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Motor reversing circuit for trim servo motor using automoti

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charlesdavis(at)iuncapped
Guest

Posted: Sat Aug 05, 2023 9:31 am Post subject: Motor reversing circuit for trim servo motor using automoti

Bob, could you share some details on the actuator and how you 

implemented the fit, please .... I need to achieve something similar to 

this for a Whisper TMG.



Thanks, Charles

On 31/07/23 07:12 pm, Bob Verwey wrote:

 	  Quote: 	
		   



 I have converted a Luscombe manual trim to work with a linear actuator. 12v.

 Momentary rocker switch on control stick.

 While the internet abounds with circuit offerings, I am aware of

 potential "noise" elements and there are probably a few best practices

 to adhere to.



 Any circuit suggestions appreciated.

 Best...

 Bob V

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bob.verwey(at)gmail.com
Guest

Posted: Mon Aug 07, 2023 9:21 am Post subject: Motor reversing circuit for trim servo motor using automoti

This is a well tested solution on LSA airplanes in our part of the world. 

Small trimtab makes it unlikely that a runaway event or mechanical disconnect will lead to catastrophic failure. Furthermore, these airplanes are for day VFR use only.

The unit is a simple 2 wire system and robust, with internal travel limit switches.

[img]cid:ii_ll14yjzy0[/img]



On Mon, 7 Aug 2023 at 01:55, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 12:31 PM 8/5/2023, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: Charles Davis <charlesdavis(at)iuncapped.co.za (charlesdavis(at)iuncapped.co.za)>



 Bob, could you share some details on the actuator and how you implemented the fit, please .... I need to achieve something similar to this for a Whisper TMG.



 Thanks, Charles 	


  I've not been involved in crafting such an

  installation in a light plane. I have worked

  on controls and components for trim actuator

  systems from Lear 55 down thru numerous light planes.



  I've had failure analysis tasks on several

  trim systems and I'm familiar with some

  of the requirements and risks.



  When I read that someone is considering or

  has accomplished a modification to a design

  with a demonstrated or certified history,

  little red flags pop up. Just be sure that

  the proposed system won't cut the stabilizer

  or tabs loose to flop in the breeze.



  



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    of the-best-we-know-how-to-do based

    on physics and good practice.

   

	


-- 

Best Regards,Bob Verwey



082 331 2727

[img]https://docs.google.com/uc?export=download&id=0B5d7rgAInTuTUUZsUjY4QmJsdVU&revid=0B5d7rgAInTuTdDJDaXRFZVh3b3lMa3FWL0s3MFdzc01YRlNvPQ[/img]

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Mon Aug 07, 2023 3:43 pm Post subject: Re: Motor reversing circuit for trim servo motor using auto

Here is the website for the linear actuator pictured above by Bob Verwey.

https://www.linact.co.za/lite-duty-linear-actuators/#Micro_N2

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Joe Gores

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