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Why do the new Boeing 737 Max aircraft have scalloped edges on their nacelles?

Lisa Miles

I flew back from holiday at the weekend on one of the latest Boeing 737 Max 8-200 aircraft in the Ryanair fleet and was geeking out at it's beautiful new wing tips (much to the amusement/annoyance of other passengers in the departure lounge Blush). However, I'm interested in its new spangly nacelle design with a scalloped rear edge. 

Can any of our #Aerospace engineers let me know what the significance of it is? Is it just a pretty design element or does it have an effect on the aircraft's performance and if so, how? 

For those who'd like to geek out too, here's a couple of photos I took of the aircraft and the nacelles Slight smile

boeing 737 max 8 200 aircraft on the apron at salvaza airport in france

Boeing 737 Max 8 200 aircraft showing new scalloped nacelle design

Any info would be great so I can sound really knowledgeable on my next flight on one. Wink Joy

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  • 0

    Noise

    simpleflying.com/.../

  • 0 in reply to Roger Greenwood

    Thanks Roger Slight smile

    Is it just for noise reduction though or are there other benefits? 

  • +1 in reply to Lisa Miles

    The knock on benefit fro cost is is the reduction in weight - to meet the same acoustic standards as before, quite a lot of  what is in effect high temperature lagging can be removed. Less weight, as always in a plane, equates to better power to weight / fuel efficiency  etc. And compared to alternatives, quite cheap and low risk to retrofit to current designs. I'd expect to see something like this done on more and more designs over time.

    Messing with the inlet side, though that is also noisy,  is more dangerous as there  is a risk of creating an ice trap, and then chunks of it fall in.

    Mike.

  • 0 in reply to mapj1

    Thanks Mike. Slight smile

    I believe the Max 8's are generally more fuel efficient than their predecessors even though they carry more passengers!

    Although saying that, I think the cabin is quite tight with the extra seats in. Especially those near the additional set of emergency exits where you're up close and personal with a cabin crew member on a jump seat next to the door and literally in your face facing you! Flushed 

    I can't say I could sense any noise reduction in the cabin though but then again I always have a pair of noise reducing earbuds with me (essential equipment when flying 'cattle class') . 

    I'm going to be soooooo annoying on my next flight! Nerd Joy

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  • 0 in reply to mapj1

    Thanks Mike. Slight smile

    I believe the Max 8's are generally more fuel efficient than their predecessors even though they carry more passengers!

    Although saying that, I think the cabin is quite tight with the extra seats in. Especially those near the additional set of emergency exits where you're up close and personal with a cabin crew member on a jump seat next to the door and literally in your face facing you! Flushed 

    I can't say I could sense any noise reduction in the cabin though but then again I always have a pair of noise reducing earbuds with me (essential equipment when flying 'cattle class') . 

    I'm going to be soooooo annoying on my next flight! Nerd Joy

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