Do I need a gyro with the K&S Hovercraft?

The Hovercraft, the servos are included?´When not what for servos I need (normal size or micro) I have read that I need a gyro? What for a gyro I need? I don´t understand for what is the Gyro in the hovercraft!
First, Servos are not included.
Servo's recomendation is KS2128 K-DG13servo. However, it is ok if about same ability. Weight--- 12.8G, Speed---0.17SEC, Torque---1.9kg. Gyro is for easy to play since very good performance and fast! Gyro recomendation is JR G170. 

However, use 4 cell lipo battery. 3 cell is not good.
 

 
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