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11/4/2010 2:03:18 AM
59
Are stealth planes loud?
Today an F22 was flying low over my house and it was probably the loudest thing I've ever heard, but marvelous nonetheless. I was wondering as I gazed upon that elegant piece of machinery if stealth planes were as loud. Surely a plane made to be stealthy wouldn't be so darn loud@ yet they use similar technology. Can someone enlighten me?
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[quote][b]Posted by:[/b] rugby_rox F22 =/= stealth plane. B2 Spirits and F117A's are quiet as hell. You can see them during the day, but you will not hear them. At all. The engine's are baffled and are insanely quiet. However, an easy way that renders stealth useless is laser radar, a concept that as far as the public is concerned is only a concept. Not sure if it's actually in use yet or not for the military. However if it is it can work much, much better than conventional radar because it uses light rather than radio waves. Because the skin of stealth bombers allow radio waves to simply slide off, making it seem like the object is not there, light is not as easy to fool as it will pick up on something being there. [/quote]that wouldnt, partly because the plane would have to be incredibly close to the laser to stop the atmosphere from interfering with the distance estimates and all stealth based aircraft are painted a matte color that doesn't reflect light, to even get a response the plane would have to be either reflective or the laser would have to be extremely strong, and making a strong laser capable of traveling 20+ miles without distortion takes so much power that it would have to have its own power plant to function on its own for very long. also how is the cross section the size of a hummingbird not stealthy...? and how does one 'baffle' a jet engine after all the exhaust is whats moving it forward, you can't very well silence it without slowing the aircraft, and the amount of power it takes to push a multi ton aircraft makes that engine pretty loud. its all in engine placement which is why the F-117's engines are located above the wings so the sound can't hit the ground without going through the wings. [Edited on 11.03.2010 7:00 PM PDT]
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30,000+ feet of atmosphere can make sound a little quiter...
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[quote][b]Posted by:[/b] family chief [quote][b]Posted by:[/b] ME7ALMAR7IAN777 [quote][b]Posted by:[/b] mount420 I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?[/quote] An F22 has a very distinct outline. It would be difficult to confuse it with anything else.[/quote]F-15? Granted both look nothing like each other in general apperance but if you saw it from a view under the aircraft it would be hard to tell the difference. We're talking about an aircraft which will easily reach 500 MPH when flying at attitudes, it's like watching a NASCAR race but the cars are five times faster and you trying to Identife said car in the race. What town / city do you live in, you can track down units with F-22's by their HQ base location. See if there's a air force base near you, find out the name, go to Wikipedia, look up F-22 Raptor, and under units look each one up and see if their HQ is at the base near your area.[/quote] Raleigh, NC. Nearest base is Seymour-Johnson AFB, in Goldsboro, about an hour away. Home of the 4th Fighter Wing. They primarily use the F15 Strike Eagle, but F22s occasionally show up for demonstration purposes, such as air shows or AFROTC base visits. Also, at low altitude, aircraft are restricted to flying at low speed, which makes identifying them easier.
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[quote][b]Posted by:[/b] rugby_rox light rather than radio waves[/quote] lolwat
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[quote][b]Posted by:[/b] rugby_rox F22 =/= stealth plane. B2 Spirits and F117A's are quiet as hell. You can see them during the day, but you will not hear them. At all. The engine's are baffled and are insanely quiet. However, an easy way that renders stealth useless is laser radar, a concept that as far as the public is concerned is only a concept. Not sure if it's actually in use yet or not for the military. However if it is it can work much, much better than conventional radar because it uses light rather than radio waves. Because the skin of stealth bombers allow radio waves to simply slide off, making it seem like the object is not there, light is not as easy to fool as it will pick up on something being there. [/quote]I saw a B2 at an airshow and it was really loud, but it was also flying super low. I'm terrible at estimates, but it was close.
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[quote][b]Posted by:[/b] family chief F-15? Granted both look nothing like each other in general apperance but if you saw it from a view under the aircraft it would be hard to tell the difference.[/quote] [url=http://farm4.static.flickr.com/3168/2808115565_465718def3.jpg]The difference is[/url] [url=http://www.ausairpower.net/000-F-15E-Profile-MKopp.jpg]pretty obvious to me.[/url] But I'm a stickler for details.
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A stealth plane means that it can't be seen on radar, not that it makes no sound.
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F22 =/= stealth plane. B2 Spirits and F117A's are quiet as hell. You can see them during the day, but you will not hear them. At all. The engine's are baffled and are insanely quiet. However, an easy way that renders stealth useless is laser radar, a concept that as far as the public is concerned is only a concept. Not sure if it's actually in use yet or not for the military. However if it is it can work much, much better than conventional radar because it uses light rather than radio waves. Because the skin of stealth bombers allow radio waves to simply slide off, making it seem like the object is not there, light is not as easy to fool as it will pick up on something being there.
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[quote][b]Posted by:[/b] SymbolicUsername I wouldn't say that something like an F-117 is necessarily quiet, but it doesn't have to be up nearly as high as any other aircraft in order to not be heard. If you've ever seen one from the back, you know that it's designed to be a lot quieter than planes with more conventional propulsion systems.[/quote]well the exhaust is on top of the wing, so any sound below the aircraft will be muffled.
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I wouldn't say that something like an F-117 is necessarily quiet, but it doesn't have to be up nearly as high as any other aircraft in order to not be heard. If you've ever seen one from the back, you know that it's designed to be a lot quieter than planes with more conventional propulsion systems.
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[quote][b]Posted by:[/b] farmerscott21 Why was a stealth plane flying over your house? Were you being invaded or something?[/quote] It was just an F22. I live very close to an airport, so I have things constantly flying over my house, but I've never had a jet fly over. At least not in a while.
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[quote][b]Posted by:[/b] ME7ALMAR7IAN777 [quote][b]Posted by:[/b] mount420 I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?[/quote] An F22 has a very distinct outline. It would be difficult to confuse it with anything else.[/quote]F-15? Granted both look nothing like each other in general apperance but if you saw it from a view under the aircraft it would be hard to tell the difference. We're talking about an aircraft which will easily reach 500 MPH when flying at attitudes, it's like watching a NASCAR race but the cars are five times faster and you trying to Identife said car in the race. What town / city do you live in, you can track down units with F-22's by their HQ base location. See if there's a air force base near you, find out the name, go to Wikipedia, look up F-22 Raptor, and under units look each one up and see if their HQ is at the base near your area.
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[quote][b]Posted by:[/b] hal0 slay3r661 that is probably very true, but if computer systems fail your pretty much dead in the water.. er sky, at least the f-22 has back up systems and can fly at lower speeds with conventional wire/pulley systems, something i don't think the f-117 has. i may be wrong on that though.[/quote]Regardless, without fly-by-wire, the F-117 probably flies about as well as a poorly folded paper airplane.
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Why was a stealth plane flying over your house? Were you being invaded or something?
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When they're flying a couple thousand meters up in the air you can't hear them. They're meant to be difficult to be track by radars, thus allowing them not only go behind enemy lines but sneeking up against other aircraft.
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They're relatively quiet.
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[quote][b]Posted by:[/b] Spartan999 [quote][b]Posted by:[/b] hal0 slay3r661 well not specifically stealth based, look at the f-117, it was slow moving and hard to fly, a hybrid (f-22) that can defend itself and get out in a hurry is better than an all out stealth aircraft that can't do much past drops bombs and lumber away. [/quote] Quite so, we haven't had to spy on anyone for quite a while, that is unless you count drone reconnaissance. Though I'm sure fly-by-wire made the F-117 no more difficult to fly than any other plane.[/quote]that is probably very true, but if computer systems fail your pretty much dead in the water.. er sky, at least the f-22 has back up systems and can fly at lower speeds with conventional wire/pulley systems, something i don't think the f-117 has. i may be wrong on that though.
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Edited so I wouldn't have to engage in unnecessary conflict. [Edited on 11.03.2010 6:40 PM PDT]
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[quote][b]Posted by:[/b] Spartan999 [quote][b]Posted by:[/b] ME7ALMAR7IAN777 [quote][b]Posted by:[/b] mount420 I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?[/quote] An F22 has a very distinct outline. It would be difficult to confuse it with anything else.[/quote] It's beautiful, isn't it? Too bad it was canceled, if for no reason other than the awesome posters it could have inspired. I built a rocket with the same wing profile as the F-22 and that damn thing flies like no other.[/quote] Damn right. It's just a sexy aircraft.
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Yes they are loud, however, that doesn't mean they aren't stealth planes. All they do is not come up radar.
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[quote][b]Posted by:[/b] ME7ALMAR7IAN777 [quote][b]Posted by:[/b] mount420 I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?[/quote] An F22 has a very distinct outline. It would be difficult to confuse it with anything else.[/quote] It's beautiful, isn't it? Too bad it was canceled, if for no reason other than the awesome posters it could have inspired. I built a rocket with the same wing profile as the F-22 and that damn thing flies like no other.
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Yes F-22s are loud but that has nothing to do with radar detection.
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[quote][b]Posted by:[/b] DreadKlaw68 [quote][b]Posted by:[/b] everywhere116 [quote][b]Posted by:[/b] DreadKlaw68 Yes, the B-2 Spirit, when flying low, is incredibly loud, albeit that it's more of a deep bass rumbling. One flew over my head on it's way to Hill AFB. Oh, and to whoever said that they've been shot down before, that is incorrect. No B-2 or F-117 have been shot down; and only one B-2 has crashed (due to pilot error)[/quote] In my short time at Hill I only saw a couple of FA-18s and an A10. The museum was awesome, though.[/quote] When did you stay here? They have around 7 A-10's lined up just outside the old 419th hangar. Also, the Thunderbirds are undergoing maintenance here right now.[/quote] Last summer. And I meant "saw in the air". There were a lot more on the ground.
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[quote][b]Posted by:[/b] mount420 I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?[/quote] An F22 has a very distinct outline. It would be difficult to confuse it with anything else.
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I encountered a b-2 spirit flying overhead at an event, and it was softer than a whisper. Also how certain are you it was an f-22?
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The plane is designed to be near invisible to radar. I say near invisible because it has a very small, but still detectable cross-section. Insurgents in Bosnia used this to shoot down an F117A. Jet engines are loud, period. The fact that it has two doesn't make it any less loud. [Edited on 11.03.2010 6:28 PM PDT]
