http://www.style.org/unladenswallow/
The speed calculations are based on the Strouhal number http://www.style.org/strouhalflight/
http://www.style.org/unladenswallow/theories/
http://www.style.org/unladenswallow/
The speed calculations are based on the Strouhal number http://www.style.org/strouhalflight/
http://www.style.org/unladenswallow/theories/