How do two engines power a single rotor?

In a typical helicopter, a single engine powers the main rotor. There are a few exceptions to this, such as the CH-47 Chinook, which has two engines that power a single rotor. In these cases, the engines are connected to the rotor through a gearbox. The gearbox allows the engines to turn at a different speed than the rotor, and it also provides a way to change the direction of the rotor's rotation.

Here is a more detailed explanation of how two engines power a single rotor:

1. The engines are connected to the gearbox through a set of gears.

2. The gears turn the rotor at a specific speed.

3. The gearbox also allows the engines to turn at a different speed than the rotor.

4. This is necessary because the engines need to turn faster than the rotor in order to generate enough power.

5. The gearbox also provides a way to change the direction of the rotor's rotation.

6. This is necessary because the helicopter can fly in either direction.

By using a gearbox, it is possible to connect two engines to a single rotor and generate enough power to fly a helicopter.