Trex8 From United States, joined Nov 2002, 2615 posts, RR: 10 Posted (1 year 8 months 5 days 20 hours ago) and read 3399 times:
just got off a UA 744 flight HKG-ORD yesterday, the "map display" thingy showed us going 750mph ground speed (at FL32) just east of Japan. I have never seen a figure this high on numerous traspac flights, high 600s, just over 700 seems not uncommon. Tailwinds I know can be quite high in that area and this isn't airspeed but is this close to a record?? I assume these map displays which show position etc are pretty accurate, it seemed to be indicating "normally" the rest of the flight.
Apparently, the current record there for a 744 is 731kts, which is about 822 miles per hour (1,316 km/h). The highest speed I recall from being on a 744 was a QF flight where we were doing about 1,150 km/h ( 718 mph / 639kts)
Regards, JetMech
[Edited 2007-05-09 11:17:43]
The universe revolves around engineers as we choose the co-ordinate system!
Futurecaptain From , joined Dec 1969, posts, RR: Reply 4, posted (1 year 8 months 3 days 13 hours ago) and read 2917 times:
I though I remembered a member here who had a picture of his plane doing over 1200 kts ground speed?? Don't remember what topic the pic was posted in though.
David L From United Kingdom, joined May 1999, 7432 posts, RR: 28 Reply 5, posted (1 year 8 months 3 days 12 hours ago) and read 2902 times:
Quoting Futurecaptain (Reply 4): I though I remembered a member here who had a picture of his plane doing over 1200 kts ground speed?? Don't remember what topic the pic was posted in though.
I can think of one member here who saw his aircraft do that almost every time. I don't remember him posting a picture of it though.
Mr.BA From Singapore, joined Sep 2000, 3423 posts, RR: 17 Reply 11, posted (1 year 7 months 4 weeks 1 day 3 hours ago) and read 2465 times:
Think it could be a good idea to have the lowest speed recorded in cruise as well! Imagine going against the jetstream of 200 knots. Would give your GS to be just around 280!
ThirtyEcho From United States, joined Dec 2001, 1083 posts, RR: 1 Reply 13, posted (1 year 7 months 3 weeks 6 days 22 hours ago) and read 2230 times:
Bless you for not confusing groundspeed with airspeed and claiming to be the Chuck Yeager of 744 passengers.
MANY years ago, I was on an AA B707 from LAX to DFW and the Captain reported that we were clocking a groundspeed of 740mph. We arrived over an hour ahead of schedule.
My former instrument instructor had a rather "canine" expression for moving along like that. WWII pilots will know the correct phraseology.
Blackbird From United States, joined Oct 1999, 3436 posts, RR: 5 Reply 14, posted (1 year 7 months 3 weeks 4 days 10 hours ago) and read 1874 times:
I just looked at that "record" site.
It only counts if it was RECORDED by a camera. Which means these speeds almost certainly have been either tied exceeded before, if not on many times. 411A's 728-kt run over FUK-NRK during 1992 would be an example.
BoeingOnFinal From Norway, joined Apr 2006, 476 posts, RR: 0 Reply 16, posted (1 year 7 months 3 weeks 11 hours ago) and read 1540 times:
Quoting Mr.BA (Reply 11): Think it could be a good idea to have the lowest speed recorded in cruise as well! Imagine going against the jetstream of 200 knots. Would give your GS to be just around 280!
Then it would be a good idea to change your altitude, if possible
Flyf15 From United States, joined May 1999, 6101 posts, RR: 15 Reply 17, posted (1 year 7 months 2 weeks 6 days 14 hours ago) and read 1444 times:
Quoting Mr.BA (Reply 11): Think it could be a good idea to have the lowest speed recorded in cruise as well! Imagine going against the jetstream of 200 knots. Would give your GS to be just around 280!
In cruise in the CRJ I've seen groundspeeds as low as about 275kts with normal TAS. Headwind of around 175kts right on the nose... going the other direction, or ground speed was over 600kts.
Nbseer From United States, joined Apr 2004, 48 posts, RR: 0 Reply 18, posted (1 year 7 months 2 weeks 5 days 14 hours ago) and read 1276 times:
This might be a dumb question, but at what point do you break the sound barrier, get a sonic boom, etc? If your ground speed is faster than sound, but only because of an extreme tailwind, what's up?
Arrow From Canada, joined Jun 2002, 1878 posts, RR: 1 Reply 19, posted (1 year 7 months 2 weeks 5 days 13 hours ago) and read 1272 times:
Quoting Nbseer (Reply 18): This might be a dumb question, but at what point do you break the sound barrier, get a sonic boom, etc? If your ground speed is faster than sound, but only because of an extreme tailwind, what's up?
I'm no expert, but I thought breaking the sound barrier was related to air speed, not ground speed -- and it's the air speed that creates the sonic boom. I still have fond memories of flying my Luscombe 8A into a very stiff headwind, and watching the freeway traffic below blow my doors off. Fortunately, I wasn't going very far.
Never let the facts get in the way of a good story.
David L From United Kingdom, joined May 1999, 7432 posts, RR: 28 Reply 20, posted (1 year 7 months 2 weeks 5 days 11 hours ago) and read 1233 times:
Quoting Arrow (Reply 19): I'm no expert, but I thought breaking the sound barrier was related to air speed, not ground speed -- and it's the air speed that creates the sonic boom.
Correct. If you have a 200 kt tailwind, so does sound, since it's also travelling through the air. You only break the sound barrier if you move faster through the air than sound travels through the same air.
Starlionblue From Greenland, joined Feb 2004, 13036 posts, RR: 57 Reply 21, posted (1 year 7 months 2 weeks 5 days 9 hours ago) and read 1208 times:
Quoting Nbseer (Reply 18): This might be a dumb question, but at what point do you break the sound barrier, get a sonic boom, etc? If your ground speed is faster than sound, but only because of an extreme tailwind, what's up?
Not a dumb question. Most people don't get this. And you asked it in a nice way. We like that here in Tech/Ops.
My real self is a Blood Elf Mage in Azeroth. Meet him on Boulderfist.
RedFlyer From United States, joined Feb 2005, 3200 posts, RR: 20 Reply 22, posted (1 year 7 months 2 weeks 4 days 9 hours ago) and read 1106 times:
Quoting Futurecaptain (Reply 4): I though I remembered a member here who had a picture of his plane doing over 1200 kts ground speed?? Don't remember what topic the pic was posted in though.
Sponsor Message: 
From United States, joined Nov 2002, 2615 posts, 
From Australia, joined Mar 2006, 1958 posts, 
. You may be interested in this website;
From Hong Kong SAR, PRC, joined Jul 2005, 1585 posts, 
From , joined Dec 1969, posts, 
From United Kingdom, joined May 1999, 7432 posts, 
From Greenland, joined Feb 2004, 13036 posts, 
From Singapore, joined Sep 2000, 3423 posts, 
From Iraq, joined Aug 2006, 3308 posts, 
From Norway, joined Apr 2006, 476 posts, 
From Canada, joined Jun 2002, 1878 posts,