If each of the three rotor helicopter blades is 3.75 mm long and has a mass of 135 kgkg, calculate the moment of inertia of the three rotor blades about the axis of rotation.

Explanation:

The computation of the moment of inertia of the three rotor blades is shown below:

Given that

Three rotor helicopter blades = 3.75 mm long

Mass = 135 kg

Based on the above information

As we know that

Axis at the end is

Now the total moment of inertia is

Hence, the moment of inertia of the three rotor blades is

We simply applied the above formula and the same is to be considered

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft