Originally Posted by
ShannonM
Around 500 Hz for a 1" diameter thin-walled tube around 22-24" long, according to the people who make wind chimes. Q would be quite narrow, or tubular bells couldn't work.
As this is almost 200 times the pedaling frequency, it would seem to be irrelevant to the discussion.
Why do you think it matters?
An empty tube is a horrible model for the side-to-side motion of a bottom bracket. Not even close.