Pendulum problem, help please


I have a bit of a problem that I'd like some help with if possible.

Inspired by I've teamed up with one of my friends who works in bat conservation in order to use drones (quadcopter) to survey bat populations. 

In order to do this we need to attach an ultrasonic microphone and recorder to the drone. We can't attach it directly as there's too much ultrasonic interference from the motors so have decided to try and attach it at a distance of 3m away on some string.

This is the result from that effort:

As you can see there's far too much oscillation going on with the detector beneath the quad which eventually leads to the string getting caught in the motors.

Do you have any ideas for how we might attach the microphone and recorder? They weigh about 300g in total.

Thanks in advance,


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  • I flew with a telescopic (rigid) 50cm "arm" with some RF sensitive equipment attached to the end.  The plastic telescope slide together into about 15cm during landing.

    If you make youself something like that - a lower, rigid point - you'll make it unable to get tangled.

    As for the pendelum effect - length of the line is important.

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