[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? ;)
-jm
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