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The Emthruster: Thrust without reaction?
A recent study building on Forward's ideas is here
Ronan Keane and Wei-Ming Zhang have refined the beamed-core concept, so that it can achieve an effective exhaust speed of 0.69c, more than twice earlier estimates.
I think there would still be a significant problem with radiation (and waste heat) from such a system, but this is significantly better than previously thought.

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RE: The Emthruster: Thrust without reaction? - by stevebowers - 08-05-2014, 10:00 AM

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