Thanks to all who've replied. It appears that I was thinking something along the right lines. For my purposes, the exact figures are relatively unimportant, more the approximate theory.
The reason for the question is that myself and a friend were discussing adding a 3pt hitch to older Farmall tractors (H/SM). Due to me being me I'm intending to have a bash at doing it myself, not because it'll be easier or cheaper but because I want to. Anyhow I was rolling around (just for an added challenge) the idea of draft control and would it be possible and how would you do it. I got to thinking that if one had a (slightly) compressible top link then you could use that motion to actuate a hydraulic valve to initiate draft control. But then how does one adjust the draft control (to control depth, while plowing, say) and so the question of the nature of springs came up. Needless to say I've got a cold and am not actually doing anything, and thus spending hours thinking of ways to bring a 65 year old tractor to a level of technology that was obsolete at least 35 years ago! Sam
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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