Quiz on RC Planes and Hovercraft

What type of battery is commonly used for an RC plane?

• Li-ion

• LiFe

• LiPo

• LiHg

Answer explanation

LiPo (Lithium Polymer) batteries are commonly used in RC planes due to their high energy density, lightweight, and ability to deliver high discharge rates, making them ideal for the performance needs of remote-controlled aircraft.

What is the primary function of an aileron in an RC plane?

• Control yaw

• Control pitch

• Control roll

• Increase thrust

Answer explanation

The primary function of an aileron in an RC plane is to control roll. Ailerons are located on the wings and move in opposite directions to tilt the aircraft, allowing it to roll left or right during flight.

How many axes of rotation exist in an airplane?

• 1

• 2

• 3

• 4

Answer explanation

An airplane has three axes of rotation: the roll axis (longitudinal), the pitch axis (lateral), and the yaw axis (vertical). These axes allow the aircraft to maneuver in three-dimensional space, making the correct answer 3.

What mAh in battery denotes for (e.g. 1500mAh

• micro Ampere Hour

• Mili Ampere Hour

• Mega Ampere Hour

• None

Answer explanation

The antenna is the component that connects the transmitter to the receiver in an RC plane, allowing for communication between the two. The other options, like servo and ESC, serve different functions.

What is the function of the rudder in an RC plane?

• Control pitch

• Control roll

• Control yaw

• Increase lift

Answer explanation

The rudder in an RC plane is used to control yaw, which is the left and right movement of the aircraft's nose. It helps in steering the plane during flight, making it essential for directional control.

What principle allows a hovercraft to float above the ground?

• Bernoulli’s Principle

• Archimedes’ Principle

• Ground Effect

• Magnetic Levitation

Answer explanation

A hovercraft floats above the ground due to Ground Effect, which occurs when air is trapped between the craft and the surface, creating lift. This principle is essential for the hovercraft's ability to glide smoothly.

What component of a force counters the gravity element in a RC Plane?

• Drag

• Thrust

• Lift

• None

Answer explanation

The blower fan is responsible for generating the cushion of air in a hovercraft. It pushes air underneath the craft, creating a high-pressure area that allows the hovercraft to float above the surface.

What is the legal frequency for receiver and transmitter use in India?

• 1.4 GHz

• 2.4 GHz

• 2.5 GHz

• 2.4 Hz

Answer explanation

In India, the 2.4 GHz frequency is commonly used for various wireless communications, including Wi-Fi and Bluetooth. This frequency is legally designated for receiver and transmitter use, making it the correct choice.

Which airfoil shape is primarily designed to enhance lift during flight?

• Symmetrical

• Cambered

• Flat-bottomed

• Delta

Answer explanation

The flat bottom airfoil is designed to create a significant pressure difference between the upper and lower surfaces, maximizing lift. This design is particularly effective at lower speeds, making it ideal for achieving maximum lift.

What is the purpose of an ESC in an RC plane?

• Control servos

• Stabilize voltage

• Control motor speed

• Increase battery life

Answer explanation

The ESC (Electronic Speed Controller) in an RC plane primarily controls motor speed, allowing for precise adjustments in thrust and maneuverability during flight.