I would like make a request to add warning about analog servo refresh rate after finding my stupid mistake of using Analog servos.
In the docs, it says digital servos are recommended for better flight stability.So i was just trying to setup a basic old blade 450 3d flybarred heli and i ignored the digital servo suggestion as i only need basic hovering,I went ahead and setup my system and luckily my older analog servos were working okay with default 125hz refresh rate.One of my servo gears felt little sloppy, so i decided to replace one of mine existing analog servo with emax analog servo.As soon i swapped,i found erratic behaviour and within in couple of minutes that servo died.
Then i started searching and found the importance of refresh rate for servos.I then reduced the RC servo rate to 60 hz by changing “RC_SPEED 125” to "RC_SPEED 60"and then my another new emax servo started behaving normally.So if there is little warning about the analog servo refresh rate in the docs,it would be helpful for the newbies.
Now i have few questions:
1)Is it okay to fly for now with 60hz on my analog servos untill i get digital servo?
2)Does tail servo refresh rate also get changed with changing parameter "RC_SPEED " ?
3)what is the difference between RC_SPEED and SERVO_RATE parameter?I couldn’t find RC_SPEED parameter in copter parameter list.