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      mark m


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      Post #71593, posted on 02-10-2019 GMT-5 hours    
      So I was wondering where the 14ft 9in came out of a DC-9-30 to make it into a DC-9-21? I would guess not all of the plug to go from a -10 to a -30 was in front of the wings.


      Thanks,

      Mark

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      NX28388


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      Post #71594, posted on 02-10-2019 GMT-5 hours    
      From the guide published here:
      https://www.airlinercafe.com/page.php?id=396

      Look under the "DC-9-30" section for the story. There's a lot of details, but in summary the difference between the -30 fuselage and the -10/-20 fuselage was six frames forward of the wing (114") and just over three frames (65") aft of the wing. The article goes into some interesting detail about just how Douglas arranged the stretch in the fuselage tube.

      Jodie Peeler

      In 1924 Wien was Alaska's first airline. In 1980 it still is.

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      Post #71595, posted on 02-10-2019 GMT-5 hours    
      Thanks Jodie!

      As usual, it is much more complex than meets the eye.

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      Jennings


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      Post #71605, posted on 02-11-2019 GMT-5 hours    
      Yes, the -10/15/21 isnít a simple chop. The windows moved around some aft of the wing.

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      Post #71611, posted on 02-12-2019 GMT-5 hours    
      You can find the official Douglas model drawings for the DC-9-10 through -40 here:

      https://postimg.cc/gallery/28tzl0cr8/

      These include detailed dimensional data.

      Michael McMurtrey
      IPMS-USA #1746
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      Post #71612, posted on 02-12-2019 GMT-5 hours    
      These drawings were done from the MDD factory station diagrams and skin panel drawings. It shows the -21 and the -31. Note that none of the fuselage frames match up!


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      Post #71615, posted on 02-12-2019 GMT-5 hours    
      That's so weird, I wonder why they did that.... Seems like these days, most airliners are much more uniform in their frame spacing, except the 737NGs.

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      Post #71629, posted on 02-16-2019 GMT-5 hours    
      I've often wondered that myself.

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      Post #71630, posted on 02-16-2019 GMT-5 hours    
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      LH707 :
      That's so weird, I wonder why they did that.... Seems like these days, most airliners are much more uniform in their frame spacing, except the 737NGs.



      Doesn't the -21 have the -10 fuselage? I wonder if it is as simple as a decrease in the distance between the windows on the -30 to reflect a decrease in seat pitch? When the -10 was originally introduced weren't seat pitches something like 40 inches and by the time the -30 they had decreased?

      I love the way these old airliners are so different. Each model had its nuances. Heck even the same model for different airline had its own idiosyncrasies. Love it!

      Chris

      "Sorry Goose... But it's time to buzz the Tower."

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      Post #71636, posted on 02-17-2019 GMT-5 hours    
      So....

      Kurt has communicated to me that using the wings from his DC-9-30 kit combined with the rest of his DC-9-10 kit makes a DC-9-21. It would be a bit pricey but I am looking to do a SAS DC-9-21. Maybe if enough of us wanted a DC-9-20 series, he might be inspired to order the parts to make a run of kits with that combination of parts.


      I also plan to cut out plugs from his DC-9-50 kit to do a DC-9-40. I don't think I am motivated to do the same thing to build a DC-9-33/34 though.


      Too many planes, not enough time and money!

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      Post #71642, posted on 02-17-2019 GMT-5 hours    
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      mark m :
      So....


      Too many planes, not enough time and money!



      You can say that again! With the amount in my stash... And at the rate I build models... I probably have enough to keep me busy the next 20+ years. And that's NOT an exaggeration.

      Chris

      "Sorry Goose... But it's time to buzz the Tower."