hello i am new to this forum..i have been set a problem whereby i am asked to design a machine to remove radioactive fuel elements which are contained in cylinders. i am asked to only look at the mechanical aspects (lifting device) of the design. Density and measurements were given and mass of each cyclinder was calculated at 70kg. The machine will be controlled remotely and vision systems can be used. For mobility, i have been looking into radio controlled bomb disposal vehicles and for the lifting devices research has been done on hoist, cranes, telescopic arm, robotic arm etc. The problem section is 4m long and 0.7m wide. The channel is 2.5m deep and full of water and some sludge.The headroom above the floor is only 2m and access is from one side (see sketch). My questions is, what are some of the possible calcuations one can do when designing/selecting an appropriate lifiting mechanism?