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SYNCHROS "SELSYNS" as Output Devices

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JueBag
(@juebag)
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As posted above I will be using the solution created by Mike Powell. He will publish his updated solution via a Kindle ebook.


   
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JueBag
(@juebag)
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Just an update on  our project:

We managed to get all required parts, did the soldering and wired different indicators. All is working as expected!

Presently we are doing the wiring of 6 D(igital)T(o)S(ynchro)-boards into a big box in order to drive indicators for Airspeed, Vertical Speed, Altitude and Heading. Stand by for pictures!

As for the requested documentation Mike Powell did not publish his EBook yet. The simple reason is that he created another version of a DTS board ( one without the need of an external 400Hz source).  See his blog on http://mikesflightdeck.com/ . We have the DTS boards prior the "cheap solution" , i.e. the one with transformers and heat sink.


   
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Peter Elsler
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@juebag Many thanks for your update.

Standing by for more information / pictures.

Very interested in the new version without the need of an external 400Hz source.

Peter


   
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(@hilldweller)
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I've only just come across this thread, forgive the possible heresy, but looking at the picture on page 1 I immediately thought "one small stepper motor could replace all that".

OK, maybe a geared stepper motor. Maybe with a datum/limit switch.

Rude answers are quite acceptable.


   
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Peter Elsler
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@juebag 

Hello Hildweller.

You are right, a stepper motor could be a way.

I want to remember that those flight instruments are high precision artefacts. The mecanics are quite complex and fragile. I dond´t wont to break up the instruments and maintain their original structure as far as possible, For this reason I prefer to use the original selsyns.

Best whishes,

Peter


   
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JueBag
(@juebag)
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@hilldweller

There is no one way to suit all problems.

You may want to open up a real instrument and drive it with a stepper. It might be easier to 3D print the instrument in the first place.

You migth want to drive the synchro based instrument with a spare synchro. The stepper motor could turn the transmitting synchro. That would have been my plan B in case the DTS board wouldn't work. However, you would need surplus synchros for each and every instrument.

My plan was to leave the real instruments unchanged ( after all the Cockpit is part of a museum!!) and my stock of surplus synchros is limited. That was my reasoning! 

 


   
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Peter Elsler
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@juebag 

You are right. There are different ways that must be considered.

I dond´t have spare synchros, so I have to work with the original ones. At the moment I am working with the ilumination of the instruments on the main panel. There are a lot of instruments and a lot of cablework to do. For this reason, I believe that I will only work on some specific instruments and their synchros. I want to maintain the original look of the "museum parts".


   
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JueBag
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@peter-elsler 

Ups, that sounds like a similar project.

We are working on the crewtrainer of a maritime patrol aircraft (Brequet Atlantic). The Cockpit is a small part of it. In other words we are fortunate to have all instruments and they were used in a simulation environment.

Regarding the number of instruments I decided to limit it to those which are needed for VFR. Amongst many others the artifical horizon might be dropped ( mainly  because it is not directly driven by a synchro).

 

If you want to discuss more about the project I suggest you PM me your email.

 

 


   
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(@hilldweller)
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Posted by: @juebag
 

@hilldweller

My plan was to leave the real instruments unchanged ( after all the Cockpit is part of a museum!!) 

 

Ah, museum. That is good news. We get lots of people in here wanting to do "mission critical" DIY electronics who really don't understand the legal risks.

 

I have a lapsed private pilot's licence and lapsed glider pilot's licence, so I share your enthusiasm. It's probably a terrible situation to be in, do you restore as original or do you just make it look original to the viewers. I think I would go for make it modern where you can't see it on the basis that it is easier to get the parts.

Here in the UK we have some excellent aircraft museums, we were quite good at plane making once but never good at the financial side so all the famous names disappeared one by one. I live 5 miles from where the AVRO Vulcan was made and test flown, a few years ago the whole airfield was sold and is now covered with luxury houses apart for a small plot that has a Vulcan outside and a small museum.

 

https://www.google.co.uk/maps/ @53.3345555,-2.1521219,303m/data=!3m1!1e3

 


   
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Ron
 Ron
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@xxxxxxx Where I used to live they had an annual exhibition. For me and many the highlight of the show was when the Vulcan did its flyover in the airshow. Of course, all this happened a few minutes from the Avro airfield and factory where the fabled Avro Arrow was born and many future NASA engineers were trained.

First computer 1959. Retired from my own computer company 2004.
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Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.


   
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Peter Elsler
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@xxxxxxx GREAT PART OF HISTORY.


   
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Ron
 Ron
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@peter-elsler Yes, if my memory is right a lot of those guys went to the apollo project after the idiots shut down the arrow project. I was lucky to see it flying once. It would still be serviceable today had they let it be.

First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
Sure you can learn to be a programmer, it will take the same amount of time for me to learn to be a Doctor.


   
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