Magic48 From Switzerland, joined Jun 2005, 43 posts, RR: 0 Posted (7 years 9 months 3 weeks 5 days 9 hours ago) and read 15965 times:
Quote: Hokkaido International Airlines, the Sapporo-based carrier known as Air Do, said Tuesday that birds hit one of its Boeing 767 aircraft in midair Monday night, leaving a hole in one of the plane's main wings.
According to the airline, the two-engine jet, which had left Tokyo's Haneda airport, was about to land at Sapporo's New Chitose Airport around 8:45 p.m. when birds collided with its right wing, creating a hole about 30 centimeters wide.
No one was injured in the incident, but it caused Air Do to cancel a total of 15 flights between the two cities, the carrier said.
DLKAPA From , joined Dec 1969, posts, RR:
Reply 9, posted (7 years 9 months 3 weeks 5 days 4 hours ago) and read 15198 times:
Quoting Litz (Reply 3): That's actually eerily similar in size to the big hole the foam caused in Columbia's leading edge ... speed of impact was probably similar as well.
If the speed of impact was the same then Columbia would have never made it out of the atmosphere. Earth's escape velocity = 11.2 km/s, or 1.12 x 10 4 m/s. The speed of a 767 flying at an altitude low enough to hit a bird is probably around 250KIAS, which works out to 0.138 km/s, or 1.38 x 10 2 m/s. Bit of a difference I think.
EMBQA From United States of America, joined Oct 2003, 9362 posts, RR: 12
Reply 10, posted (7 years 9 months 3 weeks 5 days 4 hours ago) and read 15172 times:
Some where on the net is a series of pictures of an American 767 that hit some birds while departing out of LHR I think. One bird went clean through the radome, the pressure bulkhead, through the glareshield and ended up in the Captains lap.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
Prebennorholm From Denmark, joined Mar 2000, 6236 posts, RR: 54
Reply 11, posted (7 years 9 months 3 weeks 5 days 3 hours ago) and read 15082 times:
Quoting DLKAPA (Reply 9): If the speed of impact was the same then Columbia would have never made it out of the atmosphere. Earth's escape velocity = 11.2 km/s, or 1.12 x 10 4 m/s.
Columbia never reached Earth's escape velocity. If it had done that, then it would never have crashed, but entered an eternal orbit around the sun.
It reached Earth low orbit velocity which is some 7.9 km/s.
But the speed when the foam hit the wing was much, much lower. It happened within the atmosphere. Columbia left the atmosphere (for all practical things) going around Mach 3 which is only 0.9 km/s at high altitude.
I don't know at what speed it happened, but it could easily have been at subsonic or low supersonic speed.
But then Columbia was a lot more fragile. Flying it on top of the B747 carrier at just 250 knots though a rain shower would totally destroy the thermal protection.
Always keep your number of landings equal to your number of take-offs, Preben Norholm
Alias1024 From United States of America, joined Oct 2004, 2695 posts, RR: 2
Reply 12, posted (7 years 9 months 3 weeks 5 days 1 hour ago) and read 14743 times:
Quoting Bobster2 (Reply 8): It has to be translation error. They must have meant 30 cm dent, not a hole.
Birds leave holes if they and the aircraft are going fast enough, or the bird hits in a weaker area. I've seen pictures of a Piper Seminole that had a run-in with a large bird (i think it was a turkey vulture) while in flight. The bird entered the top of the wing, and went clear through, leaving about an 24 inch diameter hole on the right wing.
It is a mistake to think you can solve any major problems with just potatoes.
B777fan From United States of America, joined Oct 2004, 154 posts, RR: 2
Reply 15, posted (7 years 9 months 3 weeks 5 days ago) and read 14211 times:
Quoting Prebennorholm (Reply 11): I don't know at what speed it happened, but it could easily have been at subsonic or low supersonic speed.
Not only that, but the foam was moving at the seem speed until it detached.
The relative speed at impact was even lower. I don't recall exactly, but I think the relative impact speed was in the 500 to 600 mph range. I might be low, but that is still fast enough to have caused the damage.
Ckfred From United States of America, joined Apr 2001, 5032 posts, RR: 1
Reply 17, posted (7 years 9 months 3 weeks 4 days 23 hours ago) and read 13678 times:
In 1995, a very severe thunderstorm hit DFW, and a number of AA jets were grounded, due to baseball and even larger hail damaging planes on the ground. A common problem was hail going through composite surfaces on the wings and horizontal stabilizers.
On the other hand, the DC-10s and 727s on the ground only suffered dents, since they had more metal surfaces.
TWAtwaTWA From United States of America, joined May 2006, 141 posts, RR: 0
Reply 19, posted (7 years 9 months 3 weeks 4 days 23 hours ago) and read 13343 times:
This comment relates to the above since it involves birds and planes...
I remember watching a documentary on the development of the B777, and it also featured the design and testing of the giant GE engine. There was a clip of the engine, mounted in test mode, at full power. In order to test the strength of the fanblades and ability of the engine to continue running in adverse situations, many items were chucked into the engine, including ice, small bushes, and even large (dead) birds. It was very entertaining to watch the engines easily consume multitudes of birds, while showcasing their impressive uninterupted function.