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<b>Message ID:</b> 16049 <br/>
<b>Date:</b> Mon Mar 13 22:02:44 GMT 2000 <br/>
<b>Author:</b> Danny Craigg <br/>
<b>Subject:</b> Ack, more math!  Need Ale! <br/>
<br/><br/>
<div id="ygrps-yiv-143317093">John wrote:<br/>
<br/>
-----------------------------------<br/>
D = Cd*pi*r^2*rho*Vo^2<br/>
<br/>
Cd = coefficient of drag of the swallow<br/>
pi = 3.1415...<br/>
r = radius of bird cross-section (approximating as a circle)<br/>
rho = viscosity of air<br/>
Vo = velocity<br/>
<br/>
For steady state flight, D (drag) = T (thrust), so:<br/>
<br/>
Vo = sqrt(T/Cd*pi*r^2*rho)<br/>
-----------------------------------<br/>
<br/>
Ack!  Must... get... more... ale...  Way... too... sober...<br/>
<br/>
Raiel</div>