Aces High Bulletin Board
General Forums => The O' Club => Topic started by: Skuzzy on February 20, 2019, 09:44:57 AM
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Thought some of might get a kick out of this.
https://www.latimes.com/science/la-sci-sn-jet-stream-flight-20190219-story.html
What a tail wind!
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Going the other direction would be like the slow boat to China.
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I had read that this morning. Quite a cruise speed.
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Had a chopper fly by fast and low over the house last night. Didn't sound like one of the usual suspects so I brought up flightradar24 to see what it was. Turned out to be a medevac heading towards Baltimore. Saw a large airliner icon passing north of me so I checked it out. Was an A380 going from LAX to Paris at 37k....and 700 or so mph. So I kinda figured that was what was going on! Don't imagine any of the passengers get a fuel discount on that?hehe
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Going the other direction would be like the slow boat to China.
I would hope the flight plan would route the plane away from the jet stream, in that case. Hehe,..but it would be funny to watch.
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So it was supersonic. Would it create a sonic boom? Or is a sonic boom dependent on air speed not ground speed?
Wiley.
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So it was supersonic. Would it create a sonic boom? Or is a sonic boom dependent on air speed not ground speed?
Wiley.
The plane was not supersonic airspeed. It had a very strong tail wind. The high speed given was ground speed, roughly plane airspeed plus tail wind speed.The airliner in question is not capable of supersonic flight.
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The plane was not supersonic airspeed. It had a very strong tail wind. The high speed given was ground speed, roughly plane airspeed plus tail wind speed.The airliner in question is not capable of supersonic flight.
So it's dependent on airspeed then. Ok.
Wiley.
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Yeah I think of that thing went supersonic there'd be a boom! Just another kind of boom!
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I would hope the flight plan would route the plane away from the jet stream, in that case. Hehe,..but it would be funny to watch.
Sometimes, that isn’t feasible but, the dispatchers do try and work around it. Many times, Mother Nature is in a bad mood and not very cooperative.
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That's true. Momma nature can be a biotch at times.
That jolt, when they entered the stream had to be a bit harrowing.
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Sometimes there’s a jolt of turbulence. Other times, the ground speed indicator just starts increasing to abnormally high speed and it’s nice and smooth.
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Any chance of losing lift when entering a tail wind stream moving at that velocity? Or is the approach to it such that the tail wind increases slow enough to allow the plane time to accelerate into it?
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Any chance of losing lift when entering a tail wind stream moving at that velocity? Or is the approach to it such that the tail wind increases slow enough to allow the plane time to accelerate into it?
At that alt I imagine the craft is moving at cruise. That speed minus the tail wind would have to be below stall.
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Any chance of losing lift when entering a tail wind stream moving at that velocity? Or is the approach to it such that the tail wind increases slow enough to allow the plane time to accelerate into it?
Never heard of wind shear in the flight levels.
Suppose it's possible.
- oldman
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Never heard of wind shear in the flight levels.
Suppose it's possible.
- oldman
No he means loss of relative airspeed due to the tail wind. Shear literally means transverse, as in a vertical wind.
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No he means loss of relative airspeed due to the tail wind. Shear literally means transverse, as in a vertical wind.
https://www.aopa.org/news-and-media/all-news/2002/july/flight-training-magazine/wind-shear-max-power
You shouldn't lose air speed (not ground speed) by moving into a different air mass, absent wind shear.
- oldman
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Any chance of losing lift when entering a tail wind stream moving at that velocity? Or is the approach to it such that the tail wind increases slow enough to allow the plane time to accelerate into it?
No Skuzzy. The wind change is never rapid enough or dramatic enough to affect the airplane in that way. But, as Puma mentioned, sometimes transitioning to the core of the Jetstream is smooth as glass and other times, the turbulence can be "biblical".
You guys should know that when airline pilots see a "cool" groundspeed number like that, they smile but it isn't really all that exciting. Everyone of them just wants to do their 80 to 85 hours for the month and go home. And when you're on the last leg home, no speed is fast enough.
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https://www.aopa.org/news-and-media/all-news/2002/july/flight-training-magazine/wind-shear-max-power
You shouldn't lose air speed (not ground speed) by moving into a different air mass, absent wind shear.
- oldman
It depends on the rate of change. You most definitely CAN lose airspeed when transitioning from one air mass to another.
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No Skuzzy. The wind change is never rapid enough or dramatic enough to affect the airplane in that way. But, as Puma mentioned, sometimes transitioning to the core of the Jetstream is smooth as glass and other times, the turbulence can be "biblical".
You guys should know that when airline pilots see a "cool" groundspeed number like that, they smile but it isn't really all that exciting. Everyone of them just wants to do their 80 to 85 hours for the month and go home. And when you're on the last leg home, no speed is fast enough.
But the one thing we can’t stand is seeing that wind on the nose... Makes me want to reach for a pen and stab myself in the eye. :bhead
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One thing for sure, supersonic level ground speed is beyond way cool! :aok
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One thing for sure, supersonic level ground speed is beyond way cool! :aok
:cheers:
I topped 750 once. That was a bookmark moment.
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No Skuzzy. The wind change is never rapid enough or dramatic enough to affect the airplane in that way. But, as Puma mentioned, sometimes transitioning to the core of the Jetstream is smooth as glass and other times, the turbulence can be "biblical".
You guys should know that when airline pilots see a "cool" groundspeed number like that, they smile but it isn't really all that exciting. Everyone of them just wants to do their 80 to 85 hours for the month and go home. And when you're on the last leg home, no speed is fast enough.
Any chance of losing lift when entering a tail wind stream moving at that velocity? Or is the approach to it such that the tail wind increases slow enough to allow the plane time to accelerate into it?
As Busher said, it’s typically smooth or Biblical. Gain or loss of speed is pretty much an insignificant concern in the big scheme of things. Now, that last leg home, like he said, is the most important one of the trip. “Direct” and “Best forward speed” are the two most sought out favorite calls from ATC on that last leg.
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We have a jet stream that flows from Australia to NZ and is very consistent. It will frequently drop a 4 hour flight down to 3 hours.
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LOL strayans....
(https://uploads.tapatalk-cdn.com/20190221/2072f37ae95d014c004572c162364288.jpg)
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You used to be able to simulate these effects in game. We used to use it in KOTH for our alt cap. Very interesting first time you fly into one.