1:12 AM
1

Why is the pitching moment coefficient of an airplane said to be constant about the aerodynamic centre of an aerofoil

The answer to this question is very simple. Namely: "Because the phrase 'aerodynamic center' means the point about which the pitching moment coefficient is constant."
But last time I posted a simple answer like that, I got 3 downvotes.
Heck, I'm posting it.
So, more specifically, someone on math.SE asked, "What does 0≠1 mean?"
I posted an answer explaining what 0≠1 means.
Someone else posted an answer explaining why the axiom 0≠1 is included in a certain list of axioms, but which said nothing at all about what 0≠1 means.
My answer got a score of -2, theirs got a score of 3.
So I edited the question to "Why is 0≠1 included in this list of algebraic axioms?"
:D
Anyway, I don't know what lesson to learn from that. Apparently, the question had a secret meaning that was visible to everyone except me.

15 hours later…
4:09 PM
2

I don't know if it's a missing feature, or a bug. But when someone offers a bounty on someone else's post, you cannot tag them in a comment using @. Same goes when someone edits a post that is not theirs and they don't leave a comment.

did they implement/fix it?
asked on meta's tavern, apparently one can but manually (no auto-complete), at least for editing

2 hours later…
6:33 PM
@TannerSwett many time I don't understand why answer are downvoted. Today I begin to ask for comment when a answer I think is OK (maybe not developed enough,but still OK) is downvoted withou comment. Maybe we should enforce comment when downvoting.

@ManuH that has been discussed so many times, and the official SE line is that it will never happen
It would drive negative behaviours, is the usual consensus

7:12 PM
posted on September 23, 2019

Replacement Pilot... Update on Jack's Flight Review... More on Airport IDs... ADS-B during GPS outage?... Expendables Airplanes... PIC vs. PIC discussion... Shoutout CFI Rich... 50th Anniversary of the Fan Jet 500. Uncontrolled Airspace Podcast Daily. Recorded September 18, 2019.