Firslty I should explain that I am neither a highly qualified engineer or physicist howver I am hopefull one of you out there might be able to help. We have an 'A' frame with two legs attached to the deck on pins, the 'A' Frame is moved forward and backwards by two hydrualic rams positioned behind the frame and operating on each leg, the rams are mounted on pedestals behind the leg pivot points, again attached to the deck. A winch is used to pull a wire through a block, the winch is mounted between the legs of the 'A' frame. The wire goes to the head of the frame and then down into a moon pool where the load is suspended. The head of the frame is positioned perpendicular to the CL of the moonpool with its mounting points behind it. To calculate the SWL at the head of the frame I would normally look at the lead angle of the wire and the load giving a mutliplying factor of around 1.75t at the head. My question is, does the load on the mounting points get spread over all 4 (two with the rams and two with the frame pivots)? My overall intention is to determine the maximum load lift the setup can maintain but I am not sure what effect the 4 point mounts have on the overall load capacity.