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nickc(at)mtaonline.net
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 Posted: Wed Mar 17, 2010 8:54 pm Post subject: VG's............... |
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Hello Kolb VG users, and enablers,
I flew in a brand new Boeing 737 -900 a couple weeks back. I had a seat just behind the wing. The wing had the now standard invert droop tip on the end, But it also had eight VG’s spacer out on the wing ahead of the flaps. What do you make of that?
All Ears,
Nick Cassara
Palmer, Alaska
[quote][b]
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David Lucas
Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL
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| Posted: Wed Mar 17, 2010 11:04 pm Post subject: Re: VG's............... |
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| Quote: | What do you make of that?
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They're just doing their job keeping the airflow attached longer. Comes into play in different phases of flight. The aircraft I fly, a Fokker 50 twin turbo prop, even has VG's installed inside the inlet duct to the oil cooler which apparently assists in maintaining the flow volume to the cooler by eliminating dead air eddies in the duct which otherwise would have restricted the flow. Great little gadgets !
David.
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Thu Mar 18, 2010 3:52 am Post subject: VG's............... |
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Nick, Once you start looking for them they do seem to be everywhere, they're a great aerodynamic fix for local flow problems. Most likely at that location they help keep the airflow attached when the flaps are extended.
Rick Girard
On Wed, Mar 17, 2010 at 11:53 PM, Nick Cassara <nickc(at)mtaonline.net (nickc(at)mtaonline.net)> wrote:
[quote]
Hello Kolb VG users, and enablers,
I flew in a brand new Boeing 737 -900 a couple weeks back. I had a seat just behind the wing. The wing had the now standard invert droop tip on the end, But it also had eight VG’s spacer out on the wing ahead of the flaps. What do you make of that?
All Ears,
Nick Cassara
Palmer, Alaska
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get="_blank">http://www.matronics.com/Navigator?Kolb-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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zeprep251(at)aol.com
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| Posted: Thu Mar 18, 2010 4:08 am Post subject: VG's............... |
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List,
I finally had the chance to fly a MK3C without VG's after flying mine w/VG's for 2 years.I ain't tak'en em off.
G.Aman MK3C Jabiru 2200A 520 hrs
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ces308
Joined: 03 Nov 2008
Posts: 317
Location: houghton lake ,mi
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| Posted: Thu Mar 18, 2010 11:32 am Post subject: Re: VG's............... |
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I'm with you Gary ! One of the best things I did to the airplane ! I have the Air Wave VG's on mine...94 on the wing and 64 on the tail.
chris ambrose
M3X/Jabiru 105.4 hrs
N327CS
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David Lucas
Joined: 10 Jan 2006
Posts: 79
Location: Europe. based Amsterdam NL
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| Posted: Mon Apr 12, 2010 12:43 am Post subject: Re: VG's............... |
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| Quote: | But it also had eight VG�s spacer out on the wing ahead of the flaps. What do you make of that?
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Just a FYI type update. I was at the AERO 2010 expo at Friedrichshafen in Southern Germany last week and got talking with VG manufacturer 'Micro Aerodynamics' who explained that the VG's ahead of the flap area on the Boeing are to counteract and delay the onset of a shock wave in cruise which in turn sets off a Dutch Roll type instability that all swept wing aircraft are prone to. Apparently the venerable B52 bomber had them also, and with a bit of poetic license there were 52 per side.
The ones ahead of the ailerons are for keeping the airflow attached at low speeds, relatively speaking, just like in a Kolb. (there, now it's Kolb related).
David.
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