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claytonyu
Topic Author
Posts: 23
Joined: Mon Jul 31, 2017 4:01 am

737 MAX Height

Tue Apr 21, 2020 9:18 am

https://www.youtube.com/watch?v=H2tuKiiznsY

I have watched this video by Vox about the 737 max, on how they have adjusted the jet engine height higher than usual (which has affected the physics of the aircraft when taking off). It was acknowledged that the 737 is lower than the A320, and a new engine cannot fit properly. My question is, why did they adjust the jet engines upward instead of making taller landing gears? I mean wouldnt all these issues not happen if they only increased the overall height of the max to match that of the A320?
 
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Starlionblue
Posts: 20385
Joined: Fri Feb 27, 2004 9:54 pm

Re: 737 MAX Height

Tue Apr 21, 2020 9:29 am

Taller landing gear has to fit somewhere. You can see in the pic how close the wheels are on a 737 when the gear is retracted.

To fit taller landing gear, you'd have to move the attachment points. That is some major redesign, which would have cost a lot of money not only in certification, but now operators have to get new ground equipment, etc etc.

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"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
claytonyu
Topic Author
Posts: 23
Joined: Mon Jul 31, 2017 4:01 am

Re: 737 MAX Height

Tue Apr 21, 2020 11:25 am

Now they are spending a fortune on the damages caused. But no one really knew this would happen looking back
 
greg85
Posts: 190
Joined: Tue Jun 26, 2007 9:45 am

Re: 737 MAX Height

Thu Apr 23, 2020 8:12 am

The 737 MAX 10 does have longer landing gear.
 
VSMUT
Posts: 4924
Joined: Mon Aug 08, 2016 11:40 am

Re: 737 MAX Height

Thu Apr 23, 2020 8:20 am

Starlionblue wrote:
To fit taller landing gear, you'd have to move the attachment points.


Which would put the landing gear right behind the engines.
 
GalaxyFlyer
Posts: 6766
Joined: Fri Jan 01, 2016 4:44 am

Re: 737 MAX Height

Thu Apr 23, 2020 2:08 pm

greg85 wrote:
The 737 MAX 10 does have longer landing gear.


More accurately, a levered gear, it’s not longer except on rotation.
 
aeropix
Posts: 273
Joined: Mon Jun 06, 2005 2:08 pm

Re: 737 MAX Height

Fri Apr 24, 2020 7:56 am

Starlionblue wrote:
Taller landing gear has to fit somewhere.
To fit taller landing gear, you'd have to move the attachment points. That is some major redesign, .


I disagree. There are several engineering solutions to make the gear taller. Even the Concorde, using 1960's technology, had telescoping main landing gear that would get "taller" when extended and "shrink" when retracting. Certainly this technique is well within Boeing's capabilities 60 years later!

No, the main reason for NOT elevating the landing gear was the desire to "grandfather" (more grandfathering on this old design, go figure!) the old escape slide requirements, particularly the over-wing exits not needing slides because of the low height of the airplane.

If the airplane height on the ground was raised up they would have to install and certify expensive escape slides to the overwing exits and perhaps also the 4 main doors additionally. They didn't want to do this so came up with the Max engine nacelle to avoid having to comply with these modern safety regulations.

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