Helikopter med gyro. Hvad er en "gyro"?
WHAT DOES THE GYRO DO?
The gyro is an essential component in many RC helicopters. Gyros in RC
helicopters are most commonly used to control unwanted movement on the yaw axis.
When an RC helicopter rotates on its yaw axis, the direction the nose points
(the heading) changes. The yaw gyro’s job is to sense any undesired rotation
around the yaw axis (clockwise or counter clockwise rotation when viewed from
above), and to automatically correct the orientation of the RC helicopter.
Without a yaw gyro, even if the RC helicopter was trimmed out to fly straight
initially, it would eventually begin to drift and rotate right or left. Normal
maneuvering of the RC helicopter and external foRCes can result in undesired yaw
rotation. When this occurs, the gyroscope senses this change in yaw and corrects
it. This results in stable flight for the RC helicopter and no undesired changes
in yaw.
The piezo type gyros work with no moving parts. It uses a triangular crystal with a piezo element on each side. The piezo element is used in a lot of watches to make the beep sound from the alarm function. The material not only can make sound but also sense it. So it is used in both speakers and microphones. Two of the piezo elements on the crystal are set to sense vibration and the third one is setup to vibrate. When the helicopter is not rotating the vibration traveling through the crystal hits the other two piezo elements at the same time. When the helicopter is rotating one sensor will have a stronger signal then the other. It is a very efficient design and has a lot finer degree of resolution then the mechanical type. In addition power consumption is greatly reduced as there is no spinning motor to power.
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