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 Still-air Range SFO/LAX-SIN
 Zvezda From Lithuania, joined Aug 2004, 10512 posts, RR: 63Posted Sat Jan 21 2006 23:00:08 UTC (10 years 4 months 1 week 1 day 17 hours ago) and read 5001 times:

 What still-air range would an airliner need to fly westbound SFO-SIN and LAX-SIN year-round without a technical stop?
 PhilSquares From , joined Dec 1969, posts, RR: Reply 1, posted Sun Jan 22 2006 01:13:30 UTC (10 years 4 months 1 week 1 day 15 hours ago) and read 4955 times:

 KSFO-WSSS 7340NM (NO WIND) KLAX-WSSS 7621NM (NO WIND) The wind factor will vary considerably. This time of year you are most likely looking at a -70Knot factor the entire route, while in the summer it might be as low as -30Knots.
 Zvezda From Lithuania, joined Aug 2004, 10512 posts, RR: 63 Reply 2, posted Sun Jan 22 2006 18:48:43 UTC (10 years 4 months 1 week 21 hours ago) and read 4843 times:

 A 70 knot headwind along the entire route would add about 1000nm to the still-air distance, right? So, an airliner would need a still-air range of more than 8500nm to fly LAX-SIN nonstop in the winter, right?
 BAW716 From United States of America, joined Nov 2003, 2051 posts, RR: 26 Reply 3, posted Sun Jan 22 2006 23:02:28 UTC (10 years 4 months 1 week 17 hours ago) and read 4794 times:

 Divide great circle distance by average speed (M0.84 at FL390 is about 490kts), so 7340/490=14.97hrs. Add 70kt headwind brings ground speed to 420kts. 7340/420=17.48hrs. Take the still air ground speed and multiply times the endurance based on wind and you get the adjusted distance: 490 x 17.48hrs = 8565nm. You pretty much hit it on the nose. baw716
 David L. Lamb, fmr Area Mgr Alitalia SFO 1998-2002, fmr Regional Analyst SFO-UAL 1992-1998
 Zvezda From Lithuania, joined Aug 2004, 10512 posts, RR: 63 Reply 4, posted Mon Jan 23 2006 01:02:20 UTC (10 years 4 months 1 week 15 hours ago) and read 4773 times:

 Thanks baw716. So, we have equivalent still-air distances of 8565nm for SFO-SIN and 8891nm for LAX-SIN by the same methodology. It seems like LAX-SIN is nearly as challenging as EWR-SIN.
 BAW716 From United States of America, joined Nov 2003, 2051 posts, RR: 26 Reply 5, posted Mon Jan 23 2006 12:03:06 UTC (10 years 4 months 1 week 4 hours ago) and read 4692 times:

 David L. Lamb, fmr Area Mgr Alitalia SFO 1998-2002, fmr Regional Analyst SFO-UAL 1992-1998
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