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Ed Cesnalis

Which Dynon servos (07 CTSW)

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I'm replacing my Tru--Trak servos with Dynon.  

I'm assuming I want SV42 for the 55 in-lb tourqe.

I don't know if I should get the standard output arm or the extended output arm.  Any help?

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In my 2007 CTSW I used SV32s with the standard output arm for the pitch and kept the capstan part of the Tru-Trak roll servo.  It was a real nuisance getting the roll servo back in but if I remember correctly Tom Baker gave me some hints.  I can send some pictures in a day or two if that would help.  It's freezing rain today so I'm not planning to go to the airport.

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Thank you Jim,  

I would like to see the pictures.  

Should I get one with standard arm and one with capstan?  What about more torque with an SV42 or SV52?

 

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I'll try to get picture but it will be at least a day.

If I remember right, I talked to Stein at SteinAir and the Dynon salespeople about the appropriate torque.  As you know, there are reasons to avoid too much torque.  

Can you tell the torque of the Tru-Trak you are replacing and use that information to inform your choice?  How about Arian Foldan at FDUSA?  I wonder if he'd know the torque requirement?  Or maybe one of the Gutmans at Airtime Aviation?

I use the capstan drive off the old Tru-Trak drive.  I don't know if the capstan drive on the Dynon is the same or maybe has a different radius of swing.  It's been a couple of years.

Sorry I'm not of much better help.  I'll try to get more info for you Tuesday evening if I can.

I think Arian also offered some suggestions on getting the capstan servo back in place.

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Arian was able to help.  I bought Dynon SV42 servos with more torque than the SV32.  I got one with a standard output arm and the other with the Dynon Capstan.

I'm expecting the servos to bolt right in, perhaps needing to change a screw to flathead.  The Dynon AP74 controller looks good in the panel and is more functional than the TruTrak head it replaces.  When I want to upgrade to Skyview I will have the right servos.

Sarasota Avionics has the best deal and selection. $725 / servo.  They drop shipped overnight from a location local to me.



 

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Arian is a good guy.

I had to drill new holes for the pitch servo.  The roll servo bolted right in but was a real close fit to slide in to place.  I benefited because I kept the capstan drive from the TruTrak servo.

I've found my SV32s OK but don't argue if Arian recommends 42s.  

I've been happy with my SV servos.

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3 hours ago, Ed Cesnalis said:

I got one with a standard output arm and the other with the Dynon Capstan.

Ed - I think there are fella's around here who would love to buy your TruTrak servos especially complete with the Capstan, that will offset a chunk of this outlay too.  

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