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Author Topic: Vortex generators  (Read 365 times)

Offline BigCrate

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Vortex generators
« on: May 18, 2002, 10:36:38 AM »
Ok been reading up on some things lately. Ok the 38 compresses
so easy because its camber is close to the leading edge of the wing right?? Now if the camber was set back a little further back on the wing and sharpen the leading edge more it could reach higher speeds in a dive right?? Ok seeing you can't do this. If vortex generators were adding to the wing it would delay the compression effects some but not all right?? Ok these vortex generators would add drag at lower speeds. So top speed would be effected and maybe climb and turn rates to. But how much so is the ?. Yall just tell me if i'm right or wrong on this. And I will go from there.

Cw
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Offline Maverick

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Vortex generators
« Reply #1 on: May 18, 2002, 12:15:05 PM »
You're wrong. Vortex generators are used to maintain air "contact" on the upper surface of the wing in order to maintain lift at low speeds. They do not increase drag per se, ANY external mod sticking up into the airflow will increase drag, but it keeps the air flow over the wing so it aids in maintaining lift. They cause a spiral air pattern right on the upper surface (hence the vortex) so that the air doesn't  seperate from the wing. Once the air seperates from the upper surface and begins to tumble and oil lift is lost and the wing stalls. Adding a VG to a plane doesn't assist in high speed performance like you were thinking. They are a low speed aid.
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Offline BigCrate

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Vortex generators
« Reply #2 on: May 18, 2002, 09:36:30 PM »
Mav if you are right.. My text book for A&P school are wrong.
heheheheh stupid text book :)

Cw
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Offline Maverick

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Vortex generators
« Reply #3 on: May 18, 2002, 10:24:28 PM »
Quote
Originally posted by BigCrate
Mav if you are right.. My text book for A&P school are wrong.
heheheheh stupid text book :)

Cw
=Twin Engined Devils=


That is from my A&P text book. BTW check out the web site of the company that has the STC for votex generators.

Currently enrolled in A&P program now.

There is no way in the WW2 technology for a plane to modify the camber of the wing. The closest was the leading edge slats that in effect "pushed" camber back by "making" the wing chord larger when they extended. Since there was a slot that allowed the airflow to pass between the slat and the wing to help the air maintain contact with the upper surface the area "increase" is made moot. This also was a slow flight aid, not a high speed "delay onset of compression" solution. You know the planes that had them, the 109, F86 and the Sabre liner are ones that come to mind immediately.
« Last Edit: May 18, 2002, 10:30:30 PM by Maverick »
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Offline Blue Mako

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Vortex generators
« Reply #4 on: May 20, 2002, 10:32:13 PM »
Quote
Originally posted by Maverick
There is no way in the WW2 technology for a plane to modify the camber of the wing.


Flaps modify the wing camber.  ;)
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Offline Tac

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Vortex generators
« Reply #5 on: May 20, 2002, 11:04:56 PM »
and to think I just know how to turn the key and push the little levers and the thing go's!
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Offline Otto

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Vortex generators
« Reply #6 on: May 20, 2002, 11:27:56 PM »
Just a SWAG, but I'd say any 'compression' on the P-38 (or similiar WWII fighter) is coming form a Mach shock wave moving back over that large elevator and freezing the controls.  I'm not saying they go Super Sonic.  The shock wave builds up long before that.
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Offline Toad

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Vortex generators
« Reply #7 on: May 20, 2002, 11:28:18 PM »
Vortex generators are 115V AC, right?
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Offline BigCrate

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Vortex generators
« Reply #8 on: May 21, 2002, 12:50:20 AM »
heheheheh Toad I think they run off 440 AC :)

Cw
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Offline chunder'

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Vortex generators
« Reply #9 on: May 21, 2002, 06:15:59 PM »
Quote
Originally posted by BigCrate
heheheheh Toad I think they run off 440 AC :)

Cw
=Twin Engined Devils=


And after you're done checking the power output of the vortex generators, run into tool crib and get 10 yards of flight line and some K9P  :D
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