1. The problem statement, all variables and given/known data I'm to design a crane, and therefore I need to find the reactions in the jib and also make the crane stable. 1. I need to find the max. load that the crane is able to lift. Therefore i have to find the reactions where the horisontal and vertical boom is meeting. 2. I need to find out the moment in the bottom of the vertical beam in order to make the crane stable. Now i should have the max weight, and therefore the weight of the stone. And it should be easier to calculate 2. Relevant equations 3. The attempt at a solution The sum of all the forces needs to be 0. F=0 The angle is 90 degrees, so that is not going to be a problem The wire from the horisontal beam is only ½ m. But since i don't know the weight of the stone, I don't know where to begin?