[mythtv-users] hardware recommendation

Joe Menola menola at sbcglobal.net
Wed Jan 31 02:16:50 UTC 2007

On Tuesday 30 January 2007 7:45 pm, Brian Wood wrote:
> What is the airspeed velocity  
> of an unladen swallow?

Airspeed can also be predicted using a published formula. By inverting this 
midpoint Strouhal ratio of 0.3 (fA/U ≈ 0.3), Graham K. Taylor et al. show 
that as a rule of thumb, the speed of a flying animal is roughly 3 times 
frequency times amplitude (U ≈ 3fA).5

We now need only plug in the numbers:

    U ≈ 3fA
    f ≈ 15 (beats per second)
    A ≈ 0.22 (meters per beat)
    U ≈ 3*15*0.22 ≈ 9.9 

... to estimate that the airspeed velocity of an unladen European Swallow is 
10 meters per second. 

What's google? ;)


More information about the mythtv-users mailing list