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-   -   High Speed with Tailwind (https://www.flyertalk.com/forum/travelbuzz/1809587-high-speed-tailwind.html)

milepig Dec 19, 2016 3:19 pm


Originally Posted by YVR Cockroach (Post 27636290)


And sometimes unavoidable. Was in a similar situation on a NW DC-10 from HNL-NRT plodding along at what seemed to be a very leisurely pace. Connection time dwindled so much the NW ground team in NRT had to gather all the pax connecting to BKK in a van as there was only 1/2 hr connecting time left (and the plane parked remotely).

Similar experience on a NW DC-10 MSP-HNL. There was a long period of time where you'd check the time to arrival and then you'd check an hour later and it hadn't moved.

LarryJ Dec 19, 2016 4:15 pm


Originally Posted by milepig (Post 27636276)
I've assumed that the airlines have figured out that they can cut back the speed, save fuel, and still arrive on schedule.

The most efficient way to deal with strong winds is to increase Mach number when flying into a headwind and to decrease Mach when flying with a tailwind.

Of course, there are limits to how fast, or how slow, you can practically go.

eeflyer Dec 19, 2016 5:36 pm

This thread is great! Thanks for the link to the records site. Aviation never ceases to amaze me

YVR Cockroach Dec 19, 2016 5:46 pm

I forgot about another flight. YOW-LHR on a CP 763. Flight was held back at YOW for about 2 hours otherwise arrival would be way before arrival slot time. Can't remember the exact flight time but maybe 5 hours which would have implied an average speed of 660 mph on great circle distance.

fahrradman Dec 19, 2016 6:32 pm

I've seen over 700 mph on CX HKG-JFK several times. Those flights tend not to fly the great circle route, but rather south of Alaska entering the North American land mass close to Vancouver. JFK-HKG tends to be closer to the great circle, going polar and flying across Siberia and the PRC. Love that flight.

milepig Dec 19, 2016 8:30 pm

Mrs. Milepig and I once left NRT at almost the same time. She was flying NRT-ORD and I NRT-LAX before changing to an ORD flight. She caught the tail winds and when I called from LAX as soon as I landed she was already home in our living room.

Fraser Dec 19, 2016 11:05 pm

JFK-LHR in 5hrs 16mins on a BA 772:
http://www.telegraph.co.uk/news/worl...cord-time.html


Originally Posted by FL390 (Post 27632515)
groudspeedrecords.com is always a fun site to browse.

414kts in a Mooney sounds terrifying!
http://www.groundspeedrecords.com/in...yid=2016#12125

eigenvector Dec 19, 2016 11:36 pm

690-700 mph seems fairly common on winter, eastbound flights between SE Asia and Vancouver. HND-YVR in winter is barely longer than a North American transcon.

Nugget_Oz Dec 19, 2016 11:48 pm


Originally Posted by wxguy (Post 27635129)
And then there's the opposite problem.... nearly eight hours BOS-SFO with a 150kt headwind. Yuck.

That's nothing, wait til the 16+ hour TPAC which has already been rerouted because of headwinds requires a fuel stop in Fiji!

Richym99 Dec 20, 2016 1:47 am

750mph ground speed is the best I've experienced, on a 777 IAH to LHR flight with a 200mph tailwind from reaching cruising altitude to the east coast and well above 100mph for much of the crossing. A sub nine hour flight, but like a rollercoaster ride.

Tchiowa Dec 20, 2016 7:12 am


Originally Posted by docbert (Post 27632462)
1,268 kilometres/hour, which is 787 miles/hour on a SQ flight from SIN to SYD many years ago with a ~300km/hour tailwind. The speed was reported by both the inflight system and my GPS (with a 2km/hour difference between the two)

Yes, that's technically faster than the speed of sound, but as it's relative to the air around the plane we weren't actually above the sound limit (obviously!)


Originally Posted by Loren Pechtel (Post 27632498)
I don't remember the tailwind involved but once I tried to ask a FA about it as I thought our ground speed was supersonic and I was curious. Somewhere between her and the pilot there was a communications problem and I never got a proper answer. (TPAC, eastbound.)

I see it regularly TPAC eastbound because there is almost always a tailwind.

mustang281man Dec 21, 2016 2:06 am

Fastest I think I've seen is just over 700mph, HKG-DFW.

slawecki Dec 21, 2016 6:45 am

for every tail, there is a head wind. we once had to stop in iceland to gas up on a muc-iad flight. very cold, and lots of wind. we got dumped on the tarmac in the dark, and were told not to let go of the rope(ran from plane to airport)

bought lots of iclandic wool sweaters

came back recently from lhr to iAd. we dropped south of england, and did not take great circle route. head winds were under 10 knts.

Efrem Dec 21, 2016 8:10 am


Originally Posted by slawecki (Post 27644031)
for every tail, there is a head wind...

While this is true, aircraft aren't on rails like trains. They don't have to follow fixed routes. They often deviate from a great circle route if better winds make up for the added distance, by either catching tailwinds or avoiding headwinds. Airline flight planning departments are very good at optimizing this sort of thing, so the number of flights that are significantly impacted by headwinds is less than the number that are significantly improved by tailwinds.

Fraser Dec 21, 2016 9:03 am


Originally Posted by Efrem (Post 27644326)
While this is true, aircraft aren't on rails like trains. They don't have to follow fixed routes. They often deviate from a great circle route if better winds make up for the added distance, by either catching tailwinds or avoiding headwinds. Airline flight planning departments are very good at optimizing this sort of thing, so the number of flights that are significantly impacted by headwinds is less than the number that are significantly improved by tailwinds.

A few years ago, when I was flying between Washington and London every few months, it was always interesting to see the flightpath, especially for the westbounds back to the US. One particular time we flew almost due north from LHR, similar routing as to when I used to fly between London and LA regularly.

Flightaware shows you the actual distance flown for historical flights and so I looked up our flight and percentage wise it was a good double digits longer than the Great Circle route. One of the days around it the flight was over 5000 miles because of how far north the flight went! Compared to the usual 3677 straight line that's incredible. I think the flying time was about 9hrs 30mins or so...on LHR-IAD!


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