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Elevator VG's

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Wed Jun 07, 2006 6:59 pm Post subject: Elevator VG's

Why do most guys put the stab/elevator VG’s back at the hinge line (on the bottom of stab of course) and not more forward like on the wing?  Is there some guidance on this?  It seems to me it would be like putting the wing vg’s back just in front of the flaps or aileron hinge?  Trying to decide where to put them.  

   

Thanks,  

Scott  

Moose 174

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tedwaltman(at)i1ci.com
Guest

Posted: Wed Jun 07, 2006 7:48 pm Post subject: Elevator VG's

I'm no aerodynamicist, but my guess is that is the critical  spot where the boundary layer needs to be energized, whereas on the wing the  critical lift area is near the front?????

  

 Anybody know the engineering behind the  placement?

  

 Ted



   From:  owner-murphymoose-list-server(at)matronics.com  [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Scott  Aldrich

Sent: Wednesday, June 07, 2006 8:58 PM

To:  murphymoose-list(at)matronics.com

Subject: Elevator  VG's

 

  

Why do most guys put the  stab/elevator VG’s back at the hinge line (on the bottom of stab of course) and  not more forward like on the wing?  Is there some guidance on this?   It seems to me it would be like putting the wing vg’s back just in front of the  flaps or aileron hinge?  Trying to decide where to put  them. 

  

Thanks, 

Scott 

Moose  174

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Wed Jun 07, 2006 7:54 pm Post subject: Elevator VG's

I was just wondering if someone’s VG instructions were to place them there or if one guys saw it and just copied it.  I would think the tail (airfoil) would have the same lift characteristics as any other?  

   

Scott  

         

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Ted Waltman

 Sent: Wednesday, June 07, 2006 9:48 PM

 To: murphymoose-list(at)matronics.com

 Subject: RE: MurphyMoose-List: Elevator VG's  

  

   

I'm no aerodynamicist, but my guess is that is the critical spot where the boundary layer needs to be energized, whereas on the wing the critical lift area is near the front?????  

   

Anybody know the engineering behind the placement?  

   

Ted  

       

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Scott Aldrich

 Sent: Wednesday, June 07, 2006 8:58 PM

 To: murphymoose-list(at)matronics.com

 Subject: MurphyMoose-List: Elevator VG's  

Why do most guys put the stab/elevator VG’s back at the hinge line (on the bottom of stab of course) and not more forward like on the wing?  Is there some guidance on this?  It seems to me it would be like putting the wing vg’s back just in front of the flaps or aileron hinge?  Trying to decide where to put them.  

   

Thanks,  

Scott  

Moose 174

- The Matronics MurphyMoose-List Email Forum -

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paxhia2(at)comcast.net
Guest

Posted: Wed Jun 07, 2006 8:46 pm Post subject: Elevator VG's

I was told to put them there by Jerry at PNW Aero.   I didn't ask why but they did solve the lack of elevator authority at  stall.

 Al

 [quote]   ---

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ScottA

Joined: 05 Jan 2006
Posts: 100
Location: Park City, UT

Posted: Thu Jun 08, 2006 4:42 am Post subject: Elevator VG's

Thanks Al.  I made my own vg’s and have no “instructions” so wasn’t sure if that was the best spot but figured someone must have figured it was.  I will put mine there too.  

   

Thanks again everyone.  

   

Scott  

   

         

  

From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Al Paxhia

 Sent: Wednesday, June 07, 2006 10:46 PM

 To: murphymoose-list(at)matronics.com

 Subject: Re: MurphyMoose-List: Elevator VG's  

  

     

I was told to put them there by Jerry at PNW Aero.  I didn't ask why but they did solve the lack of elevator authority at stall.  

    

Al  

  [quote]    

---

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gyoung

Joined: 09 Jan 2006
Posts: 211
Location: Republic of Texas

Posted: Mon Jun 12, 2006 4:33 pm Post subject: Elevator VG's

Just a SWAG but I'd say it's to keep the flow attached to the elevator at high deflection angles. The effect would be more analogous to the effect of slotted flaps. In this case it is increasing the effectiveness of full up elevator. 

  

 Greg



 

  From: Ted Waltman

Sent: Wed 06/07/06 10:47 PM

To: murphymoose-list(at)matronics.com

Subject: RE: Elevator VG's

  I'm no aerodynamicist, but my guess is that is the critical spot where the boundary layer needs to be energized, whereas on the wing the critical lift area is near the front?????

  

 Anybody know the engineering behind the placement?

  

 Ted



   From: owner-murphymoose-list-server(at)matronics.com [mailto:owner-murphymoose-list-server(at)matronics.com] On Behalf Of Scott Aldrich

Sent: Wednesday, June 07, 2006 8:58 PM

To: murphymoose-list(at)matronics.com

Subject: MurphyMoose-List: Elevator VG's

 

  

Why do most guys put the stab/elevator VG’s back at the hinge line (on the bottom of stab of course) and not more forward like on the wing?  Is there some guidance on this?  It seems to me it would be like putting the wing vg’s back just in front of the flaps or aileron hinge?  Trying to decide where to put them. 

  

Thanks, 

Scott 

Moose 174

- The Matronics MurphyMoose-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?MurphyMoose-List

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