I want to have a serious of large rocky balls spawning at the top of a slope that then roll down the slope becoming obstacles for the player. So created a nice rocky ball, turned on the simulate physics. When placed at the top of my slope and I start the game it dutifully trundles down the slope. So I created a static mesh from my ball so that I can use the level blueprint to spawn it in a loop. But the mesh has no physics anymore and just sits at the top of the slope laughing at me 
So how do I create a mesh that retains it’s physics or am I going at this the wrong way?
Thanks