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Hi Folks!

I'm looking for some information with regards to some legacy hardware, the Quad-C from 3DR:
https://3dr.com/wp-content/uploads/2013/08/Quad-C-DIY-Assembly-Instructions-WEB.pdf


I have these ESCs:
https://3dr.com/support/articles/esc_20_amp_with_simonk/

1. Does anyone have a user manual or programming guide for these ESCs?

2. I'm running into a problem where my drone will lose altitude as the battery runs lower. As far as I can tell, this shouldn't happen because the ESCs are supposed to keep a constant output velocity; however, I'm not experiencing this. Has anyone else experienced this problem?

3. Continued from 2, is this a problem with these specific ESCs?

I've attached what I think may be the programming menu for these ESCs but I'm not sure.

Thanks for reading and for any help you may be able to provide! I realise that this drone is really old so I'm kinda grasping at straws here.
 

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