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VGs on vertical stabilizer

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mburdge39

Joined: 24 Sep 2011
Posts: 18
Location: Brookville PA

Posted: Tue Mar 20, 2012 3:38 am Post subject: VGs on vertical stabilizer

Hi all! I am hoping someone can help me with my placement of VGs on my vertical stabilizer. The directions on my Airwave vortex generators state "5 degrees from level flight". Would someone be able to give me the angle, in relation to the rudder, as my Firefly sits on the ground? Installing on the wing & horizontal stabilizer went smoothly and don't want to screw this up.

Thanks!

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Mike
Firefly

Mike Welch

Joined: 13 Feb 2011
Posts: 272

Posted: Tue Mar 20, 2012 3:52 am Post subject: VGs on vertical stabilizer

Mike,



  Wouldn't "level" flight be referenced from your horizontal stabilizer.  Raise you hor. stab. up to level position, 

and that is "level flight".  No?



Mike Welch



On Mar 20, 2012, at 6:38 AM, mburdge39 wrote:



 	  Quote: 	
		   

 

 Hi all! I am hoping someone can help me with my placement of VGs on my vertical stabilizer. The directions on my Airwave vortex generators state "5 degrees from level flight". Would someone be able to give me the angle, in relation to the rudder, as my Firefly sits on the ground? Installing on the wing & horizontal stabilizer went smoothly and don't want to screw this up.

 Thanks!

 

 --------

 Mike

 Firefly

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=368947#368947

 

 

 

 

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 http://forums.matronics.com//files/vertical_stab_195_798.jpg

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mburdge39

Joined: 24 Sep 2011
Posts: 18
Location: Brookville PA

Posted: Tue Mar 20, 2012 4:27 am Post subject: Re: VGs on vertical stabilizer

I guess I have over-complicated things here. With the boom tube angled up during level flight it appeared to me that the horizontal stabilizer was also at an angle. 

Thanks!

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Mike
Firefly

Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Tue Mar 20, 2012 6:48 am Post subject: Re: VGs on vertical stabilizer

I suspect that gap sealing the vertical stab to the rudder would also help. But you've probably already done that.

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Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0

Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.

byoungplumbing(at)gmail.c
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Posted: Tue Mar 20, 2012 7:58 am Post subject: VGs on vertical stabilizer

Hi all! I am hoping someone can help me with my placement of VGs on my vertical stabilizer. 

Mike

Firefly





First of all,,,  do you lack rudder authority?   if no,,  why vg's there?    which side of the rudder or both sides?   in straight and level flight, do you need to hold right or left rudder to center the ball?  maybe you only need one side.     for W&B  it says to have your wing at some angle of attack,,,,    with the wing at that angle,  is the horizontal stabilizer level?   if so you could measure from there.  OR  you could go for a flight and take a level and some shims with you,   while in level flight place the level on the floor  along the center line of the plane.   and see what size of shim is needed to show level, then calculate from there.   OR,  an electronic level on the floor, then push the hold lock button and read the angle.      duplicate that on the ground, then measure.    OR better yet, tuft the tail and have someone take a picture with you in the air.   that way you would be 5 deg from the air flow, not withstanding  where level is.  the wind from the prop may cause some swirling of the air past the vertical stabilizer,  which would be different  if the engine quit, or at an idle on approach.



as for me, I don't lack for rudder authority.    I have considered vg's,,,,   on the wing and bottom of the horizontals... but never  the vertical.   the empennage on the kolbs have a long moment arm  and  accelerated air from the prop,  it should not run out of authority.   



food for thought



boyd young

mkiii

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pj.ladd(at)btinternet.com
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Posted: Tue Mar 20, 2012 9:32 am Post subject: VGs on vertical stabilizer

placement of VGs on my vertical stabilizer>>



You need extra lift on your VERTICAL stab.?



You fly on your side a lot do you?



Pat

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mburdge39

Joined: 24 Sep 2011
Posts: 18
Location: Brookville PA

Posted: Tue Mar 20, 2012 10:57 am Post subject: Re: VGs on vertical stabilizer

Haha! I really just didn't want to waste half a box of VGs! I will just keep them with my other "extras". I will stick with just the horizontal stabilizer & wing.

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Mike
Firefly

beauford

Joined: 25 Apr 2007
Posts: 127
Location: Brandon, FL

Posted: Tue Mar 20, 2012 1:28 pm Post subject: VGs on vertical stabilizer

Brother Mike:



I put 'em on both sides of my Fly's vertical stab...   For two reasons:

1.  Had extra VG's and they were paid for.

2. They looked cool and drew lots of questions from gullible onlookers.



They have been on there for about five years...  Probably have some slight

effect on rudder authority, but likely not as much as Brother Pike's

suggestion

to seal the gap would have.



Not to put too fine a point on it, but suspect the agony over the VG

mounting angle may

not have a high payoff fer ye...   Kinda like using a micrometer on a

buttermilk biscuit...



Worth what ye paid fer it...



Do Not Archive



beauford

FF-076

Brandon, FL



--

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jbhart(at)onlyinternet.ne
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Posted: Tue Mar 20, 2012 3:42 pm Post subject: VGs on vertical stabilizer

At 09:55 AM 3/20/12 -0600, you wrote:

 	  Quote: 	
		  



Hi all! I am hoping someone can help me with my placement of VGs on my vertical stabilizer. 

Mike

Firefly





First of all,,,  do you lack rudder authority?   if no,,  why vg's there?   


	


Additional rudder authority lets one hold greater forward and side slips.  This can be helpful in spilling altitude and enables landing in higher cross winds.



Jack B. Hart FF004

Winchester, IN

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