Aug 142013

A trio of Model 473 jetliner concepts from 1949-1950, from ebay. Note that the one at bottom is a double-decker configuration.

Boeing press release (well, part of it, anyway):

 Posted by at 7:40 pm
  • Bill H

    I notice the middle plane’s engines are significantly outboard on the wings. The big twins that Boeing eventually built – and all others- have the engines much more inboard. I wonder about the aerodynamic and wing stress analysis (considering fuel) pros and cons of that placement.

    On a Beech Bonanza, adding wingtip fuel tanks counterintuitively allows for a higher gross weight, because the extra weight out there reduces the flying bending moment at the wing root connection to the fuselage. The ultimate g-loading of most airplanes is limited by the wing bending moment. One would think that moving the weight of the engines outboard would have a similar effect.

    Apparently not, though.

    • B-Sabre

      The problem, particularly in the pre-fly-by-wire days, is asymmetric thrust from the engines if you lose one side or the other. With that huge lever arm from being that far out on the wing, I’m not sure you could put in enough rudder to counteract the turning moment it would impart.

  • publiusr

    I’d love to see the look on passengers faces if one had similar B-52 gear, the pilot landing in a crosswind with the airplane side-ways. 😉

    I think the prototype Skyfleet airliner (from Casino Royal) was meant to be an Airbus-type version of one of the craft you depict here.