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dwightlooi
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 Posted: Jun 22, 2008 - 07:32 AM
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Elite 1K
Joined: Aug 02, 2006 - 01:14 AM
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asiatrails wrote:
The F-35 is going to be loud, the 3dB difference in noise levels is equal to a doubling of the noise level. Remember the decibel scale is logarithmic so a doubling of the intensity a sound or noise always causes an increase of approximately 3 dB.
Well, thats hardly surprising. Noise is largely a factor of the amount of thrust being made and the nozzle area that thrust is exiting from. The F-35 has probably one of the highest if not the highest thrust to nozzle area ratios.
Basically, it comes down to thrust being made by pressure and volume of exhaust products. Nozzle area determines the velocity of the jet plume and mixing front between atmospheric pressure air and the pressurized discharge. 43,000 lbs is a lot of thrust -- it is roughly what propels an Airbus A320 or a newer Boeing 737 at take off from those two CFM56 engines. The exhaust area on the F135 engine is a heck of a lot smaller than that of those two high bypass turbofans combined probably something on the order of 1/5~1/6th the size. |
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 Posted: May 20, 2013 - 6:51 AM
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F-16.net Sponsor
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F15F16F22F35
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Posted: Jun 23, 2008 - 07:59 PM
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Enthusiast
Joined: Jun 20, 2008 - 07:44 PM
Posts: 42
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I wounder what would happen if an F-35 flying at only 50 feet above the ground in full AB will do to a persons ears if it goes right past you. Would you go deaf? I know they would piss themselves thats for sure.  |
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lamoey
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Posted: Jun 23, 2008 - 08:52 PM
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Forum Veteran
Joined: Apr 25, 2004 - 06:44 PM
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What... you have to ask louder as most of us have had it happen once or twice allready, with current jets  |
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Former Flight Control Technican - We keep'em flying
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F15F16F22F35
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Posted: Jun 23, 2008 - 09:00 PM
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Joined: Jun 20, 2008 - 07:44 PM
Posts: 42
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lamoey wrote:
What... you have to ask louder as most of us have had it happen once or twice allready, with current jets
I SAID WOULD YOU GO DEAF IF AN F-35 FLEW PAST SOMEONE IN FULL AB!!!!  |
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That_Engine_Guy
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Posted: Jun 24, 2008 - 01:13 AM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
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NO BUT YOU MAY TALK LIKE THIS ALL THE TIME!! SOME OF US OLDER "ENGINE GUYS" ALREADY DO!  |
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[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins
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F15F16F22F35
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Posted: Jun 24, 2008 - 07:21 PM
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Joined: Jun 20, 2008 - 07:44 PM
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That_Engine_Guy wrote:
NO BUT YOU MAY TALK LIKE THIS ALL THE TIME!! SOME OF US OLDER "ENGINE GUYS" ALREADY DO!
OH YEAH WHATS WITH THAT RINGING NOISE IN MY EARS?  |
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That_Engine_Guy
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Posted: Jun 25, 2008 - 12:26 AM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
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F15F16F22F35 wrote:
OH YEAH WHATS WITH THAT RINGING NOISE IN MY EARS?
THE RINGING WILL GO AWAY AFTER A FEW HOURS....
Remember duration of exposure is just as critical as the db of the noise.
Even up close to the Viper (or uninstalled engine) with double hearing protection (plugs & muffs) you're only allowed to be exposed to MAX power for 5 minutes per 8 hour day. |
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F15F16F22F35
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Posted: Jun 25, 2008 - 09:13 PM
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Enthusiast
Joined: Jun 20, 2008 - 07:44 PM
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That_Engine_Guy wrote:
F15F16F22F35 wrote:
OH YEAH WHATS WITH THAT RINGING NOISE IN MY EARS?
THE RINGING WILL GO AWAY AFTER A FEW HOURS....
Remember duration of exposure is just as critical as the db of the noise.
