mytai01 Posted June 10, 2014 Share Posted June 10, 2014 I know I'll get disagreement, but I've seen plenty of fighters and I haven't been able to tell any increase in noise when they go from full military power into afterburner. It's a myth! Jet engines don't get any louder than military power...with or without afterbuners on. It's annoying to watch a DCS video I've made and hearing the afterburner in the game going on and off. You won't hear that effect in a real airshow! MS Win7 Pro x64, Intel i7-6700K 4.0Ghz, Corsair RAM 16Gb,EVGA GeForce GTX 1080 FTW GAMING ACX 3.0, w/ Adjustable RGB LED Graphics Card 08G-P4-6286-KR, Creative Labs SB X-FI Titanium Fatal1ty Champ PCIe Sound Card, Corsair Neutron XTI 1TB SSD, TM Warthog Throttle & Stick, TM TPR Pedels, Oculus Rift VR Headset CV1, Klipsch Promedia 4.1 Speakers... Link to comment Share on other sites More sharing options...
strikeeagle Posted June 14, 2014 Share Posted June 14, 2014 I know I'll get disagreement, but I've seen plenty of fighters and I haven't been able to tell any increase in noise when they go from full military power into afterburner. It's a myth! Jet engines don't get any louder than military power...with or without afterbuners on. It's annoying to watch a DCS video I've made and hearing the afterburner in the game going on and off. You won't hear that effect in a real airshow! Stay away from airshows. Burner is A LOT louder than mil. Try standing 5 feet from the nozzle w/a 30 foot blowtorch come out of it. [sIGPIC][/sIGPIC] Chris Link to comment Share on other sites More sharing options...
NRG-Vampire Posted June 14, 2014 Share Posted June 14, 2014 Try standing 5 feet from the nozzle w/a 30 foot blowtorch come out of it. sure :megalol: huge punch :rotflmao: especially to eardrums Link to comment Share on other sites More sharing options...
SkateZilla Posted June 14, 2014 Share Posted June 14, 2014 I'm a Navy brat, I've been to at least 3 Airshows a Year for 28 years, I've been on the Carrier for Family Cruises. I've been on Base and in the Hanger nearly everyday after school. I've watched F-14s, F-18s, A-6s, A-7s, fly over my house for the last 25 years. And I can tell you without a Doubt, that when a plane lights the burners, it is Significantly louder. Windows 10 Pro, Ryzen 2700X @ 4.6Ghz, 32GB DDR4-3200 GSkill (F4-3200C16D-16GTZR x2), ASRock X470 Taichi Ultimate, XFX RX6800XT Merc 310 (RX-68XTALFD9) 3x ASUS VS248HP + Oculus HMD, Thrustmaster Warthog HOTAS + MFDs Link to comment Share on other sites More sharing options...
cichlidfan Posted June 14, 2014 Share Posted June 14, 2014 (edited) I am curious as to what aircraft, at what distance, the OP is referring to. Edited June 14, 2014 by cichlidfan ASUS ROG Maximus VIII Hero, i7-6700K, Noctua NH-D14 Cooler, Crucial 32GB DDR4 2133, Samsung 950 Pro NVMe 256GB, Samsung EVO 250GB & 500GB SSD, 2TB Caviar Black, Zotac GTX 1080 AMP! Extreme 8GB, Corsair HX1000i, Phillips BDM4065UC 40" 4k monitor, VX2258 TouchScreen, TIR 5 w/ProClip, TM Warthog, VKB Gladiator Pro, Saitek X56, et. al., MFG Crosswind Pedals #1199, VolairSim Pit, Rift CV1 :thumbup: Link to comment Share on other sites More sharing options...
strikeeagle Posted June 14, 2014 Share Posted June 14, 2014 As a matter of fact, when you stand near a motor in burner, the shockwaves actually affect your breathing. [sIGPIC][/sIGPIC] Chris Link to comment Share on other sites More sharing options...
NRG-Vampire Posted June 14, 2014 Share Posted June 14, 2014 sure, and make perceptible vibrations in internal organs of human body :fear: Link to comment Share on other sites More sharing options...
71st_Mastiff Posted June 14, 2014 Share Posted June 14, 2014 I know I'll get disagreement, but I've seen plenty of fighters and I haven't been able to tell any increase in noise when they go from full military power into afterburner. It's a myth! Jet engines don't get any louder than military power...with or without afterbuners on. It's annoying to watch a DCS video I've made and hearing the afterburner in the game going on and off. You won't hear that effect in a real airshow! you need to go to the doctors and have your ears checked..:thumbup: " any failure you meet, is never a defeat; merely a set up for a greater come back, " W Forbes "Success is not final, failure is not fatal, it is the courage to continue that counts," Winston Churchill " He who never changes his mind, never changes anything," MSI z690MPG DDR4 || i914900k|| ddr4-64gb PC3200 || MSI RTX 4070Ti|Game1300w|Win10x64| |turtle beach elite pro 5.1|| ViRpiL,T50cm2|| MFG Crosswinds|| VT50CM-plus rotor Throttle || G10 RGB EVGA Keyboard/MouseLogitech || PiMax Crystal VR || 32 Samsung|| Link to comment Share on other sites More sharing options...
strikeeagle Posted June 14, 2014 Share Posted June 14, 2014 (edited) Mytai is actually correct... Edited June 14, 2014 by strikeeagle [sIGPIC][/sIGPIC] Chris Link to comment Share on other sites More sharing options...
