In article , Michael
wrote:

"C J Campbell" wrote
My experience indicates to me that this is indeed the case. Using
some highly sophisticated tools (lawnchair and cold beverage) I have
been able to observe the speeds flown on final many times, and at many
airports. The vast majority are flying final too fast.

Well, OK. But I want to see how you measure the speed of airplanes using a
lawnchair and cold beverage. :-)

It's quite simple. I sit in the lawn chair and face the runway. I
note the beverage level in the container, and begin drinking at a
known calibrated rate as the plane crosses the runway threshold. I
stop drinking as the plane makes its touchdown. By noting the point
at which the airplane touched down and the amount of beverage
consumed, I can easily calculate the average speed flown on very short
final.
Is this not common knowledge?

That's fine as long as it is a stable approach.
What happens when things get interesting?
Do you stop drinking?
Do you take a big gulp?
Do you spew out what you have in your mouth?
Do you throw the bottle/can down, jump out of the chair to a) get out
of the way, or b) run to the aid of the injured?
I guess it all depends on how interesting the approach gets.