Flyabunch From United States of America, joined Nov 2004, 517 posts, RR: 4 Posted (8 years 3 months 4 days 12 hours ago) and read 3504 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?
Flyabunch From United States of America, joined Nov 2004, 517 posts, RR: 4
Reply 3, posted (8 years 3 months 4 days 7 hours ago) and read 3401 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.
Lightsaber From United States of America, joined Jan 2005, 12304 posts, RR: 100
Reply 4, posted (8 years 3 months 3 days 2 hours ago) and read 3201 times:
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!
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.