Results 1 to 10 of 10

Thread: Gain or setting for AP and IAS climb

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1

    Gain or setting for AP and IAS climb

    I updated to the latest release on my 5600T and have appreciated the new IAS climb option for the AP. However when I engage the AP with this mode and I am already at the desired IAS, the AP commands a slight nose down until it is about 10knots over the set IAS setting. It then pitches back up and resumes the IAS that was set. This takes about 2-3 minutes. Is this by design? Is there a Gain setting that should be tweaked for this? A better configuration to be in before engaging the AP? This is for an RV10.

  2. #2
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Location
    Canby, OR
    Posts
    861
    You can tune the IAS mode with the ASPGAIN, ASIGAIN, and ASDGAIN. Basically AirSpeed P-I-D GAIN.

    I would probably start in your case by adjusting the ASIGAIN because it sounds like its becoming stable but not correcting for the offset.
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

  3. #3
    Thanks Shawn. It does maintain the set IAS, but seems like initially it wants to be over the set IAS and then nose up until it reaches the set IAS climb speed and then maintains it.

  4. #4
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Location
    Canby, OR
    Posts
    861
    Right that's why I think the error window is too large. There is a bunch of PID tuning tutorials online that can be helpful. It's a bit of an art.
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

  5. #5
    Junior Member
    Join Date
    Dec 2014
    Location
    Rockville, MD
    Posts
    7
    Shawn, about that link to the PID tuning tutorials?
    Thanks,
    Jim

  6. #6

  7. #7
    Junior Member
    Join Date
    Dec 2014
    Location
    Rockville, MD
    Posts
    7
    That will teach me....not exactly an old fighter pilot's cup of tea. Guess I'll just keep to my present plan; tweak, observe, tweak, observe....
    Jim

  8. #8
    Try this one: https://www.youtube.com/watch?v=LtocGBngSrA

    It's about PID tuning for a quadcopter but covers the details of P, I, and D very succinctly.

    Shawn, where can we find these gains in the EFIS? I checked the install and pilot manuals and couldn't find a reference.

    Thanks!

  9. #9
    Advanced Flight Systems Shawn McGinnis's Avatar
    Join Date
    Sep 2012
    Location
    Canby, OR
    Posts
    861
    External autopilot users will find the settings under:

    SET -> AP/FD
    Shawn McGinnis

    Advanced Flight Systems
    support@advanced-flight-systems.com

  10. #10
    Coming back to this. My ASIGain was set to the default of .05. Would I increase or decrease this value to correct for the Airspeed climb problem?

Similar Threads

  1. constant airspeed climb/descend
    By amekler in forum General Discussion
    Replies: 8
    Last Post: 01-02-2019, 10:11 AM
  2. Autopilot Gain Adjustment
    By Rob Hickman in forum Technical Support Documents
    Replies: 1
    Last Post: 04-12-2012, 11:44 AM
  3. Getting all those setting correct....
    By jkgoblue in forum General Discussion
    Replies: 2
    Last Post: 04-05-2012, 06:04 PM
  4. AOA for Best Rate of Climb
    By craig23 in forum General Discussion
    Replies: 1
    Last Post: 10-13-2010, 12:52 PM
  5. Any way to sync Dynon D6 baro setting to AFS baro setting?
    By gribbled in forum EFIS Installation Questions
    Replies: 1
    Last Post: 04-08-2010, 04:30 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •