- #1

Timothy Teo

- 5

- 1

## Homework Statement

The rotor blades of a quadcopter are 10cm long. Given that the thrust force generated by each rotor is 1N (giving a total of 4N for 4 rotors), calculate the torque () on each rotor, and the current drawn (I) from a 10V battery, given the following:

- Density of air, a = 1 kg/m3.
- Shaft efficiency, Nsh = Psh/Pe , where Psh & Pe are the shaft power and electrical power, respectively, is 0.95.
- Rotor efficiency, N =P/ Pe , where P is the power generated by the rotor, is 0.8.
- The rotor blades are rotating at a speed of 6000 RPM.

Ans: 8mN.m , I= 2A

## Homework Equations

P = I V

KE = 1/2 mv^2

F = mv

## The Attempt at a Solution

F = mv. Found velocity of the air exiting the propeller. Tired to use KE equation to find power but it doesn't match the answe.