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Old Nov 11, 2012, 05:24 AM
Zen09 is offline
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Germany, HB, Bremen
Joined Jun 2010
925 Posts
It's impossible to apply a complete failsafe system. What if the radio is failing? Like a potentiometer or something. Then the failsafe on the servo side would be useless.

In my opinion, the best failsafe is the one that relies mainly on the operator, and also on a simple mechanical system that you can be very sure it doesn't fail.

Here's my idea:
Firstly you need to have a loaded spring that is ready to push the valve closed. It should be actively maintained by a simple electrical system. Should ANYTHING fail (even electrical power shutdown), the spring does the job.

Now the failsafe system would deliberately let the spring shut off the valve based on operator's input.
This is the key. The logic system should know whether or not you have your hands on the sticks (metal sticks +, metal case -, your hand closes the circuit). When you (the operator) feel that something is not allright, you just get your hands off the sticks.
When you are actually done (wanna take a break), you should press a button while taking the hands off. This way the failsafe would not trigger. I believe it would be extremely safe. It's a rough idea though, it's your job to improve and apply it.
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