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Author Topic: Need another aero-d discussion...  (Read 5222 times)

Offline Stoney

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Need another aero-d discussion...
« on: June 27, 2010, 10:18:22 PM »
After that recent spat of over-the-top aerodynamics discussions, I find myself jonesing for another.  Anyone got anything cool to talk about?
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Offline dtango

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Re: Need another aero-d discussion...
« Reply #1 on: June 27, 2010, 11:47:43 PM »
LOL!  I'm too busy photoshopping :P.  How about "what generates lift?"    :t  :t  :t  Very evil topic for those that have an inkling for how evil it is.

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Offline Stoney

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Re: Need another aero-d discussion...
« Reply #2 on: June 28, 2010, 12:13:56 AM »
Quote from: dtango on June 27, 2010, 11:47:43 PM
LOL!  I'm too busy photoshopping :P.  How about "what generates lift?"    :t  :t  :t  Very evil topic for those that have an inkling for how evil it is.

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I think we tried that one last year.  I remember because I was chastised for offering up "angle of attack" as an answer.
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Offline fbWldcat

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Re: Need another aero-d discussion...
« Reply #3 on: June 28, 2010, 12:14:10 AM »
Quote from: dtango on June 27, 2010, 11:47:43 PM
How about "what generates lift?"    :t  :t  :t  Very evil topic for those that have an inkling for how evil it is.


Magic?
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Offline Bronk

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Re: Need another aero-d discussion...
« Reply #4 on: June 28, 2010, 04:58:43 AM »
Quote from: fbWldcat on June 28, 2010, 12:14:10 AM
Magic?
More precisely ... witchcraft.  :noid
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Offline Mace2004

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Re: Need another aero-d discussion...
« Reply #5 on: June 28, 2010, 06:42:47 AM »
No no no.  Not angle of attack or magic or witchcraft, that's foolish and it's really quite simple.  As the wing moves through the air it attracts a bunch of little critters in the air called Bernoullis (also known as "Lifties").  They run around on the top of the wing to hold it up.  When the Bernoullies get scared or upset because of things like having the wing tilt too much causing the air to get rough and tumble they jump off and the wing stalls.  If you get the airflow smooth again they'll come back and hold your wings up again.  Of course you can't see Bernoullis....they're invisible....obviously.
« Last Edit: June 28, 2010, 06:44:31 AM by Mace2004 »
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Offline RTHolmes

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Re: Need another aero-d discussion...
« Reply #6 on: June 28, 2010, 07:04:36 AM »
me! me! I got a good one for ya :)


there was a recent post about the Stipa-Caproni Flying Barrel, which I've never seen before so I had a quick look at http://en.wikipedia.org/wiki/Stipa-Caproni. I noticed this:

Quote
The duct itself had a profile similar to that of the airfoils, allowing the fuselage to provide the airplane with additional lift

Quote
and the additional lift provided by the airfoil shape of the interior of the duct itself allowed a very low landing speed of only 68 km/h (42 mph) and assisted the Stipa-Caproni in achieving a higher rate of climb than other aircraft with similar power and wing loading.

would the aerofoil profile of the duct provide any lift? and if it would, surely it would cancel out as the duct is circular and the lift component would therefore resolve to 0? or is it just wikiBS?

:)



edit:  :lol mace
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Offline Charge

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Re: Need another aero-d discussion...
« Reply #7 on: June 28, 2010, 07:54:05 AM »
"would the aerofoil profile of the duct provide any lift? and if it would, surely it would cancel out as the duct is circular and the lift component would therefore resolve to 0?"

Any tube with positive AoA will generate some lift and especially if the tube has a profile it will provide more lift which is not cancelled out, no matter which way the profile's camber is set or if it is symmetrical. If the tube is not symmetrical but the profile's camber is always "up" both on lower and upper side of the tube it will provide even more lift.

That's my take on it.

-C+
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Offline uptown

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Re: Need another aero-d discussion...
« Reply #8 on: June 28, 2010, 07:56:07 AM »
Umm yes. I need to know what the coefficient would be if the left rear elevator is shot off of a C47 at 65'. And how does the effect the vertical trajectory during troop drops.  :headscratch:
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Offline dtango

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Re: Need another aero-d discussion...
« Reply #9 on: June 28, 2010, 09:48:03 AM »
Quote from: Mace2004 on June 28, 2010, 06:42:47 AM
No no no.  Not angle of attack or magic or witchcraft, that's foolish and it's really quite simple.  As the wing moves through the air it attracts a bunch of little critters in the air called Bernoullis (also known as "Lifties").  They run around on the top of the wing to hold it up.  When the Bernoullies get scared or upset because of things like having the wing tilt too much causing the air to get rough and tumble they jump off and the wing stalls.  If you get the airflow smooth again they'll come back and hold your wings up again.  Of course you can't see Bernoullis....they're invisible....obviously.

They really do exist.  I have proof!  Look, the mother of all Bernoullis'!



Tango
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Offline fbWldcat

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Re: Need another aero-d discussion...
« Reply #10 on: June 28, 2010, 10:52:32 AM »
Quote from: Bronk on June 28, 2010, 04:58:43 AM
More precisely ... witchcraft.  :noid

Hogwarts?
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Quote from: Shuffler on April 07, 2011, 10:37:33 AM
Landing is overrated.
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Offline Ex-jazz

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Re: Need another aero-d discussion...
« Reply #11 on: June 28, 2010, 10:57:14 AM »
Quote from: Stoney on June 27, 2010, 10:18:22 PM
After that recent spat of over-the-top aerodynamics discussions, I find myself jonesing for another.  Anyone got anything cool to talk about?

Hmmm...

How to model the airplane directional stability in simulation?
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Offline Wmaker

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Re: Need another aero-d discussion...
« Reply #12 on: June 28, 2010, 11:07:50 AM »
Quote from: Ex-jazz on June 28, 2010, 10:57:14 AM
Hmmm...

How to model the airplane directional stability in simulation?

I know very little about coding, but mathematically couldn't/shouldn't it be treated as a symmetrical airfoil? IE. the fuselage and the vert stab.

I know, all I did was state obvious. :( Won't even try commenting on the coading part. :)
« Last Edit: June 28, 2010, 11:13:03 AM by Wmaker »
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Offline hitech

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Re: Need another aero-d discussion...
« Reply #13 on: June 28, 2010, 12:34:00 PM »
Quote from: Stoney on June 27, 2010, 10:18:22 PM
After that recent spat of over-the-top aerodynamics discussions, I find myself jonesing for another.  Anyone got anything cool to talk about?

Why some planes roll more then others when applying rudder?

HiTech
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Offline chewie86

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Re: Need another aero-d discussion...
« Reply #14 on: June 28, 2010, 12:45:28 PM »
Quote from: hitech on June 28, 2010, 12:34:00 PM
Why some planes roll more then others when applying rudder?

HiTech

I shoot:   Different distance between the wings' and rudder's aerodynamic centers? 
EDIT: (on the Z axis)
« Last Edit: June 28, 2010, 12:49:35 PM by chewie86 »
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