NZFF

by **omitchell** » Tue Jan 13, 2015 6:24 pm

https://nz.totaltravel.yahoo.com/news/a ... ic-speeds/

by **Ian Warren** » Tue Jan 13, 2015 6:57 pm

Surprising how quick the 777 can go but that I guess beats the record, one I do is track my flights when flying and think the fastest we ever got to was just under 1000Kph - 982

by **Charl** » Wed Jan 14, 2015 9:46 am

Well... rubbish.
It may certainly be that the wind was a little stronger than usual, but the Machmeter would have been reading what it always does.
The aircraft doesn't know it's being shoved along, any more than it knows it's doing 100,000km/h around the sun.

On the Indian Ocean B747 runs, you regularly see 1150km/h+ ground speed going W-E, maybe the jetstream is a little huffier downunder.

https://www.windyty.com/?surface,clouds ... ,-28.037,4

by **Ian Warren** » Wed Jan 14, 2015 10:15 am

Charl wrote:
QUOTE (Charl @ Jan 14 2015,10:46 AM) <{POST_SNAPBACK}>
On the Indian Ocean B747 runs, you regularly see 1150km/h+ ground speed going W-E, maybe the jetstream is a little huffier downunder.

There you go 1150kph , breaks the sound barrier and that record almost , its the same with the Tasman flight , one return flight 2 hours and hour flight heading to Sydney 2 hour 45 mins.

Something for the media to write about I guess .

by **Charl** » Wed Jan 14, 2015 12:00 pm

No it doesn't break the sound barrier...

QUOTE

Not since the Aerospatiale-BAC Concorde â€” capable of cruising at twice the speed of sound â€” has any commercial airliner been able to sustain supersonic performance, and according to retired Boeing 777 and Airbus captain and current airline flight instructor Lim Khoy Hing, it's not possible.

In a blog post from 2011, one curious flyer asked whether supersonic speeds had been reached on a flight to London onboard a 777.

Captain Lim explained:

"Even if there is a strong tail wind pushing the plane forward and the ground speed may have exceeded the theoretical speed of sound, in reality, the plane has not gone supersonic.

"The confusion arises between the understanding of ground speed and the plane's speed. The ground speed is the speed at which an object travels relative to a fixed point on the Earth's surface. The difference between ground speed and airspeed is caused by the influence of winds on the overall speed of the aircraft.

"This is analogous to you walking at 2 kmh along a [moving sidewalk] that is moving at 2 kmh. Your actual movement towards your plane at the gate is pretty fast at 4 kmh (2 + 2) but as far as you are concerned, you are still walking at 2 kmh!"

So there you go. Even if your flight is fortunate enough to have a helpful push from the jet stream, it's not about to go near supersonic speeds in level flight.[/quote]

NZFF

Jetstream pushes flight near supersonic speeds

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