>
> If the bat is ~1000m long it has a mass of ~10^9 kg. If it falls from a
> height of ~100m, its crash has an energy ~10^12 J. That is, ~1000 tonnes
> of TNT. Most of the energy wound be directed downwards: enough for a
> substantial local earthquake? If so, I don't think we want the crash
> close to the defences.
>
Let's not get too caught up in the physics of the Bat or we'll expose the
thing for the impossibility it is:-) I mean after all something that big
that can fly? Yet only moves as fast as a horse? Basically we're talking
MGF here. Sure the crash will shake the foundations but it doesn't have to
cause earthquake damage unless the story demands it.
Oliver
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