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      LH707


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      Post #77685, posted on 02-25-2021 GMT-5 hours    
      Hi all, question for the group: does anybody know why Boeing has coroguard inspars on the stabilizers of many 747-8s but not on the wings?

      Some examples:

      Factory scheme pax:
      Cargolux:
      House Colors Freighter:

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      TheFlyingDutchman


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      Post #77691, posted on 02-26-2021 GMT-5 hours    
      Ok I'd like to take a guess here, but I'm really not sure if I'm right!
      The coroguard is there on the wings as well (of that I am sure, actually), but it's painted over which requires a special type of (expensive) paint. The main wings are visible for passengers, the stabilizers aren't, which might be why they didn't paint the coroguard sections on them.

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      Airbusian


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      Post #77695, posted on 02-26-2021 GMT-5 hours    
      Hi Jelle,
      Yes I can see your logic but there aren't any passengers on the freighter! So the expensive paint is pointless.
      Cheers,
      Ian

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      LH707


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      Post #77697, posted on 02-26-2021 GMT-5 hours    
      Yeah, not sure about that one either: coroguard's been around for eons, and I'm not sure they'd do away with it for that reasons if the beancounters were involved in the decisions.

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      TheFlyingDutchman


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      Post #77700, posted on 02-27-2021 GMT-5 hours    
      Quote
      Airbusian :
      Hi Jelle,
      Yes I can see your logic but there aren't any passengers on the freighter! So the expensive paint is pointless.
      Cheers,
      Ian



      That's... a really good point.

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      Timo55


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      Post #77701, posted on 02-27-2021 GMT-5 hours    
      Hi folks, here's my two-cents worth!
      We’ve had a similar discussion before here on the Café. I think this can partly be explained by paint technology. As others have said, coating of wing surfaces helps minimise ice formation caused by cold fuel, provides an anti-slip surface for maintenance as well as protecting against corrosion, abrasion, erosion, etc. My understanding is that advances in paint technology led to development of wing surface coatings using paint rather than the previously familiar corogard. Most airliners now have painted wing surfaces. Corogard type paint only seems to be used on new A320 and A330 family aircraft. A downside I believe is that paint coatings have a shorter lifespan than corogard.
      Cheers
      Tim

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      airlinerart1


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      Post #77702, posted on 02-27-2021 GMT-5 hours    
      Is it also because the wing box surfaces are made of carbon laminate on the 747-8 and 787 rather than aluminium/metal, therefore there is no need for the traditional type of Corogard to protect it and a different material is used that is either painted on or part of the paint?

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      Jennings


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      Post #77704, posted on 02-27-2021 GMT-5 hours    
      Only the trailing edge and raked wing tip on the 747-8 are made of composite. The main wing structure is metal.

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      airlinerart1


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      Post #77709, posted on 02-28-2021 GMT-5 hours    
      Quote
      Jennings :
      Only the trailing edge and raked wing tip on the 747-8 are made of composite. The main wing structure is metal.



      So any chance of answering the original question as well?

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      aro757


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      Post #77710, posted on 02-28-2021 GMT-5 hours    
      Makes the wings look more modern looking and similar to the 787 and 777 rolling off the production line?

      Regards,

      ahmed

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      Ken Miller


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      Post #77712, posted on 03-01-2021 GMT-5 hours    
      Seems to me somone needs to email Boeing and ask. There has to be a correct answer and someone at Boeing knows what it is.

      Ken

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      LH707


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      Post #77717, posted on 03-01-2021 GMT-5 hours    
      Ken, I pinged a buddy who works there, he says he'll take a look. My latest pet theory is that they left the stabilizer the same, but when they relofted the wing profile, they changed alloys and the new one doesn't corrode as readily.