Hema... welcome, and we have learned that we can not get some thing from nothing. If energy is stored then it was not being used as would be the design such rocket or spring... Explosive energy can and is channeled into a directional force. A look at the solid fuel boosters of the shuttle program... If you are suggesting a catapult or slingshot... You are not gaining anything. Any catapult would need energy to load it. There are problem with the delivery of such energies. To much force on a weak structure or body could be a problem. Getting into orbit with your head still attached is the best plan... If this is not what you are asking of, please explain...It looks to be a 'Against the Mainstream' Idea. We have a special page just for this sort of thought... mark.