Re: [Fwd: Jetstream]

[T Berk <tberk@mindspring.com>]

Good stuff-

Q. Did the plane have a cat. or not?

TBerk

Kevin Collins wrote:
> 
> Here's a response on the jetsream thread that was kicking around, from
> a good buddy of mine who flies the Airbus A300 for American....
> 
> -------- Original Message --------
> Subject: Jetstream
> Date: Mon, 08 Feb 99 17:37:48 GMT
> From: dreck@shadow.net (Dave Reck)
> To: Kevinc@flashcom.net (Kevin Collins)
> 
> Kev - I've seen the Jetstream at 225Knots ( 255 mph ). The airspeed
> indicators in aircraft become less accurate with altitude. We switch
> over to Mach speed at about 28,000 ft. Most comm. planes fly at
> around .80 or 80% of the speed of sound. Of course the speed of sound
> also changes with altitude because the air is colder. At 39,000 ft. the
> average comm. jet will show an indicated airspeed of around 260
> knots due to the low air density. For all practical purposes - the
> airspeed indicator is worthless until descending to a lower altitude.
> What we care about is the True A/S plus the wind which gives us
> Ground Speed. We flew a DC-10 from LAX-JFK one night and had a
> G/S over 630 Knots ( over 700 mph ) We did the trip in 4 hrs. dave
> 
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