Last time we talked about how rear rotor take a big part in control of helicopters. So we remain just one question... How to control the wind speed or output power of the rear rotor? How to make the rear rotor synchronized with the main rotor? How do they coordinate with each other?
Usually the rear rotor is powered by the main engine. So by adjusting the size of the gear that driving the rear rotor, we can actually synchronize the rear and the main rotor to make the helicopter remain stable within a clean condition that no other factors take in. It's just like the gearbox system on your car or your bike. But to make the maneuver practical, we need to adjust the output power of the rear rotor constantly, which is not an easy task that can be solved by simply using gears.
Since the rear rotor is driven by the main engine, the rotation speed here is fixed, no way to change the velocity of the rotation. Wait! There's one way. You can open the throttle, increasing the engine's output so that the rear output is increased. Then this problem is solved. When you get a strong wing coming from left, you increase the engine power; when you get a strong wing from right you lower the rotor speed. But hey, how about the main rotor? This solution will cause the helicopter to go up and down due to the change of output power from main rotor. So the solution thus can not be a perfect solution. It will lead to other problems. Therefore, scientists come up with an idea, "change the slope of the rear rotor's blade." Changing the slope of the blades can control the amount of wind being propelled. Thus scientists can gain fully control of the helicopter.
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