I bet nobody on this website can answer this question. No. 2
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10-01-2014, 07:04 AM
I bet nobody on this website can answer this question. No. 2
What is the airspeed velocity of an unladen swallow?



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10-01-2014, 07:17 AM
RE: I bet nobody on this website can answer this question. No. 2
Golden Wink but coconuts really do migrate.

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10-01-2014, 07:46 AM
RE: I bet nobody on this website can answer this question. No. 2
Hah! I can top that! What is your favorite colour?
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10-01-2014, 08:20 AM
RE: I bet nobody on this website can answer this question. No. 2
Fuuny.

But the question is illogical.

There is no such thing as 'airspeed velocity'; its nonsensical.

Swallows, like any other flying creature use airfoils to generate lift as well as gain it from the change in momentum of the air from the downwash when they flap their wings.

Airfoils don't have an 'airspeed velocity' associated with them.

Lift, however, can be roughly modeled using the basic equation. Flift = 1/2*c*p*A*V^2
where c is the coefficient of lift associated with that airfoil, at a particular angle of attack, Mach number and Reynolds number.
p is the air (or fluid) density
A is the planform area of the wing
V is the velocity of the air passiing over the surface

In adition we cannot take into effect the variable camber nature of a birds wings, the vectoring of its thrust in the form of flapping its wings, etc. This makes it very difficult to determine the angle of attack (AoA) that the swallow's wings stall at. This is the critical AoA which would allow us to calculate the stall speed Vs of a swallow's wings. This would be the minimum airspeed that an unladen swallow, African or otherwise, would need to obtain in order to fly.

Given this, there are just too many variables to make an accurate calculation using basic aerodynamics, but this guy does a pretty good job at finding a realistic estimate for a swallow in flight in dynamic equilibrium.

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10-01-2014, 08:32 AM
RE: I bet nobody on this website can answer this question. No. 2
Did you just go all scientific on Monty Python? The blasphemy! Big Grin

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10-01-2014, 08:32 AM
RE: I bet nobody on this website can answer this question. No. 2
(10-01-2014 07:04 AM)Vosur Wrote:  What is the airspeed velocity of an unladen swallow?



http://style.org/unladenswallow/

Averaging the above numbers and plugging them in to the Strouhal equation for cruising flight (fA/U = 7 beats per second * 0.18 meters per beat / 9.5 meters per second) yields a Strouhal number of roughly 0.13:


... indicating a surprisingly efficient flight pattern falling well below the expected range of 0.2–0.4.

Although a definitive answer would of course require further measurements, published species-wide averages of wing length and body mass, initial Strouhal estimates based on those averages and cross-species comparisons, the Lund wind tunnel study of birds flying at a range of speeds, and revised Strouhal numbers based on that study all lead me to estimate that the average cruising airspeed velocity of an unladen European Swallow is roughly 11 meters per second, or 24 miles an hour.

(31-07-2014 04:37 PM)Luminon Wrote:  America is full of guns, but they're useless, because nobody has the courage to shoot an IRS agent in self-defense
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10-01-2014, 09:01 AM
RE: I bet nobody on this website can answer this question. No. 2
I have a question.

How many fingers am I holding up?
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10-01-2014, 09:03 AM
RE: I bet nobody on this website can answer this question. No. 2
African or European?

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10-01-2014, 09:08 AM
RE: I bet nobody on this website can answer this question. No. 2
(10-01-2014 08:20 AM)Carlo_The_Bugsmasher_Driver Wrote:  Lift, however, can be roughly modeled using the basic equation. Flift = 1/2*c*p*A*V^2
*Lift

(10-01-2014 08:20 AM)Carlo_The_Bugsmasher_Driver Wrote:  A is the planform area of the wing
*platform

(10-01-2014 08:20 AM)Carlo_The_Bugsmasher_Driver Wrote:  V is the velocity of the air passiing over the surface
*passing

(10-01-2014 08:20 AM)Carlo_The_Bugsmasher_Driver Wrote:  In adition we cannot take into effect the variable camber nature of a birds wings, the vectoring of its thrust in the form of flapping its wings, etc.
*addition

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10-01-2014, 09:10 AM
RE: I bet nobody on this website can answer this question. No. 2
(10-01-2014 09:01 AM)LadyJane Wrote:  I have a question.

How many fingers am I holding up?

Always ten, (well five, if you're using one hand) folded or not, unless you have lost some. Do I get a prize?

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