SDsc0rch Posted June 14, 2014 Share Posted June 14, 2014 this thread... wow i7-4790K | Asus Sabertooth Z97 MkI | 16Gb DDR3 | EVGA GTX 980 | TM Warthog | MFG Crosswind | Panasonic TC-58AX800U [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
strikeeagle Posted June 14, 2014 Share Posted June 14, 2014 Here's another... [sIGPIC][/sIGPIC] Chris Link to comment Share on other sites More sharing options...
karambiatos Posted June 14, 2014 Share Posted June 14, 2014 (edited) you cant use youtube videos to compare sound, because camera microphones are bad, and they cannot pickup that many decibels (and youtube makes the sound doubly bad). As an example when someone has a bad microphone and yells, the microphone will keep the soundlevel the same, or it will actually quiet down or just start braking up. Its the same as listening to guns shoot on youtube, you'd think the PKM is a really quite weapon. someguy from youtube stood about five feet to the right side and forward of two number two engine stage 5 AB runs on the trim pad at during our deployment at Cold Lake, CA in the late 80's. Wore earplug and muffs and it was still pretty loud. No heat feel but the concrete pad vibrated so much that it made my feet ache. Edited June 14, 2014 by karambiatos A 1000 flights, a 1000 crashes, perfect record. =&arrFilter_pf[gameversion]=&arrFilter_pf[filelang]=&arrFilter_pf[aircraft]=&arrFilter_DATE_CREATE_1_DAYS_TO_BACK=&sort_by_order=TIMESTAMP_X_DESC"] Check out my random mods and things Link to comment Share on other sites More sharing options...
NRG-Vampire Posted June 14, 2014 Share Posted June 14, 2014 (edited) Mytai is actually correct... i dont think so maybe its depends of aircrafts/engines but the afterburner is noticeably louder than the full mil we can measure the decibels and the sound pressure level with spec instruments (not with a microphone), yep, youtube videos are not good examples but here are another two at 2:15 http://www.youtube.com/watch?v=df3vW5HsPlc#t=135 at 6:35 Edited June 14, 2014 by NRG-Vampire Link to comment Share on other sites More sharing options...
sobek Posted June 14, 2014 Share Posted June 14, 2014 From an engineering standpoint, it would be extremely surprising if reheat didn't turn up the volume, since it significantly increases the speed and mass flow of fluid exiting the engine. If i'm not mistaken, reheat will even cause the flow to go supersonic on most designs. Good, fast, cheap. Choose any two. Come let's eat grandpa! Use punctuation, save lives! Link to comment Share on other sites More sharing options...
Exorcet Posted June 14, 2014 Share Posted June 14, 2014 If I remember, sound goes with V^8. AB increases jet velocity, so sound goes up. Awaiting: DCS F-15C Win 10 i5-9600KF 4.6 GHz 64 GB RAM RTX2080Ti 11GB -- Win 7 64 i5-6600K 3.6 GHz 32 GB RAM GTX970 4GB -- A-10C, F-5E, Su-27, F-15C, F-14B, F-16C missions in User Files Link to comment Share on other sites More sharing options...
txmtb Posted June 14, 2014 Share Posted June 14, 2014 12 years on flightlines with F-4's, F16's, F15's, and especially B-1's, tell me that there is a perceptible difference in the loudness. According to the Navy, the F15 has 144 db in Mil power and 149 db in afterburner. For acoustics, 10 db is the doubling factor, so the F15 is half again as loud in afterburner. Chart from document below: http://www.nrac.navy.mil/docs/2009_FINAL_Jet_Noise_Report_4-26-09.pdf Win 10 64 Pro, MSI Z390 I7-9700K @5ghz Kraken Z63, 32Gb Corsair Dominator, MSI RTX-2070, 1TB NVME 2TB SSD's, TM Warthog, Pro Rudders, OpenTrack w/ IR Clip Link to comment Share on other sites More sharing options...
