-akyla- Posted October 31, 2007 Posted October 31, 2007 I just had a question and i would like to know if we will be able to fly without these thing's? i dont even know what they are called:) [sIGPIC][/sIGPIC]
Yellonet Posted October 31, 2007 Posted October 31, 2007 The exhausts? i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
Yellonet Posted October 31, 2007 Posted October 31, 2007 Yeah I guess you can fly without them, but the engines will likely lose some performance as the exhaust gases isn't led away effectively. i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
RvETito Posted October 31, 2007 Posted October 31, 2007 They don't affect engine performance that much. This is a turboshaft engine, not a turbojet- which means all thrust is would produce is a loss- you want to convert all the energy into power output to free turbine shaft. Their purpose is to decrease engines IR signature so you'd be more happy with them ;) "See, to me that's a stupid instrument. It tells what your angle of attack is. If you don't know you shouldn't be flying." - Chuck Yeager, from the back seat of F-15D at age 89. =RvE=
Yellonet Posted October 31, 2007 Posted October 31, 2007 They don't affect engine performance that much. This is a turboshaft engine, not a turbojet- which means all thrust is would produce is a loss- you want to convert all the energy into power output to free turbine shaft. Their purpose is to decrease engines IR signature so you'd be more happy with them ;)Hmm... then to a followup question, if they're damaged, will your IR signature increase acordingly? Heat leaking out on to the body... i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
RvETito Posted October 31, 2007 Posted October 31, 2007 More likely the IR sugnature will change in case of an exhaust pipe damage but to what extent it's not quiet clear as it has random nature- you're mixing hot and cold gases there. If you ask about BS's IR sig modeling- I can't tell anything ;) "See, to me that's a stupid instrument. It tells what your angle of attack is. If you don't know you shouldn't be flying." - Chuck Yeager, from the back seat of F-15D at age 89. =RvE=
Yellonet Posted October 31, 2007 Posted October 31, 2007 More likely the IR sugnature will change in case of an exhaust pipe damage but to what extent it's not quiet clear as it has random nature- you're mixing hot and cold gases there. If you ask about BS's IR sig modeling- I can't tell anything ;)Ahh... stupid NDA :P i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
Force_Feedback Posted October 31, 2007 Posted October 31, 2007 But is it possible to fly without them and have that extra 100-200 HP of shaft power? Creedence Clearwater Revival:worthy:
britgliderpilot Posted October 31, 2007 Posted October 31, 2007 But is it possible to fly without them and have that extra 100-200 HP of shaft power? The shaft horsepower depends on how much energy the free power turbine can extract from the gas flow - the exhausts don't have any effect on that. http://img.photobucket.com/albums/v121/britgliderpilot/BS2Britgliderpilot-1.jpg
Yellonet Posted October 31, 2007 Posted October 31, 2007 The shaft horsepower depends on how much energy the free power turbine can extract from the gas flow - the exhausts don't have any effect on that.So it doesn't require any back pressure like a normal explosion engine? i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
britgliderpilot Posted October 31, 2007 Posted October 31, 2007 So it doesn't require any back pressure like a normal explosion engine? Eh? You don't need pressure between the free power turbine and the exhaust - you need it between the gas generator (effectively a normal turbojet producing high-energy gas flow) and the free power turbine. The exhaust is there to get rid of hot waste gases (here in as well-mixed and cool a way as possible), not produce thrust. http://img.photobucket.com/albums/v121/britgliderpilot/BS2Britgliderpilot-1.jpg