Even up close to the Viper (or uninstalled engine) with double hearing protection (plugs & muffs) you're only allowed to be exposed to MAX power for 5 minutes per 8 hour day.
Huh well I always have a ringing noise in my ears and it never goes away. Seriously I must have hearing damage. |
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Obamanite
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Posted: Jun 25, 2008 - 11:35 PM
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Senior member
Joined: May 26, 2008 - 11:10 PM
Posts: 311
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F15F16F22F35 wrote:
That_Engine_Guy wrote:
F15F16F22F35 wrote:
OH YEAH WHATS WITH THAT RINGING NOISE IN MY EARS?
THE RINGING WILL GO AWAY AFTER A FEW HOURS....
Remember duration of exposure is just as critical as the db of the noise.
Even up close to the Viper (or uninstalled engine) with double hearing protection (plugs & muffs) you're only allowed to be exposed to MAX power for 5 minutes per 8 hour day.
Huh well I always have a ringing noise in my ears and it never goes away. Seriously I must have hearing damage.
Dude, stop shouting  |
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F15F16F22F35
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Posted: Jun 26, 2008 - 12:52 AM
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Enthusiast
Joined: Jun 20, 2008 - 07:44 PM
Posts: 42
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Obamanite wrote:
F15F16F22F35 wrote:
That_Engine_Guy wrote:
F15F16F22F35 wrote:
OH YEAH WHATS WITH THAT RINGING NOISE IN MY EARS?
THE RINGING WILL GO AWAY AFTER A FEW HOURS....
Remember duration of exposure is just as critical as the db of the noise.
Even up close to the Viper (or uninstalled engine) with double hearing protection (plugs & muffs) you're only allowed to be exposed to MAX power for 5 minutes per 8 hour day.
Huh well I always have a ringing noise in my ears and it never goes away. Seriously I must have hearing damage.
Dude, stop shouting
BUT I CAN'T HEAR MY OWN VOISE! |
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rhoads56
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Posted: Aug 27, 2009 - 09:44 PM
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Newbie
Joined: Aug 27, 2009 - 09:42 PM
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LMAggie wrote:
The F-35 is definately louder than a F-16 or F-18. It probably isnt louder than a F-15, but I know when they tested the flightline runstations for F-35 ops, they brought in a F-15 to duplicate the noise levels. And its got the coolest howling noise when the pilot first goes to MIL power. Its sweet.
Was it the F-35 that made the howling noise? I would be sort of surprised if [Link pending approval] Does the F-22 make a similar noise? I thought it was only the P&W F-100 that made that noise.
-Ben |
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That_Engine_Guy
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Posted: Aug 27, 2009 - 11:15 PM
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Elite 2K
Joined: Dec 14, 2005 - 05:03 AM
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rhoads56 wrote:
Was it the F-35 that made the howling noise? I would be sort of surprised if so... Does the F-22 make a similar noise? I thought it was only the P&W F-100 that made that noise.-Ben
http://www.youtube.com/watch?v=rIiWRLlN ... re=related
From about 4:19...
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[Airplanes are] near perfect, all they lack is the ability to forgive.
— Richard Collins
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Lightndattic
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Posted: Aug 27, 2009 - 11:18 PM
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Senior member
Joined: Oct 06, 2005 - 01:43 PM
Posts: 493
Location: Dallas, Texas
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| I know I've got hearing damage from all the time I spent out on the perimeter fence watching aircraft in the pattern. I was ~100ft from a gaggle of T-37's on a regular basis, so I think that's where it came from. |
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Ztex
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Posted: Aug 28, 2009 - 05:42 AM
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Active Member
Joined: Dec 13, 2006 - 05:17 PM
Posts: 181
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spazsinbad
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Posted: Aug 28, 2009 - 07:30 AM
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Elite 3K
Joined: May 05, 2009 - 10:31 PM
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Location: OZ
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