I am trying to figure out a way to provide 180 degree rotation to a pivot point with a single ram. I had drawn up some sketches where the ram would be able to move slightly in the rotational direction of the point. To explain what I am trying to show with out a picture, just imagine trying to spin a tire 180 degrees with a hydraulic ram. Almost in the same manner a locomotive piston turns the wheels on an old steam train. Only problem is as you get closer to full rotation(180) there would be tremendous forces on the structure based on the angle the ram had to apply power. I am assume this has been done before, so if there are any pictures,products,or links you can point me to that would be great. The design is for retractable hydrofoils on concept boat. I also would have many other applications for this 180 degree movement with a single ram,rather than 2 rams. I need the ram for its power, marine use, and adjustment accuracy in tuning the foils while foil borne. Non submerged foils.