Discussions

gyroscopic precession

Posted by Sean Whitney on June 5, 2013 at 7:07pm

Out of curiosity...

I built a helicopter with 900mm blades. The rotor speed is around 1150 RPM. My problem is I am having a hard time getting the helicopter to hover correctly in Loiter Mode.  

I was thinking maybe due to the slow head speed that the 90 degree phasing doesn't work so well with a helicopter turning at a slower head speeds. Meaning that it might not be 90 degree phasing it could be lets say 80 degrees? Is there a way to tune this within Mission Planner?

You need to be a member of diydrones to add comments!

Join diydrones

Replies are closed for this discussion.

Replies

  • Sean Whitney June 19, 2013 at 4:37pm

    Found out by increasing my head speed to 1200 RPM's and increasing Pitch_FF and Roll_FF my loiter works a lot better. The helicopter is no longer out of control feeling. 

  • Brian Prange June 10, 2013 at 9:54am

    Sean you might want to upgrade when this comes out: http://diydrones.com/profiles/blogs/apm-2-6-gps-with-compass

  • Rob_Lefebvre June 10, 2013 at 4:52am

    Hey Sean, I'll see if I can look at your details here in a bit.  What is the heli?  900mm blades are big!

    Is the problem with Stabilize, or just Loiter?

  • Developer
    Randy June 5, 2013 at 10:29pm

    there is a parameter for that although I forget exactly what it's called.  PHANG maybe?   I actually think that is probably not the issue though.  you're using a ublox GPS?  your compass heading is OK?  there's a few possible causes but we should probably see a video and/or log files

This reply was deleted.

Activity