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TruTrak Shear Screws

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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sat Jul 09, 2016 5:53 am Post subject: TruTrak Shear Screws

Hi 



A could of days ago,my pitch servo shear screw sheared.  I used one of the two "spare" holes in the cam to install a replacement.  Given I still have one "spare"  hole left for a shear screw I am not too concerned for the moment.



What I would like to know is how does on remove the sheared screw from the cam.



Inquiring mind s need to know.



Les

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carl.froehlich(at)verizon
Guest

Posted: Sat Jul 09, 2016 6:32 am Post subject: TruTrak Shear Screws

Just did this with a Dynon servo (it also has three holes so now I'm down to

the one open hole).



I figure that replacing the cam arm is the easiest way to go if/when I break

off two more shear screws.  For me that means a call to Dynon.



Carl



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timrvator(at)comcast.net
Guest

Posted: Sat Jul 09, 2016 6:36 am Post subject: TruTrak Shear Screws

I had same question. My recollection. From discussion with lucas: The spindle gets replaced. As i recall, it is attached to axle with roll pin.



Sent from my iPhone



 	  Quote: 	
		   On Jul 9, 2016, at 9:53 AM, kearney <kearney(at)shaw.ca> wrote:

 

 

 

 Hi 

 

 A could of days ago,my pitch servo shear screw sheared.  I used one of the two "spare" holes in the cam to install a replacement.  Given I still have one "spare"  hole left for a shear screw I am not too concerned for the moment.

 

 What I would like to know is how does on remove the sheared screw from the cam.

 

 Inquiring mind s need to know.

 

 Les

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=457981#457981

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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sat Jul 09, 2016 9:28 am Post subject: Re: TruTrak Shear Screws

3 replies already. Is this common?

Note to current builders: Trio doesn't have this problem.

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_________________
Bob Turner
RV-10 QB

kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Sat Jul 09, 2016 9:48 am Post subject: Re: TruTrak Shear Screws

Hi



When I spoke to Tru Trak support, I was told that  the shear screw was designed to allow the pilot to overpower the servo or to allow for heavy turbulence.



Now that I know what happened, I am comfortable with being able to gain control over the A/P (with force if necessary). I'll also be careful about control inputs when the A/P is engaged.



Cheers



Les

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carl.froehlich(at)verizon
Guest

Posted: Sat Jul 09, 2016 10:01 am Post subject: TruTrak Shear Screws

Hardly a problem.  The Shear Screw on my Dynon servo worked exactly as

designed (I overpowered the linkage jerking on the stick when we hit a hard

air pocket).



I would be amazed if all autopilot servos did not have the exact same design

feature as the pilot needs to have recourse for jammed servo linkages and

such.



Carl



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Bob Turner

Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA

Posted: Sat Jul 09, 2016 11:42 am Post subject: Re: TruTrak Shear Screws

 	  carl.froehlich(at)verizon wrote: 	
		  



I would be amazed if all autopilot servos did not have the exact same design

feature as the pilot needs to have recourse for jammed servo linkages and

such.



Carl



-- 	




Trio does not.

It uses a slip-clutch. Disengaged, the servo's gears are no longer in the control circuit. Engaged, they are, but under high load (adjustable) the friction plates on the clutch will slip, allowing the pilot to manually over-power the autopilot (in practice not much force is required). If for some reason the clutch won't slip, the first gear is nylon (others are metal) and with somewhat more force, it will strip, releasing the autopilot servo from the control circuit. IMHO a very nice design.

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_________________
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RV-10 QB

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