Aircraft
05-26-2019, 09:57 PM
#51
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Joined APC: Feb 2007
Posts: 7,339
Originally Posted by symbian simian
No way with the amount of blade overlap will we get reverse with variable pitch.
05-26-2019, 10:16 PM
#52
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Joined APC: Dec 2006
Position: 737 FO
Posts: 2,370
Originally Posted by Mesabah
It only needs to move 15 degrees. The issue is the complexity of adding yet another system for certification along with the gearbox. I doubt the variable pitch makes it to the 2025 target date, but comes later, ~2030 time frame.
I'm not sure what you mean about 15 degrees though, are you talking about for an effective braking movement from the blades?
05-26-2019, 11:05 PM
#53
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Joined APC: Apr 2018
Posts: 2,987
Originally Posted by Baradium
I am really pessimistic about that kind of technology. I agree, I have a hard time imagining it being out in less than 10 years.
I'm not sure what you mean about 15 degrees though, are you talking about for an effective braking movement from the blades?
I'm not sure what you mean about 15 degrees though, are you talking about for an effective braking movement from the blades?
05-27-2019, 06:58 AM
#54
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Joined APC: Feb 2007
Posts: 7,339
Originally Posted by Baradium
I am really pessimistic about that kind of technology. I agree, I have a hard time imagining it being out in less than 10 years.
I'm not sure what you mean about 15 degrees though, are you talking about for an effective braking movement from the blades?
I'm not sure what you mean about 15 degrees though, are you talking about for an effective braking movement from the blades?
It creates massive amounts of drag, the thrust does not reverse out of the engine. The extreme bypass ratio, and the size of the fan blades, because they are composite, make this possible.
05-27-2019, 09:45 AM
#55
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Joined APC: Apr 2011
Position: retired 767(dl)
Posts: 5,724
Originally Posted by Mesabah
It creates massive amounts of drag, the thrust does not reverse out of the engine. The extreme bypass ratio, and the size of the fan blades, because they are composite, make this possible.
05-27-2019, 07:14 PM
#57
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Joined APC: Jun 2015
Posts: 1,642
Originally Posted by Mesabah
It creates massive amounts of drag, the thrust does not reverse out of the engine. The extreme bypass ratio, and the size of the fan blades, because they are composite, make this possible.
05-28-2019, 09:50 AM
#59
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Joined APC: Feb 2007
Posts: 7,339
Originally Posted by badflaps
That is going to have some rudder.
05-28-2019, 10:14 AM
#60
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Joined APC: Mar 2015
Position: stake holder ir.delta.com
Posts: 10,034
Originally Posted by Mesabah
You would almost certainly crash if that system activated in flight, that's why there must be some kind of mechanical shear pin that separates the main fan from the rest of the engine. At what point do they say enough is enough on engine reliability vs fuel savings. The 737Max is certainly a causality of this process.
Animated Engines - Gnome Rotary
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