Quadcopter becomes unstable at scales of <=40%

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Rex
Posts: 15
Joined: 22 Jan 2018, 07:45

Quadcopter becomes unstable at scales of <=40%

Post by Rex » 14 May 2018, 07:55

Hi, I've tried scaling the default quadcopter down and noticed that it becomes unstable at <=40% (i.e exploding).

May I know is this due to a threshold on the minimum size required of the components, or is it caused by something else?

Thanks in advance!

coppelia
Site Admin
Posts: 6766
Joined: 14 Dec 2012, 00:25

Re: Quadcopter becomes unstable at scales of <=40%

Post by coppelia » 15 May 2018, 08:30

Hello,

you will have to adjust the quadcopter controller code if you scale the quadcopter.

Cheers

Rex
Posts: 15
Joined: 22 Jan 2018, 07:45

Re: Quadcopter becomes unstable at scales of <=40%

Post by Rex » 15 May 2018, 11:04

Hi Coppella, thanks for the advice.

In general, is there a minimum size each dynamic shape should have if I were to scale models down to really small sizes? I.E 2% of original size, assuming the parameters of the models' child script have been retuned for the new scale

Thanks!

coppelia
Site Admin
Posts: 6766
Joined: 14 Dec 2012, 00:25

Re: Quadcopter becomes unstable at scales of <=40%

Post by coppelia » 18 May 2018, 13:50

This depends a lot on the physics engine you use, and its settings/parameters. For instance, with Bullet, you have a parameter internal scaling that can be adjusted in order to overcome some of the limitations.

Cheers

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