I think I bit off more than I can chew. From looking at other configurations on the forums I may have built a quad that seems to be on the XL side.
frame: Personal monstrous design. 3/4 Aluminum tubing rigging
esc: Turnigy Plush 60A
motors: E-Flite Power 32 770kV
propellers: APC 13x4 Electric
motor to motor distance: 36 inches
battery: Turnigy 20-30C 4S 5000 mAh
total weight: ~8 lbs
radio: E-Flite LP5DSM
Can't seem to get this thing in the air more than 30 seconds at a time and when it's in the air, it's a constant struggle to keep it from hurting me and my amused and frightened coworkers. It feels like the system is not exerting its corrections quick enough to reach a level flight and I have to always compensate through my controls and end up over correcting. Usually ends badly for me or the quad. It drew blood couple times.
I've been digging through the forums to see if there is any successful quad that resembles mine and follow its PID settings but have yet to find one.
Can anyone start me off on the right path?
I have attached the settings that I'm crashing on.
Someone pointed out that I may need to move my ESC's away from APM2. So I have done that. Need to have a testflight once the props arrive. Also suggested by the same person that I might want to put APM2 on more solid footing rather than suspended. Will try that as well.
Yeah, thought about slimming down the frame. Will need to scrounge up some money before going that step though.
Let me know how your behemoth takes shape and behaves. If you get it tuned well share the joy.
I flew my 1000mm frame late last night. It leaned to the front right corner when trying to take off. Giving it more throttle quickly got it of the ground good though. I need larger landing gear to stop it from leaning.
Once it was off the ground it flew fairly stable with the default PID settings considering it is over twice the size of the quad that the default PID were setup for :P
I will be doing the PID tuning soon. I have increased the logging and got the "APMLogVisualizer" to help see what the output is.
I have read a lot about PID controllers and how to tune them now. I think I have a good grasp on what to do to be able to tune this thing now.
However, I had a very big problem with Yaw.... It appears that I have no Yaw control at all. The motors speed up as they should but nothing happens. The props are not the correct size (smaller pitch value than they should be), so that could be part of it giving less thrust than it should be. We'll see.
I broke some of my temporary plexiglass frame. I am going to try making it out of thin plywood next and try flying again.
Yeah, at one point, I believe I hat the RateP to max but that wasn't helping much.
Someone is lending me their DX8 in few days so will try out the in-flight tuning feature.
This is a good reference for Rate and Stab PID tuning on multicopters... http://aeroquad.com/showwiki.php?title=PID+Tuning
My quad is stable, but I'm about to put it through this process and see what I get. Then compare it to what I had.
Yeah, I read that.
Seems like most tuning requires you to hold the quad in your hand. It gets pretty hairy with my monster. I will need to come up with some rig rather than holding it in my hand.
What's your quad's spec?