---------------------------------------------------------- MurphyMoose-List Digest Archive --- Total Messages Posted Wed 06/07/06: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:59 PM - Elevator VG's (Scott Aldrich) 2. 08:48 PM - Re: Elevator VG's (Ted Waltman) 3. 08:54 PM - Re: Elevator VG's (Scott Aldrich) 4. 09:46 PM - Re: Elevator VG's (Al Paxhia) ________________________________ Message 1 _____________________________________ Time: 07:59:02 PM PST US From: "Scott Aldrich" 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 ________________________________ Message 2 _____________________________________ Time: 08:48:25 PM PST US From: "Ted Waltman" 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@matronics.com [mailto:owner-murphymoose-list-server@matronics.com] On Behalf Of Scott Aldrich Sent: Wednesday, June 07, 2006 8:58 PM 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 ________________________________ Message 3 _____________________________________ Time: 08:54:06 PM PST US From: "Scott Aldrich" Subject: RE: MurphyMoose-List: 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@matronics.com [mailto:owner-murphymoose-list-server@matronics.com] On Behalf Of Ted Waltman Sent: Wednesday, June 07, 2006 9:48 PM 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@matronics.com [mailto:owner-murphymoose-list-server@matronics.com] On Behalf Of Scott Aldrich Sent: Wednesday, June 07, 2006 8:58 PM 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 ________________________________ Message 4 _____________________________________ Time: 09:46:39 PM PST US From: "Al Paxhia" 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 ----- Original Message ----- From: Scott Aldrich To: murphymoose-list@matronics.com Sent: Wednesday, June 07, 2006 8:53 PM Subject: RE: MurphyMoose-List: 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@matronics.com [mailto:owner-murphymoose-list-server@matronics.com] On Behalf Of Ted Waltman Sent: Wednesday, June 07, 2006 9:48 PM To: murphymoose-list@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@matronics.com [mailto:owner-murphymoose-list-server@matronics.com] On Behalf Of Scott Aldrich Sent: Wednesday, June 07, 2006 8:58 PM To: murphymoose-list@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