737 Vortex Gen.
Phil Miller
Can anyone here tell me the purpose of the large vortex generator on the
fuselage side of each engine on a 737-400?
Phil
-----------
Women vs Aircraft
Aircraft don't object to a preflight inspection.
Aircraft come with manuals to explain their operation.
Aircraft have strict weight and balance limits.
Aircraft don't come with in-laws.
Aircraft don't care about how many other aircraft you have flown.
Aircraft and pilots both arrive at the same time.
Aircraft don't mind if you look at other aircraft.
Aircraft don't mind if you buy aircraft magazines.
Aircraft expect to be tied down.
Aircraft don't comment on your piloting skills.
Aircraft don't try and make you crash and burn.
Aircraft don't whine unless something is really wrong.
When aircraft go quiet, it's a bad thing.
May 2001 Pacific Flyer Magazine
Jay
Phil Miller wrote:
>Can anyone here tell me the purpose of the large vortex generator on the
>fuselage side of each engine on a 737-400?
>
It acts as a guard to keep the engine from hitting the fuselage during
heavy turbulence.
Just kidding..........
Actually, a buddy of mine knowledgeable in such matters indicates that
the "Engine Ear" or "Vortex Control Device" delays the airflow
separation in the wing/nacelle interface area to reduce drag at lower
speeds and enhance stall characteristics.
So....... It is there for low speed stall characteristics.
Jay
Jim Knoyle
"Phil Miller" <phi...@REMOVEoptusnet.com.au> wrote in message
news:hglg1u09261hskie1...@4ax.com...
>
> Can anyone here tell me the purpose of the large vortex generator on
the
> fuselage side of each engine on a 737-400?
>
From a Boeing reference guide:
'The VCD, a large vortex generator, stabilizes airflow to the wing
at low airspeed.'
Phil Miller
wrote:
>
>
>Phil Miller wrote:
>
>>Can anyone here tell me the purpose of the large vortex generator on the
>>fuselage side of each engine on a 737-400?
>>
>It acts as a guard to keep the engine from hitting the fuselage during
>heavy turbulence.
>
>Just kidding..........
It's certainly big enough. :-)
>Actually, a buddy of mine knowledgeable in such matters indicates that
>the "Engine Ear" or "Vortex Control Device" delays the airflow
>separation in the wing/nacelle interface area to reduce drag at lower
>speeds and enhance stall characteristics.
>
>So....... It is there for low speed stall characteristics.
Thanks Jay.
Phil
-----------
If lawyers are disbarred and clergymen defrocked, doesn't it follow
that electricians can be delighted, musicians denoted, prostitutes
delayed, cowboys deranged, models deposed, tree surgeons debarked,
dry cleaners depressed, MPs dismembered, and magicians disillusioned?
Phil Miller
Thanks Jim. Any idea why only this aircraft (as far as I know) has them?
ME Incorporated
> On Thu, 13 Dec 2001 17:26:54 GMT, "Jim Knoyle"
> <j.knoyl...@worldnet.att.net> wrote:
>
> >
> >"Phil Miller" <phi...@REMOVEoptusnet.com.au> wrote in message
> >news:hglg1u09261hskie1...@4ax.com...
> >>
> >> Can anyone here tell me the purpose of the large vortex generator on
> >the
> >> fuselage side of each engine on a 737-400?
> >>
> >
> >From a Boeing reference guide:
> >'The VCD, a large vortex generator, stabilizes airflow to the wing
> >at low airspeed.'
>
> Thanks Jim. Any idea why only this aircraft (as far as I know) has them?
I'm love guessing. I can't wait to see if I'm right!
I bet it's because the engine can't be hung lower than it is. Most other
aircraft (such as the 767 or 757) have their engines a bit more lower and
forward of the wing than the 737-3/4/500s.
Since the -3/4/500s are based on (more or less) a re-engined version of
a -1/200, they had to flatten the cowls, mount the engines more in a "stuck
from the wing straight out," instead of hanging down and forward. The air
has problems flowing around the engine and then up (or under) the wing.
