248 replies to this topic

[jetblast787]

Donovan., on Jan 18 2009, 01:27 AM, said:

I don't know if this is true, but companies like GE and RR are designing engines to be bird strike - proof. So when the birds fly into the engines, they automatically readjust themselves to let the bird flow through the engine, and adjust again for flying so it can keep going.

how does the engine detect a bird while travelling that fast? by the time the engine realises there is something the bird would have gone and the computer would detect it as a speck of dust  

[Salem]

Iranair747, on Jan 19 2009, 03:36 PM, said:

Donovan., on Jan 18 2009, 01:27 AM, said:

I don't know if this is true, but companies like GE and RR are designing engines to be bird strike - proof. So when the birds fly into the engines, they automatically readjust themselves to let the bird flow through the engine, and adjust again for flying so it can keep going.

how does the engine detect a bird while travelling that fast? by the time the engine realises there is something the bird would have gone and the computer would detect it as a speck of dust  

Some hi-tech sensors that detect objects infront of the engine? because when there's bird strike that affects commercial jets it's usually a big flock of birds and not only one or two birds.

Edited by Salem, 19 January 2009 - 07:37 AM.

[TechnicolorYawn]

[kenair744]

The birds that the pilot saw are probably Canada Goose:





Those birds usually flys in flocks - i have encountered a few of those flocks myself... some of those flocks can be 100+

According to Wiki-

The black head and neck with white "chinstrap" distinguish the Canada Goose from all, except the Barnacle Goose, but the latter has a black breast, and grey, rather than brownish, body plumage.[4] There are seven subspecies of this bird, of varying sizes and plumage details, but all are recognizable as Canada Geese. Some of the smaller races can be hard to distinguish from the newly-separated Cackling Goose.

This species is 76-110 cm (30-43 in) long with a 127-180 cm (50-71 in) wingspan.[5] The male usually weighs 3.2–6.5 kg, (7–14 pounds), and can be very aggressive in defending territory. The female looks virtually identical but is slightly lighter at 2.5–5.5 kg (5.5–12 pounds), generally 10% smaller than its male counterpart, and has a different honk. An exceptionally large male of the race B. c. maxima, the "giant Canada goose" (which rarely exceed 8 kg/18 lb), weighed 10.9 kg (24 pounds) and had a wingspan of 2.24 m (88 inches). This specimen is the largest wild goose ever recorded of any species. The life span in the wild is 10–24 years.[5]

[kenair744]

NASA said that the shuttle has experienced a bird strike upon launch:

http://www.space.com...ird-threat.html

Quote

In 2005, a large turkey vulture collided with the back of the space shuttle Discovery's external tank during NASA's first flight since the 2003 loss of the Columbia orbiter, which was destroyed during re-entry due to heat shield damage incurred during its launch two weeks earlier. The 2005 bird strike incident proved fatal for the turkey vulture, but posed no risk to the shuttle Discovery since it occurred on the side of the external tank that faces away from the attached orbiter.

Edited by kenair744, 19 January 2009 - 11:08 AM.

[TechnicolorYawn]

Salem, on Jan 19 2009, 12:36 PM, said:

Iranair747, on Jan 19 2009, 03:36 PM, said:

Donovan., on Jan 18 2009, 01:27 AM, said:

I don't know if this is true, but companies like GE and RR are designing engines to be bird strike - proof. So when the birds fly into the engines, they automatically readjust themselves to let the bird flow through the engine, and adjust again for flying so it can keep going.

how does the engine detect a bird while travelling that fast? by the time the engine realises there is something the bird would have gone and the computer would detect it as a speck of dust  

Some hi-tech sensors that detect objects infront of the engine? because when there's bird strike that affects commercial jets it's usually a big flock of birds and not only one or two birds.

I imagine you'd be able to get a sensor with a fast enough response time to detect a bit before it hits the fans - especially if you have it on the fuselage near the nose (but that far forwards of the engine, angle of attack would start to come into play..)  - even on the rim of the engine you could probably detect a foreign object before it got to the fans, but you'd have problems getting the mechanical components of the engine (twisting fans?) to respond fast enough to block something moving at 300mph.

[kenair744]

That's the same problem facing air show performers such as Blue Angels / Thunderbirds ; they are going around 600 knots (690 mph) and doing a lot of performance : lots of vertical / horizontal climbing just like that and if there's ever such a sensor in place and a bird just happen to be in the path - no time...

[FL050]

Quote

I don't know if this is true, but companies like GE and RR are designing engines to be bird strike - proof. So when the birds fly into the engines, they automatically readjust themselves to let the bird flow through the engine, and adjust again for flying so it can keep going.

Where people get such information I will never know....

[kenair744]

I saw that on a channel.. maybe History or Discovery - when they were testing engines for Boeing 777; they would thaw frozen turkey and throw it into the spinning engine...

[VFR_Pierre]

kenair744, on Jan 19 2009, 06:30 PM, said:

I saw that on a channel.. maybe History or Discovery - when they were testing engines for Boeing 777; they would thaw frozen turkey and throw it into the spinning engine...

They did that for the new Genx engines, no?

[kenair744]

http://www.cnn.com/2...ref=mpstoryview

Quote

(CNN) -- Two days before US Airways Flight 1549 crashed into the Hudson River, passengers on the same route and same aircraft say they heard a series of loud bangs and the flight crew told them they could have to make an emergency landing, CNN has learned.

[FL050]

kenair744, on Jan 19 2009, 07:30 PM, said:

I saw that on a channel.. maybe History or Discovery - when they were testing engines for Boeing 777; they would thaw frozen turkey and throw it into the spinning engine...

Every turbine engine on any commercial aircraft goes through that testing.  To be certified into service, the engines have to be able to ingest birds, and other FOD, and be able to continue running above a certain N1%; plus many other factors and tests.

[TechnicolorYawn]

Yes, they've been firing chickens and other birds into engines to test them for years.

haha, what a job

Edited by TechnicolorYawn, 20 January 2009 - 08:44 AM.

[vhqpa]

TechnicolorYawn, on Jan 20 2009, 12:11 AM, said:

LMAO thanks for that, made my day

Edited by vhqpa, 20 January 2009 - 08:52 AM.

[Flying_Pie]

they released the CVR recordings

WiCITstsdX8

[Cactus]

Ken, you're not blaming Canadian geese for this one




One more:

[_NW_]

Flying_Pie, on Jan 23 2009, 07:58 PM, said:

they released the CVR recordings

CVR is cockpit voice recorder..  not a PA recorder.  So fake, it's not even funny.

[spitfir3]

NWilkinson, on Jan 23 2009, 11:51 PM, said:

Flying_Pie, on Jan 23 2009, 07:58 PM, said:

they released the CVR recordings

CVR is cockpit voice recorder..  not a PA recorder.  So fake, it's not even funny.

It'd still record a PA announcement if it records all conversation etc in the cockpit..?

[_NW_]

Probably....   but that's not the point.  The one put on youtube is a fake.

[kenair744]

Got that from my cousin: