[Frank_Discussion]

F=ma

With "a" being acceleration, which is not the same thing as velocity squared.

Momentum, however, is mass time velocity. Increase either or both of those quantities causes an increase in momentum. There is a an upper limit on exhaust speed, based on available power and other things, and that limit is reached before the limit on adding exhaust mass is reached. So throwing more mass is typically the more effective thing to do, though not neccessarily the most efficient.

Once again, kind of the best meatball answer I can give you. I'm a mechanical engineer, not a propulsions guy.

[Hunble]

I forgot about time in the equation.

Work is the amount of force over a given amount of time. An Atomic Bomb releases a tremendous amount of energy in just a few milli-seconds and is obviously very powerfull.

However, the energy generated by a river over a period of a year, makes an Atomic Bomb look like nothing.

This article was confusing for this reason. It failed to explain how this new engine could "switch gears" and why that may be important.

Thanks for your help.