Boundary layers and all that.
So, how'd I do? 8^)
jc
Actually, several aircraft have them, including the MD-80, which helps
prevent the tail from being 'blanked' when in a stall situation. I believe
the DC-10's have them as well.
Cheers,
jc
Phil Miller
wrote:
>"Phil Miller" <phi...@REMOVEoptusnet.com.au> wrote in message
>news:ng4i1u0i595irnd77...@4ax.com...
>> On Thu, 13 Dec 2001 17:26:54 GMT, "Jim Knoyle"
>> <j.knoyl...@worldnet.att.net> wrote:
>>
>> >
>> >"Phil Miller" <phi...@REMOVEoptusnet.com.au> wrote in message
>> >news:hglg1u09261hskie1...@4ax.com...
>> >>
>> >> Can anyone here tell me the purpose of the large vortex generator on
>> >the
>> >> fuselage side of each engine on a 737-400?
>> >>
>> >
>> >From a Boeing reference guide:
>> >'The VCD, a large vortex generator, stabilizes airflow to the wing
>> >at low airspeed.'
>>
>> Thanks Jim. Any idea why only this aircraft (as far as I know) has them?
>
>I'm love guessing. I can't wait to see if I'm right!
>
>I bet it's because the engine can't be hung lower than it is. Most other
>aircraft (such as the 767 or 757) have their engines a bit more lower and
>forward of the wing than the 737-3/4/500s.
>
>Since the -3/4/500s are based on (more or less) a re-engined version of
>a -1/200, they had to flatten the cowls, mount the engines more in a "stuck
>from the wing straight out," instead of hanging down and forward. The air
>has problems flowing around the engine and then up (or under) the wing.
>Boundary layers and all that.
Ah, ok. That makes sense.
Thanks,
Graham Stevenson
ME Incorporated wrote:
> > Thanks Jim. Any idea why only this aircraft (as far as I know) has them?
>
> I'm love guessing. I can't wait to see if I'm right!
>
> I bet it's because the engine can't be hung lower than it is. Most other
> aircraft (such as the 767 or 757) have their engines a bit more lower and
> forward of the wing than the 737-3/4/500s.
>
> Since the -3/4/500s are based on (more or less) a re-engined version of
> a -1/200, they had to flatten the cowls, mount the engines more in a "stuck
> from the wing straight out," instead of hanging down and forward. The air
> has problems flowing around the engine and then up (or under) the wing.
> Boundary layers and all that.
I always wondered why the cowlings were that funny shape. Thanks for that.
G.
Limey Dave
"Graham Stevenson" <grahams...@ntlworld.com> wrote in message
news:3C19C7F7...@ntlworld.com...
Yep. purely for ground clearance.
M
jc wrote:
The -80 nose strakes and engine nacelle segmented strakes speak for the -80,
and even allow a quick visual note of the -50...absent the hump of the larger
stab trim motor found on it's bigger brother derivitives, including the 90
models.
A side story.... back when training was done in the airplane in the dark ages
of the late 60's/early 70's...a Texas International DC-9 on a training flight
south of Dallas one night wound up on its back following the mismanagment of a
stall recovery. Is that about enough flyin' for one night?
John Hilt
On Sat, 15 Dec 2001 01:35:34 -0600 Dork M wrote:
>Is that about enough flyin' for one night?
Please ... :-I
"The number one rule of quoting is quote judiciously. Quote only what
is essential to make it possible for the reader to understand what your
posting or email message is about. As a rule avoid quoting an entire
message (signatures and all). It is not judicious to quote a hundred
lines of discussion just to input a single line of one's own."
--
_/_/_/ http://www.uwasa.fi/~ts/http/quote.html
"Careful now, we don't want to learn from this ..." - Calvin.
Bertie the Bunyip
news:qqn62uo4fsoqlomkm...@4ax.com:
> G'day all!