Yellonet Posted October 31, 2007 Posted October 31, 2007 Eh? You don't need pressure between the free power turbine and the exhaust - you need it between the gas generator (effectively a normal turbojet producing high-energy gas flow) and the free power turbine. The exhaust is there to get rid of hot waste gases (here in as well-mixed and cool a way as possible), not produce thrust.Ok, I was just wondering if there was a need for back pressure as in a car engine which performance would degrade without a proper exhaust system, (edit: this probably only applies to carburator engines though) But I guess not then... that big pipe doesn't give much resistans anyway :) i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
RvETito Posted October 31, 2007 Posted October 31, 2007 But is it possible to fly without them and have that extra 100-200 HP of shaft power? These are the intake dust protectors that 'eat' 100HP, not the exhaust pipes. And those you can't remove. If the dust protector is hit(destroyed) you'll most likely suffer full engine failure because of FOD. "See, to me that's a stupid instrument. It tells what your angle of attack is. If you don't know you shouldn't be flying." - Chuck Yeager, from the back seat of F-15D at age 89. =RvE=
Smith Posted October 31, 2007 Posted October 31, 2007 Sorry for noob question, but what's FOD? Bye, Smith [sIGPIC][/sIGPIC] i5-9600K @5ghz, 11GB ZOTAC GeForce RTX 2080 Ti Twin Fan, 32GB (2x 16384MB) Corsair Vengeance LPX schwarz DDR4-3000 DIMM, 1000GB WD Black SN750 Gaming M.2, HP Reverb HMD, TM Warthog Hotas Stick & Throttle, Realsimulator FSSB R3 Stickbase, TM TPR pedals
Sundowner.pl Posted October 31, 2007 Posted October 31, 2007 Foreign Object Damage BTW, a back pressure on turbine engine may lower the performance, that was the issue with T58-GE-3 engines on UH-1F/P. [sIGPIC][/sIGPIC] "If a place needs helicopters, it's probably not worth visiting." - Nick Lappos
RvETito Posted October 31, 2007 Posted October 31, 2007 FOD=Foreign Object Damage. Known term for gas-turbine engines, it means a damage caused bu suction of foreign object- bird, stone or any debris. "See, to me that's a stupid instrument. It tells what your angle of attack is. If you don't know you shouldn't be flying." - Chuck Yeager, from the back seat of F-15D at age 89. =RvE=
-akyla- Posted October 31, 2007 Author Posted October 31, 2007 i guess we can choose to fly with or without exhaust in the skin section:) nobody needs to answer this one;) [sIGPIC][/sIGPIC]
bradmick Posted October 31, 2007 Posted October 31, 2007 Could be debris as well, FOD (foreign object debris) checks are a marvelous time of scouring the airfield for anything significant enough that can damage the airplane. Fun is had by all when its FOD clean up day. Brad
Force_Feedback Posted October 31, 2007 Posted October 31, 2007 Seen any pictures of Russian runways? Not even mentioning the taxiways and aprons. Guess dust protectors are at the least mandatory. Creedence Clearwater Revival:worthy:
Focha Posted November 2, 2007 Posted November 2, 2007 Mmm... I think you guys should read a bit more about helicopters... Try Wikipedia.org or put helicopter principles on Yahoo. That will help you guys to achieve your goals. It is simple. The damage on exaust is a random event so you can get a FUBAR or you can get a "no sweat" situation and continue to fly without problem. It all depends on the level of damage and what damage it is. Best regards Focha ASUS N552VX | i7-6700HQ @ 2.59GHz | 16 GB DDR3 | NVIDIA GF GTX 950M 4 Gb | 250 Gb SSD | 1 Tb HD SATA II Backup | TIR4 | Microsoft S. FF 2+X52 Throttle+Saitek Pedals | Win 10 64 bits
Yellonet Posted November 2, 2007 Posted November 2, 2007 Mmm... I think you guys should read a bit more about helicopters... Try Wikipedia.org or put helicopter principles on Yahoo. That will help you guys to achieve your goals. It is simple. The damage on exaust is a random event so you can get a FUBAR or you can get a "no sweat" situation and continue to fly without problem. It all depends on the level of damage and what damage it is. Best regards FochaMhmm... pretty much like with everything mechanical then... go figure ;) i7-2600k@4GHz, 8GB, R9 280X 3GB, SSD, HOTAS WH, Pro Flight Combat Pedals, TIR5
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