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f22enthusiast
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 Posted: Jul 03, 2009 - 05:57 PM
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Joined: Oct 16, 2008 - 10:41 PM
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| Is this Raptor going supersonic? |
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Sponsor
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 Posted: May 22, 2013 - 10:34 AM
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F-16.net Sponsor
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darkvarkguy
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Posted: Jul 03, 2009 - 06:15 PM
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Joined: Mar 05, 2009 - 06:01 AM
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| Probably not. This is an oft misconception when an aircraft induces the 'Prandtl–Glauert transformation' at high speed that it is breaking the sound barrier. It is merely a compression effect on the moisture in the air. It usually occurs before Mach is attained by pushing the aircraft through the air in such a way that is displaces the air resulting in a compression and depends on the given moisture in the air. Makes for great photography though. |
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That_Engine_Guy
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Posted: Jul 03, 2009 - 06:20 PM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
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f22enthusiast wrote:
Is this Raptor going supersonic?
Quote:
A U.S. Air Force F-22 Raptor aircraft participating in Northern Edge 2009 executes a supersonic flyby over the flight deck of the aircraft carrier USS John C. Stennis (CVN 74) while the ship is underway in the Gulf of Alaska on June 22, 2009. The visual effect is created by moisture trapped between crests in a sound wave at or near the moment a jet goes supersonic. Credit: DoD/Petty Officer 1st Class Ronald Dejarnett, U.S. Navy
Trans-sonic most likely. The effect is the Prandtl–Glauert singularity - AKA, vapor cone, shock collar, MACH cone, etc
http://en.wikipedia.org/wiki/Prandtl%E2 ... ingularity
More good info here, and additional photos of other aircraft with the same PG cone.
http://www.wilk4.com/misc/soundbreak.htm
Keep 'em flyin' 
TEG |
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Tinito_16
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Posted: Jul 06, 2009 - 09:46 AM
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| Where did you find this? Can u give me the link? |
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MKopack
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Posted: Jul 06, 2009 - 03:24 PM
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Joined: Apr 08, 2004 - 11:51 PM
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Yes it is. A high-res version of the shot is available at the link below.
Mike
Quote:
090622-N-7780S-014 GULF OF ALASKA (June 22, 2009) An Air Force F-22 Raptor executes a supersonic flyby over the flight deck of the aircraft carrier USS John C. Stennis (CVN 74). John C. Stennis is participating in Northern Edge 2009, a joint exercise focusing on detecting and tracking units at sea, in the air and on land. (U.S. Navy photo by Sonar Technician (Surface) 1st Class Ronald Dejarnett/Released)
http://www.navy.mil/view_single.asp?id=73057
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SixerViper
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Posted: Jul 06, 2009 - 08:43 PM
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Joined: Jun 05, 2007 - 09:32 PM
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| And he wasn't even in burner!! |
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PhillyGuy
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Posted: Jul 07, 2009 - 04:08 AM
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SixerViper wrote:
And he wasn't even in burner!!
Or probably even in full mil. |
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sllimyaj
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Posted: Sep 16, 2010 - 09:00 PM
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Joined: Sep 16, 2010 - 08:55 PM
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PhillyGuy wrote:
SixerViper wrote:
And he wasn't even in burner!!
Or probably even in full mil.
the f-22's 2 F119-PW-100 Engine which is designed for efficient supersonic operation without afterburner (called supercruise). which is why you dont see the afterburners! |
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