> On Sat, 15 Dec 2001 01:35:34 -0600 Dork M wrote:
>
>>Is that about enough flyin' for one night?
>
> Please ... :-I
>
> "The number one rule of quoting is quote judiciously. Quote only what
> is essential to make it possible for the reader to understand what your
> posting or email message is about. As a rule avoid quoting an entire
> message (signatures and all). It is not judicious to quote a hundred
> lines of discussion just to input a single line of one's own."
>
Depends
Bertie
Limey Dave
"John Hilt" <jh...@offline.no> wrote in message
news:qqn62uo4fsoqlomkm...@4ax.com...
> G'day all!
> On Sat, 15 Dec 2001 01:35:34 -0600 Dork M wrote:
>
> >Is that about enough flyin' for one night?
>
> Please ... :-I
>
> "The number one rule of quoting is quote judiciously. Quote only what
> is essential to make it possible for the reader to understand what your
> posting or email message is about. As a rule avoid quoting an entire
> message (signatures and all). It is not judicious to quote a hundred
> lines of discussion just to input a single line of one's own."
>
You're obviously new to the group!
Limey Dave.
M
John Hilt wrote:
> "The number one rule of quoting is quote judiciously. Quote only what
> is essential to make it possible for the reader to understand what your
> posting or email message is about. As a rule avoid quoting an entire
> message (signatures and all). It is not judicious to quote a hundred
> lines of discussion just to input a single line of one's own."
Actually, it was only an additional 20 lines, but if I can spell correctly,
respond with some pertinent material without making a night of the effort,
and get on down the road with a minimum of fuss (and extraneous material)
my goal is met. I don't feel a moral obligation to keep a reader from
having to scroll down just a few lines every now and then to read a post,
Johnnie-the Posting-Cop.
If this philosophy is at odds with your anal posting techniques in this new
landscape, then shove it up your ass.
And have a great day.
>
>
>
>
Paul Gooding
> No one will want to fly after the long finger of the law gets stuck up
> peoples rear ends at the airport.
and another spake:
> If this philosophy is at odds with your anal posting techniques in this
new
> landscape, then shove it up your ass.
Ah, Christmas. Soon, everyone will forget this happy time, and return to
normal crankiness.
Tarver Engineering
"Paul Gooding" <ppgo...@rocketmail.com> wrote in message
news:jjxV7.82476$Wd.24...@news1.rdc1.az.home.com...
Or in your case, just a crank.
John
Paul Gooding
"Tarver Engineering" <jta...@sierratel.com> wrote in message
news:3c277f83$1...@news.sierratel.com...
That's the old Christmas Spirit, John!
Here's hoping Santa brings you that Kenmore parts manual you've been
wanting.
Ho ho ho!
PG
Tarver Engineering
>
> "Tarver Engineering" <jta...@sierratel.com> wrote in message
> news:3c277f83$1...@news.sierratel.com...
> >
> > "Paul Gooding" <ppgo...@rocketmail.com> wrote in message
> > news:jjxV7.82476$Wd.24...@news1.rdc1.az.home.com...
> > > someone wrote:
> > >
> > > > No one will want to fly after the long finger of the law gets stuck
up
> > > > peoples rear ends at the airport.
> > >
> > >
> > > and another spake:
> > >
> > > > If this philosophy is at odds with your anal posting techniques in
> this
> > > new
> > > > landscape, then shove it up your ass.
> > >
> > > Ah, Christmas. Soon, everyone will forget this happy time, and return
> to
> > > normal crankiness.
> >
> > Or in your case, just a crank.
>
> That's the old Christmas Spirit, John!
Merry Christmas Paul.
May the New Year find you prosperous.
John
Paul Gooding
Same to ya, John.
Bertie the Bunyip
news:3C26887A...@SPAMmindspring.com:
> X-No-Archive: Yes
> As long as you keep you sig short, too.
>
>
Yeah, was too lazy to break out my other newsreader for that, though !
Bertie