What is the airspeed velocity of an unladen swallow?

Here’s a pro tip: If you ever find yourself tasked with a divine quest to find the Holy Grail, make sure you know what your favorite color is. Sadly, Sir Galahad wavered, and thus was thrown into the pits of certain doom beneath the Bridge of Death — a bridge anyone seeking the Grail must pass.

You may also want to brush up on your world capitals, especially Assyria.

At least as far as 1975’s Monthy Python and the Holy Grail is concerned, you’ll also want to know your swallow airspeed velocity. Hell, those coconuts you’re using to ride around the land of the Britons might not even be there if it weren’t for swallows with just the right airspeed velocity. Of course, it would depend on whether they are laden with coconuts or not.

Without saying “ni,” what is the airspeed velocity of an unladen swallow?