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Originally posted by weedwhacker
reply to post by tsurfer2000h
Well....let's examine UPS 902 also.
flightaware.com...
Destination was Ontario. You should be aware that Ontario Airport is a mere 37 miles, or so, east of LAX.
This means that around the point where UPS 902 would be crossing the California coastline, it would have already needed to start its normal descent for landing. (This usually occurs just within about 100 mile radius of destination. You can "ballpark" a large jetliner's descent by using the "three-to-one" ratio rule of thumb. In a power-off ---- engines at idle power ---- descent, the airplane will lose about 1,000 feet for every three miles horizontally. SO, from 39,000 feet, for example, [UPS902's cruise altitude] multiply by three. Allow, also, in this descent profile that the airplane will fly PAST the airport, in this case, in order to make a turn back and land to the west, so have to consider the distance travelled over the entire ground track....)
We see that around the west longitude equal to where the LAX Airport sits (118degrees, 25 minutes) UPS 902 was already down, form 39,000 to 29,000 as part of the initial descent.
SO, directly south of LAX, at 29,000 feet...at time 1732-1733 PST. Does that timeline comport with the contrail videotaped by the TV cameraman??
Please take note, also, that BOTH USAir 808 and UPS 902 flew the exact same route, inbound from the Pacific Ocean. They matched exactly up to over Catalina, then the plans diverged, of course, because of the different destinations.
There, a lot of information, for ATS sleuths to examine........
And the UPS plane as you note would have been powering down to some extent. Would that not diminish contrail production?
Originally posted by weedwhacker
reply to post by Human_Alien
Are you not paying attention???
There are TWO candidate large airliner flights, on the SAME route, near the approximate SAME timeframe.
WIll you at least take the time to actually look at the many sources provided, study them intently, instead of just brushing it off, because it doesn't fit your already pre-disposed bias???
Originally posted by weedwhacker
reply to post by backinblack
And the UPS plane as you note would have been powering down to some extent. Would that not diminish contrail production?
Yes, to some extent. Engines pulled back to flight idle would mean a less-prominent contrail. And, yes, the altitudes matter too.
The FlightAware flight log data points and graph can help...as long as you see the same altitude, then airplane is level, and engines up at power to maintain altitude and airspeed. When descending (or climbing) the data is shown, too, in the "Altitude" column, where it says "Rate", with the up/down arrows.
Plot that yourself, if you wish, with the Lat/Long info provided alongside.
Originally posted by Phage
reply to post by backinblack
Yes, and that is a good explanation for the shortening of the contrail seen in the video and the photographs.
08:32PM 33.35 -118.28 98° East 542 624 29,000 -300 Los Angeles Center
08:33PM 33.33 -118.10 99° East 548 631 29,000 Los Angeles Center
08:34PM 33.31 -117.92 99° East 559 643 29,000 -240 Los Angeles Center
08:35PM 33.28 -117.73 99° East 564 649 28,600 -1,560 Los Angeles Center
08:36PM 33.26 -117.55 100° East 559 643 25,900 -2,520 Los Angeles Center
08:37PM 33.23 -117.38 97° East 543 625 23,600 -2,340 Los Angeles Center
And this expert pilot who is very aware of all sorts of stuff up there, was wrong too, right?