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Big quads


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Fran Rivas commented on Chris Anderson's blog post Penguins like Rovers when they're dressed up like chicks
""
Nov 3, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"My experiences today  with loiter:

V 3.1.5:
- Scott parameters.
- No too windy but variable.
- When no wind it seems stable, keep position quite well.
- When it need to fight against wind it destabilizes quickly.

V3.2 beta RC12:
- Scott parameters…"
Oct 23, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"but I think filter fusion improvement depend on AHRS_EKF_USE = 1"
Oct 23, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"Geat Scott!!!

right now i was to going to test loiter wiht your params in v 3.1.5, but after reading this... maybe I should try with the 3.2...





you're using the same parameters as 3.1.5? I guess you've enabled EKF, right?"
Oct 23, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"I just tested your parameters on my machine (performing first the changes for type X frame) and behaves very well in stabilize and AltHold. It has been a indoor test because here it's night, tomorrow I will try to test it outside with loiter.

Thank…"
Oct 22, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"I do not know if X type offer advantages, but it was one of the changes I had planned to improve my setup, and if it's working for you...

how stable it is in Loiter with that parameteres?"
Oct 22, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"6S.
Another difference is that I am using "plus" frame type instead of X."
Oct 22, 2014
Fran Rivas replied to Scott Penrose's discussion My Heavy Lift U8, Pixhawk - Sweep heads South
"Thank you very much for sharing!!! 
I'll try this parameters and share my experiences and possible modifications.

What U8 are you using (100, 135, 170)? mine are 135."
Oct 22, 2014
Fran Rivas replied to William Cox's discussion Heavy Lift Quadcopter Pixhawk/U8 Tiger Motor Problems
"In my previous reply I forgot the link to the APM forum thread:

http://ardupilot.com/forum/viewtopic.php?f=80&t=9985"
Oct 22, 2014
Fran Rivas replied to William Cox's discussion Heavy Lift Quadcopter Pixhawk/U8 Tiger Motor Problems
"Hi, William

Yes, the solution is out there, I hope someone wants to share it.

In this thread I share my PIDs for stabilize, and someone suggested me some parameters values. I'll try it."
Oct 20, 2014
Fran Rivas replied to William Cox's discussion Heavy Lift Quadcopter Pixhawk/U8 Tiger Motor Problems
"Hi,

I'm tuning a large quad based on U8 motors.  After a hard tuning process i have a really nice solution for stabilize mode, but I can not find a good loiter PIDs. 

My setup:

1100 mm motor to motor. Home made carbon fiber arms frame.
Quad + con…"
Oct 16, 2014
Fran Rivas commented on enzo vinko criado's photo
"Hi, Enzo
I've the same problem than William: my quad fly very well in stabilize mode (after a hard PID tuning work) and quite well in AltHold, but it's unstable in Loiter.My setup:

1100 mm motor to motor.T-Motor U8 135 kv.T-Motor 30A opto pro ESCs.…"
Oct 15, 2014