Throttle Engine Power:
The throttle engine power controls the speed at which the helicopter's main rotor spins. Increasing throttle power increases rotor speed, which generates more lift and allows the helicopter to climb. Reducing throttle power decreases rotor speed, causing the helicopter to descend.
Collective:
Collective is a cyclic control that changes the pitch angle of all the helicopter's rotor blades simultaneously. Increasing collective increases the rotor blades' pitch angle, generating more lift. This allows the helicopter to ascend even at a constant engine power. Decreasing collective decreases the rotor blades' pitch, reducing lift and causing the helicopter to descend.
Here is a summary of their differences:
1. Function: Throttle engine power controls the rotor's speed and thus the amount of lift generated. Collective changes the rotor blades' pitch angle, altering lift production.
2. Power Source: Throttle engine power regulates fuel flow to the helicopter's engine, affecting the engine's output. Collective directly controls the amount of lift produced by the rotor blades.
3. Usage: Throttle engine power is typically used to adjust the climb rate or rate of descent during flight. Collective is primarily employed for hovering, take-offs, and landings, as it provides better control over the helicopter's vertical position.
In brief, while throttle engine power and the collective influence vertical flight, they are distinctly different control and operate independently to achieve various manoeuvres during helicopter flight.
