receiver and the transmitter must use a single radio signal in order to communicate to the drone during flight. Each radio signal has a standard code that helps in differentiating the signal from other radio signals in the air.
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 <!-- 10. After being certified, perform the following basic maneuvers with a drone: -->
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 <!-- d. 360-degree rotation (GPS) -->
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