I remembered the top speed from the whole Firebolt/Nimbus sequence of events, but I don't regard that as even weak evidence for Aristotelian mechanics.
Wind resistance/drag means that there's a 'terminal velocity' even in free fall; change of acceleration simply changes a broomstick+wizard's terminal velocity upwards, doesn't remove it at all.
(Another example: my car operates according to Newtonian mechanics in the real world - but still has a top speed, which is why I'm not setting land-speed records on Nevadan salt flats in my spare time.)
But the terminal velocity should then be a function of the cross-section of the person on the broomstick. Instead the brooms themselves have maximal velocities.
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.