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747 Engine Inlet Sparks  
User currently offlinedl757md From United States of America, joined May 2004, 1562 posts, RR: 16
Posted (3 years 7 months 2 days 22 hours ago) and read 2743 times:

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!
4 replies: All unread, jump to last
 
User currently offlinefutureualpilot From United States of America, joined May 2000, 2602 posts, RR: 8
Reply 1, posted (3 years 7 months 2 days 22 hours ago) and read 2734 times:

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.
User currently offlinedl757md From United States of America, joined May 2004, 1562 posts, RR: 16
Reply 2, posted (3 years 7 months 2 days 21 hours ago) and read 2728 times:

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!
User currently offlineEMBQA From United States of America, joined Oct 2003, 9364 posts, RR: 11
Reply 3, posted (3 years 7 months 2 days 18 hours ago) and read 2651 times:

The snow causes it ..............


"It's not the size of the dog in the fight, but the size of the fight in the dog"
User currently offlineboeingfixer From Canada, joined exactly 9 years ago today! , 529 posts, RR: 0
Reply 4, posted (3 years 7 months 2 days 16 hours ago) and read 2591 times:

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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