Re: S.S. Valiant Appearance
The big engine at the back of the Valiant isn't a rocket engine in the conventional sense. It's one of the early forms of impulse (which possibly came into use around TOS' 2018) but on a big scale in relation to the rest of the ship.
Kind of like the 'Mystery Ship' from ENT's opening credits (the one that appears right before the Phoenix
Sweet dreams are made of cheese
Who am I to diss a Brie?
I Cheddar the world and the Feta cheese
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