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Date: Wednesday, February 28, 1996 11:56PM
> To Kelly,
> Most of your letters sounded familiar, only two things I want to say:
Draft text Externally fueled Fusion drive
>>Because of the deceleration fuel limitation, it is unlikely that the ship
>>can get to more than a quarter or a third of the speed of light. But
>>that's still a 100,000 kilometers per second. The ship will need to
>>protect itself against impacts. One of the simplest ideas is to push
>>several miles of charged dust ahead of the ship. --
>> How do you shove a few kilometres of clouds? Especially during
>> and deceleration a lot of cloud-rebuilding will be needed.
>Ion cannon. Since the dust is light, it would take little power to throw
>that far ahead. The parts that fall back on the ship can be reused, the
>would need to be replaced. Since you spend most of the mission coasting
>not a big problem.
Just stating the obvious here, I'd note that keeping a dust cloud close
enough to your ship when decelerating would be a big problem with anything
but an ion/fusion drive. With the ion/fusion drive the ion exhaust would
serve the same purpose as a dust cloud since it is being spewed in the
direction of flight.