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Posted

was wondering ,is there a separate trim motor for rudder trim , or does auto pilot motors work on this trim, under going a GFC 500 conversion and not sure how rudder trim is setup 

Posted

Samo,

Many Long bodies have the rudder trim in place already...

Computing power of the 90s was unable to handle so many feedback loops at the same time...

So... Yaw damping wasn’t a popular option due to cost...  And, because of the computing speed needed in regards to functionality... it has taken 20 years to look at yaw damping again...
 

Don, @donkaye I believe, has yaw damping in his new G500 AP set-up...  See if he has retained the old powered rudder trim when he went to the new system...
 

Tom has me thinking really hard right now... :)

Best regards,

-a-

 

Posted
20 hours ago, flysamo said:

was wondering ,is there a separate trim motor for rudder trim , or does auto pilot motors work on this trim, under going a GFC 500 conversion and not sure how rudder trim is setup 

Here is the rudder trim system.

Clarence

C423357D-6A93-4ECB-B769-50F219EFAA9F.jpeg

Posted

what is the proper way to use rudder trim , do you press on rudder to provide take off trim and adjust setting or can you adjust trip by press trim control with out touching ruder trim, seems to work better when pushing rudder then adjust and seems to work best preadjust trim before take off, when there is no load,    once Gfc 500 is installed will it do trim adjustments, comments from a Guy who had a laim KFC auto pilot which has never been up to par.

Posted

One would have to look in the POH for the ‘proper’ way to use rudder trim...

1) While stationary on the ground... the nose wheel supplies a ton of resistance to moving the rudder...

2) Using the rudder trim while stationary, will overpower the nose wheel resistance...

3) Do you want to Do that to your mechanical systems? probably not.... or not often...

4) To be kinder on the system, set it while in motion...

5) Setting it while in motion, can cause other problems... like distraction of various other types...

6) So... assisting the system with pressure on the pedals would be thoughtful...

 

The old rudder trim from the 90s was built incredibly strong... it has survived a long time of me setting it while I’m stationary... or using it to correct drift while taxiing on a slanted taxiway...
 

PP thoughts only, not a mechanic...

Best regards,

-a-

Posted
On 10/2/2020 at 7:40 AM, flysamo said:

was wondering ,is there a separate trim motor for rudder trim , or does auto pilot motors work on this trim, under going a GFC 500 conversion and not sure how rudder trim is setup 

The rudder trim continues to operate as it would before the GFC 500 installation.  I personally use full right rudder trim on takeoff.  Above 800 feet I turn on the YD and continue the climb.  When I level off and accelerate I, turn off the YD and center the slip/skid indicator with rudder trim, then re-enable the YD.  This puts the least constant torque requirements on the YD servo.

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