Erich said it short and sweet, and given how this thread's gone, I don't expect you to stop repeating the same idea, no matter how many times we explain why it won't work, but once more: 1. foot-lbs are torque, not force. You don't have ft-lbs. 2. Your 39,312x64 lbs is basically made up math. Those numbers don't correlate to anything meaningful. The energy in each balloon is maximum at the lowest point, and less as it goes up. At the surface, it's whatever energy is embedded in the rubber required to stretch the balloon to its current volume. The volume at any point isn't particularly relevant. 3. You are spending the full lifting force generated filling up each balloon at maximum pressure. No additional energy is created at any point. In a perfect world, you will get motion equivalent to the full amount of energy put in, minus. In reality, you'll get less. Either way, there will be no energy left to extract from the machine.