dl757md
Topic Author
Posts: 1483
Joined: Mon May 24, 2004 9:32 am

747 Engine Inlet Sparks

Tue Dec 28, 2010 6:29 pm

Regarding the following picture

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Photo © Thomas Merkl



I work around engines all the time at night and I'm quite familiar with the phenomenon of static electricity discharging from the fan blades which is more common in the winter due to the lower relative humidity. This picture is the first one I've seen on Anet of the phenomenon (I'm sure there are others) and it struck me as unusual because when I've seen static discharge it's not usually localized at the blade tips as on engines 1,2 and 4 on this Qantas bird. It's usually more dispersed across the disc.
It's possible it could be the tips rubbing the abradable shroud but then why only from the 5 o'clock to 7 o'clock positions? Why is it not doing it on nbr 2 engine? Anyone care to float a theory?

DL757Md
757 Most beautiful airliner in the sky!
 
futureualpilot
Posts: 2404
Joined: Thu May 25, 2000 10:52 am

RE: 747 Engine Inlet Sparks

Tue Dec 28, 2010 6:36 pm

Given the angle at which it appears the sun is illuminating the rest of the airplane I'm thinking its just the way the sunlight is hitting the fan, not actual discharges of electricity.
Life is better when you surf.
 
dl757md
Topic Author
Posts: 1483
Joined: Mon May 24, 2004 9:32 am

RE: 747 Engine Inlet Sparks

Tue Dec 28, 2010 6:51 pm

That would explain why number three has no "sparks" being that it's in the shadow of the fuselage. Thanks!
757 Most beautiful airliner in the sky!
 
EMBQA
Posts: 7798
Joined: Sat Oct 25, 2003 3:52 am

RE: 747 Engine Inlet Sparks

Tue Dec 28, 2010 10:05 pm

The snow causes it ..............
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
boeingfixer
Posts: 573
Joined: Fri Jul 29, 2005 2:02 am

RE: 747 Engine Inlet Sparks

Wed Dec 29, 2010 12:00 am

Quoting EMBQA (Reply 3):
The snow causes it ..............

Not in this case. Everything in shadow is dark indicating that this is just reflected sunlight.

Although snow can cause static electricity discharges on fans it is not as drastic as one would think. During daylight this phenomenon is all but unnoticeable.

Cheers,

John
Cheers, John YYC

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