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| Member |
Can the sonic boom occur only When the aircraft is moving very specifically faster than the air around it ? https://www.yahoo.com/news/2-p...-over-155009611.html If the air space that the craft is flying through is moving much faster or much slower, With or against, Will affect the point at which the boom occures ? Safety, Situational Awareness and proficiency. Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first | ||
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| As Extraordinary as Everyone Else  |
Yes. ------------------ Eddie Our Founding Fathers were men who understood that the right thing is not necessarily the written thing. -kkina | |||
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| Member |
Airspeed, not ground speed is what matters | |||
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Baroque Bloke |
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אַרְיֵה |
Temperature, too. הרחפת שלי מלאה בצלופחים | |||
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| Member |
I think the basic questions have been answered, but going back to OP: No, the passenger jet flying in a strong jet stream did not create a sonic boom. | |||
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| Member |
Thanks folks, Makes me wonder about how fast and how low Mr. Fancy pants big shot was when we got an unannounced fly by Just out side of death valley, One fall day when the ambient temperature was about 65 degrees F. The boom came close to my head putting a sun roof in the pickup ceiling. I made the mistake of looking horizontally after jumping out of the truck. No,So, east and west. But he went straight the hell up. By the time I got eyes on him he was but a glint of reflected sun light . Safety, Situational Awareness and proficiency. Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first | |||
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Optimistic Cynic |
Headwind or tailwind? I am sure that commercial flights don't get anywhere near the speed of sound. But that leads to another question. What does a sonic boom sound like inside the aircraft? Does it rattle the airframe, or cause perceptible physical motion? | |||
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| Member |
You don't hear it or feel it, as far as I remember, but I only exceeded the sound barrier once. We didn't even feel the tremor that I would have expected as the plane passed it. -------------------------- Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats. -- H L Mencken I always prefer reality when I can figure out what it is. -- JALLEN 10/18/18 | |||
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| Dances With Tornados |
Haulin' Ass !!! 800 MPH Jet Airliners over the Atlantic to Europe. This is extraordinary. "Planes top 800 mph as near-record winds sweep high over Mid-Atlantic The planes were propelled by a record jet stream that reached 265 mph over Washington" "Winds roared to speeds of 265 mph high over Washington — at about 35,000 feet above ground, cruising altitude for airplanes — as a powerful jet stream swept over the region late Saturday. These winds allowed at least three commercial aircraft to reach speeds over 800 mph" LINK to story CLICK Link to the rest of the story . . | |||
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Member |
Can't read. It's behind a paywall....  800mph is ground speed, correct? Not relative to the aircraft? _________________________________________________________________________ “A man’s treatment of a dog is no indication of the man’s nature, but his treatment of a cat is. It is the crucial test. None but the humane treat a cat well.” -- Mark Twain, 1902 | |||
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| No More Mr. Nice Guy |
Typical airliner airspeed is about 3/4 the speed of sound. Some a bit faster, some a bit slower. We would be anywhere from .70 to .82 the speed of sound in the airliners I flew. Lots of factors such as altitude, fuel load, schedule, and winds aloft. Mach number is the fraction of the speed of sound, so Mach .75 is 3/4ths the speed of sound. The speed of sound is only dependent on the air temperature. Density has no effect, so altitude has no effect other than the temperature gets colder as you go higher. Which means the airplane's airspeed gets slower for any particular mach number as one goes higher. But the true airspeed, which is how fast you are actually going relative to the air itself, increases as the air gets thinner. So as you climb up, your true airspeed is increasing until you get to your desired mach number, and then you fly that mach number which means your true airspeed is reducing as you climb higher. High altitude aviation has some quirks and gotchas which the pilot needs to understand to stay out of trouble. | |||
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| Member |
I live by the 148th with their Block 50 F-16CM's, they sometimes get frisky before they are too far out over Lake Superior and shake windows. 2-3 years ago there was a NG crash over in UP MI and they scrambled without concern. “Let us dare to read, think, speak and write.” John Adams | |||
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| SIGforum Official Eye Doc  |
Just how close? | |||
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| אַרְיֵה |
"highest-known recorded speeds for passenger flights" -- must have been written by a really young reporter, born after the SST was retired from service. הרחפת שלי מלאה בצלופחים | |||
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| Member |
In the 60s and very early 70s we heard sonic booms all the time at my grandparents’ house in Oak Cliff (part of Dallas) that was close to both the Naval Air Station and Love Field (then the main Dallas airport). The “no sonic booms” law passed in 1973. | |||
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Character, above all else |
No, you don't hear or feel it at all. In the Hornet, the nose would begin to slightly hunt up and down as the shock wave built up on the nose. But we only noticed it in level flight and very high (35,000-42,000 feet) when we would haul ass at 0.95M during a cross country flight. During dogfights when you elect to leave the area, you do it by dumping the nose and plugging in the burners and accelerating out of there. More than once (and only in approved areas) I found myself accelerating above mach when I was looking over my shoulder for the bad guys. It's easy to do and not be aware of it unless you're watching your airspeed. "The Truth, when first uttered, is always considered heresy." | |||
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| Member |
I wish the article in the o.p. would have stated how much earlier the plane got to its destination. 45 min. ? 90 min. Early? Safety, Situational Awareness and proficiency. Neck Ties, Hats and ammo brass, Never ,ever touch'em w/o asking first | |||
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Member |
Impressive. I didn't comprehend all of the physics, but that is fascinating. Lover of the US Constitution Wile E. Coyote School of DIY Disaster | |||
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| אַרְיֵה |
The information is clearly stated in the linked article, near the beginning. הרחפת שלי מלאה בצלופחים | |||
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