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AND NOW - HOw do those Jet engines REVERSE upon landing?

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AND NOW - HOw do those Jet engines REVERSE upon landing?

 
Old 03-14-2019, 03:52 PM
  #41  
JetMechZ16
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Here is a TF34 engine produced by GE it goes in an S3 Viking you can see a much larger fan on this engine.

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Old 03-14-2019, 04:19 PM
  #42  
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Interesting video above explaining the reverse thrust. Thanks and learned something new today.
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Old 03-14-2019, 04:52 PM
  #43  
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Amazing how plane threads always take off on this forum.


Treadmill or not
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Old 03-14-2019, 04:57 PM
  #44  
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VegasJen,

The newer turbo-fan engines are also referred to as a Hign bypass engine. What this means is a portion of the thrust developed by the engine “Bypasses” the hot portion of the engine, ie. the compressors, combustion chambers and turbine sections in the rear. The first generation jets, also referred to a pure jets only included the hot sections. One day somebody pretty smart figured out that if you added a large fan blade out in front of all this rapidly rotating mass and cowled this fan so the thrust was directed around the engine, not through it, it was creating a large benefit for a small penalty. During the 60’s the fan became much larger and the High Bypass engine was perfected. A by product of this engine, as Silverback and others have stated, is it’s much quieter and way more fuel efficient. The reason it’s quieter is the noise developed from a jet originates from the very hot gasses escaping out of the rear of the jet into the very cold air, the temp difference is what creates the loud sound. With the high by pass engines the hot core gases are totally enveloped by the cool fan air that bypasses combustion, so the sound is muffled by a cylinder of cool air from the bypass air.
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Old 03-14-2019, 05:20 PM
  #45  
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Originally Posted by mchar View Post
I know some planes have those shields that re- direct flow to brake.
I see now the Jet Engines go in Reverse.
'Splain me that -
example -3:20 a 747 landing -
https://www.youtube.com/watch?v=9fGQL7rBH8Q
you can see the sides open up at the 3:20 mark which is when you see the spray move forward you're referencing

Last edited by ZeusC6; 03-14-2019 at 05:23 PM.
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Old 03-15-2019, 02:22 AM
  #46  
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Thought it was interesting that weight on the wheels allow the reverse thrusters to activate. Apparently the early ones didn't have this safety feature. Years ago there was a crash of a Lauda Air plane in Asia. The investigation started that the reverse thrusters engaged in mid flight.
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Old 03-15-2019, 09:42 AM
  #47  
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Big Jay E,
My explanation of the weight on wheels function was simplified for my post. There are a few different systems used on aircraft to ensure the thrust reversers don’t activate in flight. Most aircraft do have a “ weight on Wheels” / air ground mode system that allows certain systems to operate only in the Air or on the ground...Other jets, like the one in my avatar can deploy the thrust reversers in flight, the DC-8 could also. In the case of the C-17 (my avatar) we could deploy all 4 reversers and descend at 20,000 ft/minute. It came in handy at times flying into a combat zone, but you better be aware of what’s happening when you execute this tactic.

Last edited by chiefttp; 03-15-2019 at 09:52 AM.
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Old 03-15-2019, 02:58 PM
  #48  
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Originally Posted by chiefttp View Post
Big Jay E,
My explanation of the weight on wheels function was simplified for my post. There are a few different systems used on aircraft to ensure the thrust reversers don’t activate in flight. Most aircraft do have a “ weight on Wheels” / air ground mode system that allows certain systems to operate only in the Air or on the ground...Other jets, like the one in my avatar can deploy the thrust reversers in flight, the DC-8 could also. In the case of the C-17 (my avatar) we could deploy all 4 reversers and descend at 20,000 ft/minute. It came in handy at times flying into a combat zone, but you better be aware of what’s happening when you execute this tactic.
wheeeeeeeeee

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Old 03-15-2019, 03:42 PM
  #49  
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Originally Posted by chiefttp View Post
In the case of the C-17 (my avatar) we could deploy all 4 reversers and descend at 20,000 ft/minute. It came in handy at times flying into a combat zone, but you better be aware of what’s happening when you execute this tactic.


That sounds like a wild ride. I'd love to ride along while they do that.
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Old 03-15-2019, 11:28 PM
  #50  
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Originally Posted by abusdriver View Post
Jet engine operation simplified:

SUCK - SQUEEZE - BLOW - GO!

