Apologies if this is the incorrect forum...
Basically, the key characteristic of my main character’s ship is that, whilst being the smallest of its class, it is the largest ship ever built that can make a rapid, emergency decent into atmosphere to facilitate mass evacuation.
My question is about the limitations on scale. How large can my craft be before the destruction it causes on approach completely undermines the goal of saving everyone?
To clarify, this is Not a question about how it’s propulsion systems effect the environment around it but a question of Size and Speed.
For the sake of the argument we can just say the planet in question is earth, that way we’re using familiar variables.