The Shop > Electronics & IC Programing
Electronic stabilization systems. aircraft el al! Link Trainer.
John Hill:
--- Quote from: vtsteam on May 13, 2022, 10:01:14 PM ---Gold mine:
https://app.aircorpslibrary.com/aircraft/link-trainer
An instructor's manual might actually tell you what the computer response should be to stick movements. I'm guessing the instructor was the computer and controlled the movements?.
--- End quote ---
Thanks for that, of course the Link Trainer is(was) a clever concoction of bellows, levers, cranks and cams so no conventional computer involved. The instructor could do things like select wind, turbulence and generally monitor the student pilot executing a simulated instrument flight. I am sure that manual will make an interesting read none the less.
I have spoken to one of the software gurus and he says we should use SimConnect which he has and is familiar with as it is used in our ATR72 simulator.
Right now I am thinking about hardware!!
John
John Hill:
This is my idea for the "Simulator Simulator"!
vtsteam:
Okay John, looking forward to what you will do.
One small thing I want to suggest that I experienced with flight sim input devices.....commercial plastic rudder pedals were not realistic in their feel because they could be depressed independently. Real rudder pedals are linked (by the rudder) and so they move opposite each other. If you depress one pedal, the other moves in the opposite direction.
If there are wheel brakes they actuate by toe movement on the top of the rudder pedals. I once made my own rudder pedals linked simply by a cable and small pulleys, all mounted on a small wooden box. It really added a lot to the feel of flying a simulator.
John Hill:
Yes, all good stuff. When I made the pedals for our ATR72 simulator I had a dicken's of a job reducing the number of pivots and levers required to get both pairs to move in a acceptable manner! Toe brakes and all!
Link simulator will not have too much in the way of brakes etc as the purpose of the Link Trainers was to train pilots to get accustomed to the instruments.
BTW, I see in an opening page of the Link documentation that the Link was deliberately not stable and instructors were advised not to allow students to spend time with the hood open the idea being that they had to learn to use the instruments to control their 'plane.
I had a revelation today when I began to tote up the number of husky steppers etc required for this project so I glanced around for other methods to move the 'plane. My friendly Chinese purveyor of interesting stuff has pneumatic cylinders for a modest price plus the modern range of click together plumbing make pneumatics rather attractive. It would also be a use for my stash of washing machine inlet valves. There are about 3 or 4 air compressors I could choose from to provide the huff. This would however take me back to square one where I would have to sense the aircraft attitude and somehow integrate that with the FS software.
PekkaNF:
Looking at those pictures I think that appropriate approach for the cockpit attitude measurement depends on mount to a great extent.
If there are orthogonal bearings (axises) simple absolute position rotary encoders (or even with pulse encoders with "neutral" limit switches) look attractive.
If there is a universal joint, resolving three axises and derivating acceleration out of it becomes challenging.
This friend of mine looked up interweb and found new version of the sensor that is a whole lot more easy to calibrate. This video relates to it, I don't know if that software is available or he just cobled up something for fun....anyway nice to see how responsive the signal is.
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