average velocity of a swallow
Now, in the case of the swallow, the Strouhal number is actually less than the average so it doesnât work right out of the box. For all the details, see: Estimating the Airspeed Velocity of an Unladen Swallow. In the end, itâs concluded that the airspeed velocity of a (European) unladen swallow is about 24 miles per hour or 11 meters per second.