Positive rate From Australia, joined Sep 2001, 2143 posts, RR: 1 Posted (11 years 2 months 3 days 4 hours ago) and read 1821 times:
Watching the Discovery channel last night i saw this interesting documentary about Alien life and our origins here on Earth. There was a 747 in United livery- a -100 or -200 that NASA will will fitting an enormous telescope to. The telescope will be fitted right at the back of the plane, and the fuselage will have a panel that can be opened so that observations can be made. The telescope is so big that just the reflecting mirror weighs about 20 tonnes. Air craft motion and turbulence will not be a problem as the telescope will allow for it. This will be a relatively cheap method to observe deep space free from clouds and the 747 is the perfect plane for the job Oh yeah it will be respainted in NASA livery.
B747skipper From , joined Dec 1969, posts, RR:
Reply 5, posted (11 years 2 months 2 days 17 hours ago) and read 1676 times:
This aircraft (747SP-21) is certificated for operations up to 45,100 feet - in airline operations - like ANY OTHER 747... but because of its lighter weight, it is capable of reaching FL 450 faster than heavier 747s...
One thing - the aircraft will be operated by NASA probably, under restricted (non standard airworthiness) category because of its modifications, and thereby will NOT BE legally restricted to 45,000 feet...
The E-4 (military version of 747) can be flown to approximately 50,000 feet, or even higher when necessary, so I am sure a 747SP could do even better, after all has the same wing, therefore same buffet speed limits...
I flew that plane when it was with PanAm, glad it got a nicer retirement than a desert aircraft cemetery...
Sunilgupta From United States of America, joined Nov 2000, 775 posts, RR: 14
Reply 7, posted (11 years 2 months 2 days 16 hours ago) and read 1646 times:
I flew on N145UA on its last scheduled passenger service which also happened to be the last scheduled passenger service for an SP in the US! The flight was IAD-SFO but I can't remember the flight number.
N145UA was the only SP ever placed in the new United colors.
B747Skipper From , joined Dec 1969, posts, RR:
Reply 8, posted (11 years 2 months 2 days 15 hours ago) and read 1639 times:
Most of them were based West Coast with PanAm, I was based JFK and MIA so did not fly them much at all, the SP was nice to handle for max altitude capability, but not as pleasant (shall I say "stable") as the 100/200 -
We had a run non-stop JFK-BAH which I flew occasionally, by chance we had extra pilots, because the flight was about 14 hours long... Now with Argentina, flew extra long range with our 747-287 with 10 tanks (7Q engines), they are, as far as range, as good as the SP were. We had a SP in Argentina (ex BNF) but actually our 200s could nearly handle same flights with better payload. So they got rid of the SP hand flew the SP routes with... 200s...
Aloges From Germany, joined Jan 2006, 8685 posts, RR: 43
Reply 11, posted (11 years 2 months 2 days 7 hours ago) and read 1516 times:
An interesting project, especially since there's a lot of information in German available! By the way, does anyone know if they're really going to expose the entire telescope bay to the air in flight? I still wonder if the device and the airframe could withstand the turbulences/wake. On the other hand, what could they put there? Glass would be too delicate and probably to heavy... Any ideas?
Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
Positive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 12, posted (11 years 2 months 2 days 3 hours ago) and read 1481 times:
>>>>>>>By the way, does anyone know if they're really going to expose the entire telescope bay to the air in flight? I still wonder if the device and the airframe could withstand the turbulences/wake. On the other hand, what could they put there? Glass would be too delicate and probably to heavy... Any ideas?
I was thinking the exact same thing. I highly doubt the telescope will be directly exposed to the slipstream, that would be impossible at 500MPH and 45,000+ feet. More than likely it will be some kind of silicate compound or special glass.