Hi all ! Now this is just a concept to provoke some thought. What about an "open-frame" machine? Say we make a wide "railway line" of chain on a large concrete floor - bolted down to the floor like (maybe raised 100mm or so on steel stand-offs). Then we construct a "trolley" style gantry the width of the fuselage, or wing-chord, which claws it's way along the track with LARGE sprockets, running on the floor with rubber wheels. A strip of angle or some such down the center of the "tracks" to provide steerage for the trolley-gantry Accuracy dependent on the floor being level, but for this project 5mm should be easily accommodated. Cheers Noel
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