Hi,
I was wondering if anyone has any tips for good PID starting values for 'copters with longer arms.
I decided to go down the homebuilt frame route with arms of length 50cm (18") as I wanted something bigger and more stable for some photography / photogrammetry work. I chose a 50cm arm length as it seemed to be the recommendation of David Windestal's fantastic scratch-built tricopter at rcexplorer.se
Would I be correct in assuming that the value should probably be smaller that the default as the longer arms will give more inertia and hence 'slower' transfer function?
Any tips would be greatly appreciated.
Kindest Regards
Tim
Replies
T,
While values can vary widely depending on thrust, airframe weight, prop weight, arm length, ESC speed, etc., it would be nice to see a chart hinting at what values will change and in what direction. While the Wiki (http://en.wikipedia.org/wiki/PID_controller) has all of the answers, I agree that some will be best assisted with either a visual or data set to work from. So, who among the minds here has this data to share, or who can provide the layman's guide to PID tuning with respect to airframe changes?