Vance wrote:

The problem with the 'newtonian physics' for the impulse drive, TGT, is that Roddenberry ALSO says that they're fusion engines, and fusion doesn't work that way.
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Where did Roddenberry state that the impulse engines were fusion-powered? In
TMoST, Whitfield and Roddenberry tell us the impulse drive can run for a month before their fuel is exhausted, but nothing about their power source. I vaguely remember reading them described as "atomic powered" and the sheet accompanying the AMT model said they employed the same principal of propulsion as "rockets". But I don't recall ever seeing
Roddenberry describe the original ship as having a fusion-powered impulse drive.