Search found 3 matches

by jamesrl
Fri Aug 14, 2009 4:45 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0620: "Wings"
Replies: 141
Views: 35770

Re: "Wings" Discussion

First, this is not really fluid dynamics at the level I'm treating it; just high school level physics where we have F \propto \rho A v^2 (which I derived above in two different ways). If you recall the EDIT part of my previous comment (editted on same day as originally posted), you'll see I understo...
by jamesrl
Thu Aug 13, 2009 12:18 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0620: "Wings"
Replies: 141
Views: 35770

Re: "Wings" Discussion

I'll admit I was cavalier in citing the Lift Force equation as a justification that force from "flapping" should be propto density; however I standby the relationship that as density (assuming other things are constant such as Reynolds number, viscosity, etc) increases it is easier to crea...
by jamesrl
Mon Aug 10, 2009 10:02 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0620: "Wings"
Replies: 141
Views: 35770

Re: "Wings" Discussion

Randall the guy in your comic got this one somewhat wrong. He needs to remember pressure != density when looking things up on wikipedia (especially when the 3 T_{\text{Titan}} \approx T_{\text{Earth}}) . Using ideal gas law PV = NkT (k is boltzmann's constant, N is number of molecules) or densit...

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