hustler
Posts: 308
Joined: Sat Jun 09, 2001 1:13 am

What Does The Photographer Mean By This...

Thu Nov 14, 2002 5:26 am

When you look at the comments of this photo the photographer says:

note turbulence in intake


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Photo © Pedro



Is that little white stream of air what turbulance looks like in the air. I'm not sure I understand what he is saying. Can someone explain?

Thanks,
...Hustler.
 
Ikarus
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 5:47 am

I think he's trying to point out the condensation in the engine intake. It has nothing to do with turbulence.

Regards

Ikarus
 
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Bruce
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 6:47 am

Isn't it dangerous to stand that close to an engine operating at 100% thrust? I mean, he could have gotten sucked in!!!!
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
Lindy
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 6:51 am

He wasnt that close. He was probably standing close to the nose gear of this aircraft and used little zoom on it. If I remember correctly. Safe distance to stand by working engine on 737 is 13 feet I dont know whats the distance for 747.

Rafal
BWIADCA - Nikon D100
 
trnswrld
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 6:56 am

Yeah it may be 13 ft at idle, but what about up to 100% throttle?? Remember that engine isnt just turning at idle. I really have no idea about safe distances from the engine while running, but its gotta be a lot more than 13ft from a full throttle RB211. Correct me if im wrong.
 
raggi
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 7:57 am

simply amazing picture!

raggi
Stick & Rudder
 
heavymetal
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 8:14 am

I think the picture sucks.





 Wink/being sarcastic  Big thumbs up

 
aak777
Posts: 277
Joined: Thu Apr 26, 2001 10:07 pm

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 8:18 am

If air flows fast enough it could turn turbulent, but that stream line looks laminar to me. Any way I'm sure that the engine intake is designed to prevent turbulent flow
 
VC-10
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Joined: Tue Oct 26, 1999 11:34 am

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 8:36 am

When an engine is run at high power the pressure drops in the intake and any excess moisture in the air condenses out.

At high power the danger area extends to 25 feet
 
heavymetal
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 9:12 am

A question for either the photog or anyone who has ever been in this arraingement....from the presumed distance the photographer was from the intake, would he be feeling more than a gentle breeze blowing past him and into the engine at this point?


 
VC-10
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Joined: Tue Oct 26, 1999 11:34 am

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 10:49 am

If he felt any sort of breeze, he would be too close.
 
airplanetire
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 11:22 am

What keeps the aircraft from going anywhere when it is going at 100% thrust? I don't think the things that go under the wheels would do it. Also, how is the aircraft not damaged from not going anywhere? I would imagine that the landing gears are under a lot of strain with engines running at 100% thrust and not having the plane go anywhere. But then again, landing gears are probably pretty strong because they can withstand a plane landing and that has to be a lot of pressure on them. Amazing picture though!
 
fly_yhm
Posts: 1647
Joined: Fri Dec 01, 2000 1:12 pm

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 12:34 pm

Well Heavy Metal I happen to think its blow Smile/happy/getting dizzy
Where will you spend eternity? He,s more real then you think!!!!!
 
hkgspotter1
Posts: 5750
Joined: Fri Nov 04, 2005 12:43 pm

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 12:54 pm

For a close up you could get tied to a tow truck  Nuts
 
hmmmm...
Posts: 1959
Joined: Tue May 18, 1999 8:32 am

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 1:08 pm

Going full blast but not moving must put some part under a lot of strain. Anybody know what point on the plane they use for securing the beast?
An optimist robs himself of the joy of being pleasantly surprised
 
hmmmm...
Posts: 1959
Joined: Tue May 18, 1999 8:32 am

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 1:50 pm

After thinking awhile, it's probably much simpler. I suspect the wheels brakes, perhaps augmented by chocks, do the job.
An optimist robs himself of the joy of being pleasantly surprised
 
T prop
Posts: 910
Joined: Tue Apr 03, 2001 4:33 pm

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 2:14 pm

Most likely only the #3 engine is running at max power. The brakes have no problem keeping the aircraft in place.

T prop.
 
VC-10
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Joined: Tue Oct 26, 1999 11:34 am

RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 6:06 pm

Only one engine is run a high power at a time, incidentally it is not full TO power but a proportion of it. While this engine is at high power another engine at the other side will be at fairly high power in an effort to balance the the a/c.

The a/c is normally restrained on the brakes only. When I run engines at LHR I taxi the a/c to r/w 23 block 40, set the park brake and away you go.
 
babaero
Posts: 416
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 6:22 pm

Running engines at full power is no problem.

Chock the wheels and fill the fuel tanks.

Most a/c with correct amount of fuel will stay put. May move a little but no problems.


757 now theres a story...
 
Panman
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RE: What Does The Photographer Mean By This...

Thu Nov 14, 2002 11:52 pm

VC-10, do you do the trick that the cola airline do (or at least they did for the 4 months last year that I worked with them). Ask permission from the tower to do an idle power engine run. Then when an aicraft taxis past crank it up to whatever thrust you need and then back to idle before the aircraft passes.??

The first time I saw the cert engineer doing that I laughed - it was in one of their 747-200s (the one that makes you sleep).

Some easy cryptic clues there as to the airline and which one of their 747-200s they used by the way - the hardcore reg spotters should work it out easy enough.

PaNmAn
 
skymaster
Posts: 227
Joined: Wed Apr 25, 2001 4:59 am

RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 12:03 am

When making engine test on fighters att full poewer and afterburner you lower the hook and connect it to a heavy wire which is firmly attached in concrete. The place is normally surrounded with blast shields. A grid is placed on the intake to secure the ground crew. At least this is the way we do it in Denmark on our F-16´ s.
I will upload a pricture of it.
Skymaster
 
JeffM
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RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 12:47 am

Skymaster,
Back when I used to turn up F-4s and F-14's, I could run both engines up to around 80% with just the brakes depending on the fuel load. You would get some creep over that. To go to full Military (Burner) Chains and the hold back cable were required. Do they make intake screens for airliners? I've never seen one installed.

Jeff
 
G-CIVP
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RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 2:01 am

You don't flog an engine at 100% for long as it increases engine wear.
 
User avatar
Bruce
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RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 3:14 am

"most a/c with the correct amount of fuel will stay put".......What does having a full fuel tank have to do with the plane not moving?
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
G-CIVP
Posts: 1408
Joined: Tue Mar 20, 2001 6:38 am

RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 5:38 am

It is a touch unlikely that an engine run is perfomed with all fuel tanks full as in the photos, providing downwards inertia! If the wheels ain't chocked, its gonna move!!
 
sudden
Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

RE: What Does The Photographer Mean By This...

Fri Nov 15, 2002 11:15 pm

How much fuel you have in the tanks is not vital in these situations.
Set the breaks and throttle up. That does it.
When in doubt, flat out!

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