A380Heavy From United Kingdom, joined Mar 2006, 280 posts, RR: 0
Reply 8, posted (10 years 3 weeks 3 days 20 hours ago) and read 3405 times:
Unlike BHXDTW was fortunate enough to be at NEMA to see the An-225 go out - I was right at the end of the runway when the giant came towards me with just over 100 tonnes of gifts for under priveledged children on board.
The An-225 was no more than 50ft above my head - the sight was awesome, the whole sky filled with aeroplane - and the noise!!!
I only live 10 minutes away from NEMA and I must have gone to see this aircraft half a dozen times. It doesn't matter how often you see it, you still can't believe it! We have An-124's in all the time from Polet, Antonov and Volga Dnepr but they pale into insignificance in comparisom.
Texfly101 From United States of America, joined Jan 2006, 351 posts, RR: 0
Reply 14, posted (10 years 3 weeks 3 days 19 hours ago) and read 3299 times:
Due to the weight of the materials in the wing, all wings will droop a designed amount. Thats just the characteristic of the spar material as characterized by stress and strain coefficients. Consequently, when lift is applied (the opposite of gravity), the wings will bend upwards. A properly designed wing of a large airplane will droop noticeably, as to keep it not noticeable would require a lot more material in the spars which is added weight. Make the material just enough for the design loads (think the 1.5 factor that has been discussed on the A380 test) and you get a functional wing that is just heavy enough to function properly but not too heavy that it eats up weight allotment for passenger and cargo. The wing of the B-47 and B-52 has amazing amounts of flex, over 15 feet. In a high stress environment, updrafts and downdrafts, the wings almost look like they're flapping like a bird....very cool.
2H4 From United States of America, joined Oct 2004, 8957 posts, RR: 56
Reply 20, posted (10 years 3 weeks 2 days 23 hours ago) and read 2600 times:
Quoting StudentFlyer (Reply 4): What was the Vr and V2? I think that was slow... or was it just due to the size that it looked slow?
The percieved speed is an optical illusion that has to do with the time it takes the aircraft to travel a distance equal to it's own length. Generally, the longer the aircraft, the slower it seems to travel.
That's why aircraft like 747s and AN-225s seem to progress through the air slowly, while short/small aircraft like the BD-5J seem to be travelling at 400 kts when in fact they're flying about half that speed.