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Vortex Generators

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Bill Vincent

Joined: 30 Jan 2006
Posts: 84

Posted: Fri Jun 30, 2006 3:27 pm Post subject: Vortex Generators

Hi Gang

 Just received my July 2006, EAA Sport Pilot  magazine.On page 27, there is a story about vortex generators, cuffs, fences and  stall strips. Since there has been numerous discussions on this subject I  thought some of you may be interested in the article.

 Bill Vincent

 Firestar II

 Upper Peninsula of  Michigan

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_________________
Bill Vincent
Firestar II
Upper Peninsula of Michigan

David Lucas

Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL

Posted: Wed Jul 05, 2006 8:21 am Post subject: Re: Vortex Generators

G'day all !



There was also an article about VG's in 'Aviation Consumer' Feb 2006 which was generaly positive over their use. The article refered to their use mainly on Cessna 172 through to the Beech Duke type of aircraft.  One 'letter to the editor' in the April 2006 issue brought up an interesting point re wing loading in turbulence.



The VG's enable the wing to fly at a higher angle of attack and thus lower the stall speed, Vs, but in turbulence you want the wing to stall before the design limit load of the structure is reached. Va (maneuvering speed) gives you protection here.



With VG's the aircrafts Va is lowered proportionally to the decrease in Vs therefore the writer recomended to calculate and record the lowered Va for a VG equipt aircraft.



Sounds logical for the aircraft types mentioned. Guess it applies to Kolbs too.



David.

(The older I get, the smarter I was !)

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Jul 05, 2006 9:11 am Post subject: Vortex Generators

The article refered to their use mainly on Cessna 172 through to the 

Beech Duke type of aircraft.  |

| David.

| (The older I get, the smarter I was !)



Don't think there is much relationship between the aircraft tested and 

a Kolb.



We fly very slow, normally.



If by chance we encounter severe turbulence, there is not problem 

slowing down to prevent overstressing the Kolb.  First of all, your 

body will not be able to tolerate nearly the abuse from turbulence 

that your Kolb will.  Based on some experience, when I have to hang on 

to the bottom of the seat to keep from getting beat up, it is an 

unconditioned response to reduce power and airspeed.



Soon as I can figure out how VG's can improve performance of my mkIII, 

I run right out and buy a set.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Possum

Joined: 12 Jan 2006
Posts: 112
Location: Georgia

Posted: Wed Jul 05, 2006 9:33 pm Post subject: Vortex Generators

At 01:06 PM 7/5/2006, you wrote:

 >--> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>

 >

 >Soon as I can figure out how VG's can improve performance of my mkIII,

 >I run right out and buy a set.

 >

 >john h

 

 I don't have the luxury of flaps, but I think even "you" would be

 impressed - you might even be able to "hover" - like the ole days

 in the chopper.

 $100.00 and a little of the right kind of double sided tape,

 who knows??

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jul 06, 2006 5:13 am Post subject: Vortex Generators

| $100.00 and a little of the right kind of double sided tape,

| who knows?? 



Possum:



Loan me a hundred, "pay day stakes".



Thanks,



hauck

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

slyck(at)frontiernet.net
Guest

Posted: Thu Jul 06, 2006 6:00 am Post subject: Vortex Generators

When John's 912 heads west and he puts a two cylinder John Deere

engine on the Kolb, that's when he will really need some vortex 

generators.

That would sound better than a Harley twin poppin overhead.

-BB do not archive



On 6, Jul 2006, at 9:11 AM, John Hauck wrote:



 	  Quote: 	
		   

 | $100.00 and a little of the right kind of double sided tape,

 | who knows??



 Possum:



 Loan me a hundred, "pay day stakes".



 Thanks,



 hauck

 mkIII

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jul 06, 2006 6:14 am Post subject: Vortex Generators

| When John's 912 heads west and he puts a two cylinder John Deere

| engine on the Kolb, that's when he will really need some vortex

| generators.

 | -BB



Bob B/Gang:



Guess I could go with the 1937 JD B.  It has a 149 cu in two cyl. 

Runs good too.  A little heavy though.  Probably need VGs top and 

bottom of everything.



BTW:  It would sound good.  Running a straight SS stack on it now. 

Have to wear ear plugs when I work it hard.



john h

mkIII



DO NOT ARCHIVE

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

jbhart(at)onlyinternet.ne
Guest

Posted: Fri Jul 07, 2006 12:03 pm Post subject: Vortex Generators

At 06:26 PM 6/30/06 -0500, you wrote:

 	  Quote: 	
		     Hi Gang Just received my July 2006,

EAA Sport Pilot  magazine.On page 27,

there is a story about vortex

generators, cuffs, fences and  stall

strips.

--------------------
	


Bill,



I just received my copy today.  It was a good article, and it pretty much 

indicates what effect VG's can have on a Kolb.  One of the planes shown was 

a "vintage J-3 Cub".



I have seen VG's on thick wing heavy lifter STOL aircraft.  Just before I 

moved to Indiana, a fellow moved a MOOSE, Murphy Aircraft Mfg. Ltd., into 

the communal hangar.   It had vortex generators on top of the wings, on the 

bottom of the horizontal stabilizers, and on each side of the vertical 

stabilizer. I took my step stool down and measured things.  The VG placement 

on the Moose wing was almost identical in proportion to what I have on the 

FireFly.  The wing chord was a little longer than my FireFly but the span 

was 14 feet larger.  It was a good feeling to hangar with such a strong 

beast. 



Before I closed the hangar door for the last time and slipped the key under 

the door, I looked at it again.  It was a rare occurance, that a MOOSE 

showed up at Perryville, Missouri, and I doubt that one will find its way to 

Winchester, Indiana.



Jack B. Hart FF004

Winchester, IN

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