Reply to post: Re: At last

Re: At last

So if we fire this 2G thruster for 1 second then we have used i kJ of energy (1kW for 1 second). On the other hand, we have produced a force of 3 kN for 1 second. If the mass of this craft is such that the 3 kN thrust for 1s causes the craft to move to a height of 1m against gravity, then we have produced a potential energy of 3kJ with the 1kJ input. Wonderful! Three times better than a perpetual motion machine!