No..... Suck, squeeze, bang, blow.

On the 727, F100, and MD80 we used to use the reversers to back off the gate instead of using a tug.

Last edited by F4Gary; 03-15-2019 at 11:29 PM.
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Old 03-15-2019, 11:58 PM
  #51  
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I was standing at the gate one day, looking out the window as our plane was taxiing in. A passenger came over to me and said, "You know, I've always wondered...Are those planes front wheel drive or rear wheel drive?" I was dumbfounded and the only thing I could come up with was, "Neither. They're 3 wheel drive." The pax just nodded his head and slowly walked away.
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Old 03-16-2019, 06:50 AM
  #52  
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Originally Posted by chiefttp View Post
Big Jay E,
My explanation of the weight on wheels function was simplified for my post. There are a few different systems used on aircraft to ensure the thrust reversers don’t activate in flight. Most aircraft do have a “ weight on Wheels” / air ground mode system that allows certain systems to operate only in the Air or on the ground...Other jets, like the one in my avatar can deploy the thrust reversers in flight, the DC-8 could also. In the case of the C-17 (my avatar) we could deploy all 4 reversers and descend at 20,000 ft/minute. It came in handy at times flying into a combat zone, but you better be aware of what’s happening when you execute this tactic.
I'm just curious, is this what Nasa flyers do when they go up for some weightlessness training floating around the plane?
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Old 03-16-2019, 11:23 AM
  #53  
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Originally Posted by slewfoot1956 View Post
I'm just curious, is this what Nasa flyers do when they go up for some weightlessness training floating around the plane?
No. They fly a parabolic arc from a climb into a descent.



It's actually a very low speed maneuver as the aircraft nears the top of the arc.
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Old 03-16-2019, 03:34 PM
  #54  
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A jet engine works on the exact principal as a fart, except you can't reverse a fart. You're welcome.
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Old 03-16-2019, 03:42 PM
  #55  
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Originally Posted by ThePirate View Post
A jet engine works on the exact principal as a fart, except you can't reverse a fart.
Why would you want to?
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Old 03-16-2019, 05:37 PM
  #56  
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Originally Posted by Meh View Post


That sounds like a wild ride. I'd love to ride along while they do that.
The Space Shuttle pilots used to train in a Gulfstream G2 that could go full reverse in flight to simulate the descent rate of the shuttle prior to landing.
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Old 03-16-2019, 06:32 PM
  #57  
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Originally Posted by F4Gary View Post
The Space Shuttle pilots used to train in a Gulfstream G2 that could go full reverse in flight to simulate the descent rate of the shuttle prior to landing.
As I recall at one point someone said of the shuttle that it didn't fly back to earth, it fell at an angle.
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Old 03-16-2019, 09:30 PM
  #58  
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Originally Posted by VegasJen View Post
As I recall at one point someone said of the shuttle that it didn't fly back to earth, it fell at an angle.
About the glide ratio of one of these

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Old 03-21-2019, 09:50 PM
  #59  
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Chief you have educated me and others with this thread. I appreciate it more than you know - I'm the OP!!
CFOT, I doubt there is a forum anywhere that can teach us things about anything in the world like CFOT does -
Airplanes Chief and ROTORHEAD - what?? -Fishing - Crabr1 - Annuities -777 - Real Estate - T+G Fan... and on and on...

Other jets, like the one in my avatar can deploy the thrust reversers in flight, the DC-8 could also. In the case of the C-17 (my avatar) we could deploy all 4 reversers and descend at 20,000 ft/minute. It came in handy at times flying into a combat zone, but you better be aware of what’s happening when you execute this tactic.
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Old 03-21-2019, 10:10 PM
  #60  
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Originally Posted by jprop View Post
I was standing at the gate one day, looking out the window as our plane was taxiing in. A passenger came over to me and said, "You know, I've always wondered...Are those planes front wheel drive or rear wheel drive?" I was dumbfounded and the only thing I could come up with was, "Neither. They're 3 wheel drive." The pax just nodded his head and slowly walked away.
And sometimes they street race...er...airport race...


Last edited by abusdriver; 03-21-2019 at 10:11 PM.
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