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Incidentally - I sold those first two little vee oscillators still in their twin set up at the last aeromodelling swap-meet held at Watford here in the UK. That would be quite some time ago now but some time back, maybe two three years or so, Jo kindly posted some pics of engines she had taken at a model show. I was absolutely convinced that one of them was one 'side' of my twin set up but try as I might I can't find that pic again.
Well 'there you go' Chris - just shows you can learn something every day no matter how old you are You'd have to agree though it's not a 'conventional' slide vale - in model terms that is It would be an interesting challenge to make one.I found a pic earlier of the Perseus engine by Cheddar Models (that is not the engine I was thinking about previously) that has 'slide valves' and a reversing system set to the side of the cylinders - wonder if that was on a similar principal? Thanks for the enlightenment ChrisRegards - Tug