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Smoky 717's On Take-off  
User currently offlineFlyabunch From United States of America, joined Nov 2004, 517 posts, RR: 4
Posted (8 years 7 months 3 weeks 21 hours ago) and read 3658 times:

I did a search to see if I could find anything on this topic and didn't come up with anything.

Anyway, this morning I was at LAS waiting to fly to Denver. I was watching take-offs and noticed that two Air Tran 717's in a row left quite a smoke trail. It reminded me of the old days with the 707's and DC-8's. I watched all the other types that took off after that, including an old 732 and none had any noticible smoke. Only the near new 717's.

Is there something specific in that RR/BMW engine that might cause this result?

Mike

7 replies: All unread, jump to last
 
User currently offlineSeptember11 From United States of America, joined May 2004, 3623 posts, RR: 21
Reply 1, posted (8 years 7 months 3 weeks 19 hours ago) and read 3602 times:

Ummm ... it could be the freezing & cold morning "smoke" (first flight of the day)?


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User currently offlineAirPortugal310 From Palau, joined Apr 2004, 3574 posts, RR: 2
Reply 2, posted (8 years 7 months 3 weeks 17 hours ago) and read 3569 times:

Whether you actually see it or not, its there on all airplanes...

Ive seen them on everything from a CRJ to a 777....airplane pollution is a way of life....for now.



I sell airplanes and airplane accessories
User currently offlineFlyabunch From United States of America, joined Nov 2004, 517 posts, RR: 4
Reply 3, posted (8 years 7 months 3 weeks 16 hours ago) and read 3555 times:

What I saw was definitely black soot on climb out, not the cold start stuff. It was only "visible" on the two 717's. I was in the terminal, looking west with the sun behind me so if there was smoke, it was easy to see. The only other jet that looked like there might be some trace of smoke was a WN 737-700. Even the 732 was clean by comparison.

Mike


User currently offlineLightsaber From United States of America, joined Jan 2005, 12868 posts, RR: 100
Reply 4, posted (8 years 7 months 2 weeks 6 days 11 hours ago) and read 3355 times:
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Quoting Flyabunch (Thread starter):
Is there something specific in that RR/BMW engine that might cause this result?

Yep, the Talon (old Pratt) style fuel injectors!  duck 

Actually, I'm serious. This style of fuel injectors is pretty smoky. I can even tell you the old mentor of mine who almost got sued for transferring the technology to BMW. Recall, all smoke is created in the combustor.

Lightsaber



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User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 5, posted (8 years 7 months 2 weeks 6 days 11 hours ago) and read 3351 times:

Quoting September11 (Reply 1):
Ummm ... it could be the freezing & cold morning "smoke" (first flight of the day)?

Unlikely as it was seen on T/O.More so to do with the Combustion.Probably Fuel Injectors.
BTW what type Combustion chamber is used on the B717.
regds
MEL



Think of the brighter side!
User currently offlineLiedetectors From United States of America, joined Jul 2005, 360 posts, RR: 0
Reply 6, posted (8 years 7 months 1 week 6 days 21 hours ago) and read 3118 times:

A quote from the Rolls-Royce book "The Jet Engine" :

"Environmental impact is an undesirable by-product of the gas turbine. Performance is its prime function."



If it was said by us, then it must be true.
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 7, posted (8 years 7 months 1 week 6 days 17 hours ago) and read 3068 times:

Quoting Liedetectors (Reply 6):
Environmental impact is an undesirable by-product of the gas turbine. Performance is its prime function."

True.But excess & extra qty of the former could lead to other complications in the long run  Smile
regds
MEL



Think of the brighter side!
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