robjahnke Posted December 19, 2020 Report Share Posted December 19, 2020 My ADI II Trutrak autopilot head has died. The servos are fine so I only need the head. I will consider buying with servos if the price is right. I can use any Trutrak model that is compatible with the trutrak servos and has altitude hold. Thanks, Rob. rcjahnke at gmail dot com Quote Link to comment Share on other sites More sharing options...
Ed Cesnalis Posted December 19, 2020 Report Share Posted December 19, 2020 I just bought a Dynon AP74 as my Tru Trak died. Dynon reluctantly said the current servos should work fine. I was simply going to use my Dynon EFIS to replace the TruTrak. By adding the AP74 I expect it to be most convenient. The panel opening will have to be enlarged a fraction of an inch. Quote Link to comment Share on other sites More sharing options...
robjahnke Posted December 19, 2020 Author Report Share Posted December 19, 2020 Thanks Ed. I will look at the AP74. Let me know if you have any problems with the install. Rob Quote Link to comment Share on other sites More sharing options...
robjahnke Posted December 19, 2020 Author Report Share Posted December 19, 2020 Hi Ed, I looked at the AP74 info and I don't think that it will connect to the Trutrak servos. Hope I'm wrong. Dynon communicates with the servos via the Dynon Smart Avionics Bus (DSAB) or the Skyview Data Bus, so the servos must be able to connect to the Dynon Bus. The Trutrak servos are driven directly with logic wires coming out of the Control head to drive each of the stepper motors. There are 4 input lines to each Trutrack servo and two output lines from each servo. So unless the AP74 also has provided the wires to drive the Trutrak servos directly, I don't think it will work. Dynon did mention that their servos are PHYSICALLY compatible with other common servos. So it could be that the Dynon servos would bolt in with the same mounting holes as the Trutrak servos. But the way I read it, you will need to replace the Trutrak servos with the Dynon servos to make the AP74 work. I would love to have you tell me I'm all wet about this. Rob PS: Depending on which Trutrack AP you have and what's wrong with it, I might be interested in it for parts in hopes I could make one good one out of two dead ones Quote Link to comment Share on other sites More sharing options...
Warmi Posted December 19, 2020 Report Share Posted December 19, 2020 The answer is ... yes and no. Quote Link to comment Share on other sites More sharing options...
Jim Ragain Posted January 17, 2021 Report Share Posted January 17, 2021 I am doing a panel upgrade and will have a Trutrak head available by the end of March, if that is any help. Quote Link to comment Share on other sites More sharing options...
robjahnke Posted January 17, 2021 Author Report Share Posted January 17, 2021 Thanks Jim. I will keep it in mind. I have decided to go with the GRT SportEX but I need to design a "box" to convert the serial autopilot servo commands to drive the Trutrak servos. If I'm successful, I won't need the Trutrak head. If I'm not successful, I'll be looking for a head. Your timing is perfect. Is yours the ADI II with altitude hold? Quote Link to comment Share on other sites More sharing options...
Jim Ragain Posted April 17, 2021 Report Share Posted April 17, 2021 I have my trutrak head and servos available now if you want it. Quote Link to comment Share on other sites More sharing options...
robjahnke Posted April 17, 2021 Author Report Share Posted April 17, 2021 Thanks for keeping me in mind Jim. I have built a box that listens to the SportEX servo commands and drives the Trutrak servos. I have flown it and so far it seems to be working. I need to do further testing before I can say for sure that it's "done" but it's looking good so far. So it looks like I won't need a Trutrak head. PM me with a price if you will, just in case. Thanks again. Rob Quote Link to comment Share on other sites More sharing options...
DownUnderFlier Posted May 14, 2021 Report Share Posted May 14, 2021 On 4/17/2021 at 12:13 PM, Jim Ragain said: I have my trutrak head and servos available now if you want it. Hi Jim, I'm looking for a TruTrak API 2 unit & servos for spares for our CT2k. Is yours still available ? Cheers, David Quote Link to comment Share on other sites More sharing options...
Jim Ragain Posted May 14, 2021 Report Share Posted May 14, 2021 Yes, but mine is not the same as yours. It is a digiflight II with vertical speed control. I can send you some pictures if still interested. Quote Link to comment Share on other sites More sharing options...
Themark4u Posted November 10, 2021 Report Share Posted November 10, 2021 Hello, does anyone happen to have a Dynon AP74 they no longer need, and is willing to sell? Mark Quote Link to comment Share on other sites More sharing options...
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