Jet engines, explained

"ttyymmnn" (ttyymmnn) 06/11/2020 at 10:03 • Filed to: wingspan, Planelopnik

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WasGTIthenGTOthenNOVAnowbacktoGTI > ttyymmnn 06/11/2020 at 10:09

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Where do they put the magic in?

Smallbear wants a modern Syclone, local Maple Leafs spammer > ttyymmnn 06/11/2020 at 10:09

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Air-Money-Lulz

user314 > ttyymmnn 06/11/2020 at 10:10

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Damn son, why you gotta call out the J-79 that way?

;-D

ttyymmnn > WasGTIthenGTOthenNOVAnowbacktoGTI 06/11/2020 at 10:11

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That’s in the high-bypass turbofan. 

Gone > user314 06/11/2020 at 10:12

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J-79 no ise is the best noise.

WasGTIthenGTOthenNOVAnowbacktoGTI > ttyymmnn 06/11/2020 at 10:18

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Yep, that’s what I thought.......

Grindintosecond > Gone 06/11/2020 at 10:19

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F-4's, having 2 j-79s, were notoriously easy to spot head on due to the exhaust filth. We don’t see that here because of the side views, etc. The only time you couldn’t see it as they approached head on, was on after-burner. But they only had 12 minutes of fuel when on burner. So they had to practice their approaches to ground targets to keep the plane as stable as possible to minimize that smoke trail visibility.

Thomas Donohue > ttyymmnn 06/11/2020 at 10:24

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Turbineguy: Nom de Zoom > Grindintosecond 06/11/2020 at 10:27

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Ever see a B-52 squadron scramble? It blocks out the sun. 

facw > user314 06/11/2020 at 10:28

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I’m going to assume that the thick Rolls Royce engines used on the Royal Navy F-4s were even less efficient, since they were higher thrust :

Not sure if they were as smoky though...

user314 > facw 06/11/2020 at 10:31

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I didn’t think you could get less  efficient than a 50's vintage GE engine...

user314 > Turbineguy: Nom de Zoom 06/11/2020 at 10:33

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B-52s are so old they run on peat though.

facw > user314 06/11/2020 at 10:36

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Maybe not. Wikipedia does give the British Phantoms a longer ferry range, but it’s not clear if the fuel capacities considered there are the same.

just-a-scratch > WasGTIthenGTOthenNOVAnowbacktoGTI 06/11/2020 at 10:37

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Magic is only used in relatively small amounts in this type of jet engine. Ramjets and scramjets run mainly on mag ic and secrets.

user314 > WasGTIthenGTOthenNOVAnowbacktoGTI 06/11/2020 at 10:49

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That’s part of the manufacturing process.

My X-type is too a real Jaguar > ttyymmnn 06/11/2020 at 11:07

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My X-type is too a real Jaguar > ttyymmnn 06/11/2020 at 11:07

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TheRealBicycleBuck > ttyymmnn 06/11/2020 at 11:19

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That applies to anything with wings. It’s just a matter of how much money is applied.

ttyymmnn > user314 06/11/2020 at 12:57

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Rollin coal.

ttyymmnn > Thomas Donohue 06/11/2020 at 12:58

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Turbineguy: Nom de Zoom > Grindintosecond 06/11/2020 at 13:33

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It wasn’t until the F-4N that the Phantom got smokeless GE engines. Interestingly, the F-4s that went to the RAF had Rolls-Royce Spey engines that didn’t smoke. 

user314 > ttyymmnn 06/11/2020 at 13:58

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Turbineguy: Nom de Zoom > facw 06/11/2020 at 14:08

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From everything I’ve read, the Rolls Spey didn’t smoke. The US Phantoms didn’t get a smokeless engine until the F-4N in the early 70s. 

Turbineguy: Nom de Zoom > ttyymmnn 06/11/2020 at 14:09

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Ouch. 

f86sabre > ttyymmnn 06/11/2020 at 21:36

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Suck

Squeeze

Bang

Blow

ttyymmnn > f86sabre 06/11/2020 at 21:46

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Is that what they teach you in engineer school?

Rusty Vandura - www.tinyurl.com/keepoppo > f86sabre 06/11/2020 at 23:40

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Years ago on an MD-80, and engine had compressor stalls and smoke got far enough forward to make it into the bleed air and into the cabin. Emergency landing in Texark ana, full auto-brake. American Airlines. And they lost our luggage for two days. And my daughter came down with an ear infection. A night to remember.

f86sabre > ttyymmnn 06/13/2020 at 20:08

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That what I remember. 

ttyymmnn > f86sabre 06/13/2020 at 20:15

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Question: I saw on an aviation news site about a woman who cracked the inside window on an A320 . Is that necessarily dangerous? Does that inside plastic just keep you away from the actual window? Or is it integral to the whole window?

f86sabre > ttyymmnn 06/13/2020 at 20:24

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Not a huge deal. The outer window in the cabin does all the work. It’s approx 1” thick acrylic. They  do fail from time to time though.

ttyymmnn > f86sabre 06/13/2020 at 20:30

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The article equated it with the SWA incident where the engine puked and the woman got sucked out the window. But that was an entirely different sort of thing. Altogether.