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GRT Autopilot

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stephenbehn(at)bigpond.co
Guest

Posted: Wed May 13, 2020 6:35 pm Post subject: GRT Autopilot

Hello,

             I am  just setting up my GRT autopilot in my Lightning. Adjusting servo gains. Roll is  ok but cannot seem to get the aircraft to stop oscillating in pitch without  reducing the servo gain to a very low value. Can anyone with a GRT system let me  know the gain and damping settings they are using to get me started.

 Thanks

 Steve

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davemcc

Joined: 28 Feb 2007
Posts: 74

Posted: Thu May 14, 2020 5:33 am Post subject: GRT Autopilot

Hi SteveWhen I installed my auto pilot in my Esqual I had the same problem and my fix was to have a slight down trim applied while in auto pilot . I still love the Esqual and fly it often. 

Dave from Minnesota

 	  Quote: 	
		  On May 13, 2020, at 9:33 PM, <stephenbehn(at)bigpond.com (stephenbehn(at)bigpond.com)> <stephenbehn(at)bigpond.com (stephenbehn(at)bigpond.com)> wrote:

    Hello,

             I am  just setting up my GRT autopilot in my Lightning. Adjusting servo gains. Roll is  ok but cannot seem to get the aircraft to stop oscillating in pitch without  reducing the servo gain to a very low value. Can anyone with a GRT system let me  know the gain and damping settings they are using to get me started.

 Thanks

 Steve

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rmurrill(at)cox.net
Guest

Posted: Thu May 14, 2020 7:33 am Post subject: GRT Autopilot

I cannot answer your question but,   I am cautiously exploring  the autopilot settings in my new to me Lightning and can forward the existing  settings in my GRT this weekend.  I have not activated in flight so have no  idea of how well the gain and damping parameters perform...

  

 Bob

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boblana(at)sbcglobal.net
Guest

Posted: Thu May 14, 2020 8:57 am Post subject: GRT Autopilot

I still have not got it right. I would appreciate any input.

Bob            

                                                                                        On Thursday, May 14, 2020, 08:38:31 AM PDT, Bob <rmurrill(at)cox.net> wrote:                

                



                



                I cannot answer your question but,   I am cautiously exploring the autopilot settings in my new to me Lightning and can forward the existing settings in my GRT this weekend.  I have not activated in flight so have no idea of how well the gain and damping parameters perform...

 

Bob

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n5pb(at)AOL.COM
Guest

Posted: Thu May 14, 2020 11:18 am Post subject: GRT Autopilot

I have the Tru Trak autopilot set up with my GRT.  I can check to see what I have for the gain and dampening settings, if it will help.  I'll be at the airport tomorrow and can check. 

  

 

  also, you might check with GRT directly.  They are pretty good at answering those questions.

  Regards,

  Bear

  N82PB

 

 

 

  --

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Clouddodger

Joined: 28 Apr 2013
Posts: 5
Location: Arizona

Posted: Thu May 14, 2020 5:55 pm Post subject: GRT Autopilot

What aircraft is the GRT in?Â When setting up the pitch you really need another set of hands to remove the effect of gravity on the elevators. Read the test manual carefully.Â 

Rick

On Wed, May 13, 2020, 9:36 PM  <stephenbehn(at)bigpond.com (stephenbehn(at)bigpond.com)> wrote:



 	  Quote: 	
		      Hello,

 Â Â Â Â Â Â Â Â Â Â Â  I am  just setting up my GRT autopilot in my Lightning. Adjusting servo gains. Roll is  ok but cannot seem to get the aircraft to stop oscillating in pitch without  reducing the servo gain to a very low value. Can anyone with a GRT system let me  know the gain and damping settings they are using to get me started.

 Thanks

 Steve

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_________________
Fly safe and fly fast.

davemcc

Joined: 28 Feb 2007
Posts: 74

Posted: Thu May 14, 2020 6:14 pm Post subject: GRT Autopilot

 	  Quote: 	
		  On May 14, 2020, at 8:31 AM, dave mccorquodale <corky(at)hbci.com (corky(at)hbci.com)> wrote:

Hi SteveWhen I installed my auto pilot in my Esqual I had the same problem and my fix was to have a slight down trim applied while in auto pilot . I still love the Esqual and fly it often. 

Dave from Minnesota

 	  Quote: 	
		  On May 13, 2020, at 9:33 PM, <stephenbehn(at)bigpond.com (stephenbehn(at)bigpond.com)> <stephenbehn(at)bigpond.com (stephenbehn(at)bigpond.com)> wrote:

    Hello,

             I am  just setting up my GRT autopilot in my Lightning. Adjusting servo gains. Roll is  ok but cannot seem to get the aircraft to stop oscillating in pitch without  reducing the servo gain to a very low value. Can anyone with a GRT system let me  know the gain and damping settings they are using to get me started.

 Thanks

 Steve

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n5pb(at)AOL.COM
Guest

Posted: Sat May 16, 2020 10:08 am Post subject: GRT Autopilot

Steve,

  As mentioned earlier, I have a TruTrak autopilot in my Lightning with the GRT avionics EFIS, so the TruTrak set up is different.

   

  If you have the GRT Autopilot, I would go to the GRT website. They have the installation and set up instructions there.

  

 

  www.grtavionics.com

  

 

   go to the "Support" drop down menu, click on the "EFIS manuals and Software" from that drop down window, go to "Autopilot".  From there click on the "GRT Autopilot Installation and Set up".

  

 

  Hope this helps.

  

 

  Bear

  N82PB

  

 

 

 

  --

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