NRG-Vampire Posted June 14, 2014 Share Posted June 14, 2014 another chart check velocity which "cause" the sound Link to comment Share on other sites More sharing options...
strikeeagle Posted June 14, 2014 Share Posted June 14, 2014 i dont think so maybe its depends of aircrafts/engines but the afterburner is noticeably louder than the full mil we can measure the decibels and the sound pressure level with spec instruments (not with a microphone), yep, youtube videos are not good examples but here are another two at 2:15 http://www.youtube.com/watch?v=df3vW5HsPlc#t=135 at 6:35 :thumbup: 12 years on flightlines with F-4's, F16's, F15's, and especially B-1's, tell me that there is a perceptible difference in the loudness. According to the Navy, the F15 has 144 db in Mil power and 149 db in afterburner. For acoustics, 10 db is the doubling factor, so the F15 is half again as loud in afterburner. Nice chart. After I watched those youtubes I thought back to when I was doing real time reads while the motor was in burner and at mil power the motor is pretty loud. You can notice a slight increase in sound. I think the further away the more its noticeable. [sIGPIC][/sIGPIC] Chris Link to comment Share on other sites More sharing options...
txmtb Posted June 14, 2014 Share Posted June 14, 2014 :thumbup: Nice chart. After I watched those youtubes I thought back to when I was doing real time reads while the motor was in burner and at mil power the motor is pretty loud. You can notice a slight increase in sound. I think the further away the more its noticeable. When we started working with B-1's, we had to add locking rods to our bookshelves with all the T.O.'s in them. They would literally vibrate the books out of the shelf with AB takeoffs. IIRC correctly, we were about 400' from centerline. Win 10 64 Pro, MSI Z390 I7-9700K @5ghz Kraken Z63, 32Gb Corsair Dominator, MSI RTX-2070, 1TB NVME 2TB SSD's, TM Warthog, Pro Rudders, OpenTrack w/ IR Clip Link to comment Share on other sites More sharing options...
doright Posted June 14, 2014 Share Posted June 14, 2014 http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&ved=0CDgQFjAE&url=http%3A%2F%2Fwww.nrac.navy.mil%2Fdocs%2F2009_FINAL_Jet_Noise_Report_4-26-09.pdf&ei=qoqcU-iDDsqsyATRvIDwAw&usg=AFQjCNEVKJJaBIgCFr_WjDcGR9SzYDaCXA&bvm=bv.68911936,d.aWw&cad=rja "Afterburners increase the jet noise levels by 5 to 10 dB above military power." (remember decibels are a log scale measurement) Can't judge noise level from a video without knowing the cut off frequencies of the camera's microphone and digital compression method. Additionally it is likely the microphone and amplifier are simply saturated. They are meant to pick up human speech not deafness inducing noise fields. My computer system just isn't up to the task of generating the low frequency power of an jet engine in afterburner, so as a compromise I imagine DCS's sound editor just adjusted the overall sound to be louder in afterburner. Much easier and cheaper then keeping a jet engine in your room for sound effect purposes. Link to comment Share on other sites More sharing options...
doright Posted June 14, 2014 Share Posted June 14, 2014 When we started working with B-1's, we had to add locking rods to our bookshelves with all the T.O.'s in them. They would literally vibrate the books out of the shelf with AB takeoffs. IIRC correctly, we were about 400' from centerline. I worked at Boeing in Wichita adjacent to McConnell AF base in the 80s when they got the B-1b's. It was funny to hear all the car alarms going off in the parking lot when a B-1 did an afterburner takeoff. Link to comment Share on other sites More sharing options...
sobek Posted June 14, 2014 Share Posted June 14, 2014 For acoustics, 10 db is the doubling factor, so the F15 is half again as loud in afterburner. If talking SPL: 20*log10(2) ~= 6dB Good, fast, cheap. Choose any two. Come let's eat grandpa! Use punctuation, save lives! Link to comment Share on other sites More sharing options...
txmtb Posted June 14, 2014 Share Posted June 14, 2014 I worked at Boeing in Wichita adjacent to McConnell AF base in the 80s when they got the B-1b's. It was funny to hear all the car alarms going off in the parking lot when a B-1 did an afterburner takeoff. I was across the runway from you then, about the '87/'88 time frame. Right in the middle between the taxiway and the runway. Win 10 64 Pro, MSI Z390 I7-9700K @5ghz Kraken Z63, 32Gb Corsair Dominator, MSI RTX-2070, 1TB NVME 2TB SSD's, TM Warthog, Pro Rudders, OpenTrack w/ IR Clip Link to comment Share on other sites More sharing options...
txmtb Posted June 14, 2014 Share Posted June 14, 2014 If talking SPL: 20*log10(2) ~= 6dB I think it varies depending on what is being measured? +3db measured power is double, +6 db measured voltage is doubled, and +10 db measured sound is double. Win 10 64 Pro, MSI Z390 I7-9700K @5ghz Kraken Z63, 32Gb Corsair Dominator, MSI RTX-2070, 1TB NVME 2TB SSD's, TM Warthog, Pro Rudders, OpenTrack w/ IR Clip Link to comment Share on other sites More sharing options...
tarracta Posted June 14, 2014 Share Posted June 14, 2014 I know I'll get disagreement, but I've seen plenty of fighters and I haven't been able to tell any increase in noise when they go from full military power into afterburner. It's a myth! Jet engines don't get any louder than military power...with or without afterbuners on. It's annoying to watch a DCS video I've made and hearing the afterburner in the game going on and off. You won't hear that effect in a real airshow! The Concorde wasn't allow to use afterburners over rural areas because of the sonic boom AND the dramatically louder engines running on burner. Link to comment Share on other sites More sharing options...
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