I have attached a link to a short file that exposes the noise that I am referring to. I have only flown enough to go through my ONE battery a couple of times. However, this noise occurs at every startup. It sounds to me like all motor power is being affected as there are never any gyrations when this occurs. It appears to happen so quickly that there is little or no visual response.
The machine seems to fly fine and so far hasn't dropped out of the sky.
But I am concerned enough to be leary about flying very far away. Has anyone noticed this issue??

http://youtu.be/LaSbzsCH1Qs

That is by design, so there's nothing to worry about.

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mike@singerscre Posted at 2015-5-18 10:48
That is by design, so there's nothing to worry about.

Thanks. It was a little unnerving at first but several subsequent flights have gone very well.

merkelck.verizo Posted at 2015-5-19 05:08
Thanks. It was a little unnerving at first but several subsequent flights have gone very well.

It is designed that way to ensure that the propellors are tightened.

Understood. Now I will have to worry if I don't hear it!!!  Thanks