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  1.  
    Posted By: Andrew Palfreyman
    Posted By: alsetalokinThere are other problems as well. For example, the turn radius of an aircraft depends not only on bank angle but also on airspeed. At a given bank angle the turn radius of , say, a fighter jet with an approach speed of 180 knots will be significantly greater than that of, say, a light twin approaching at 100 knots. The fighter jet will have to bank much more steeply to match the radius of the circular runway than will the light twin.
    This is a design that does not lend itself well to vastly different landing speeds, since the radius and the bank are fixed.


    Wonderful! So a large metropolitan area will have to have, say, half a dozen of these circular runways of different radii, so that the cosmopolitan mix of aircraft types inevitably found in such aburban conglomerations may be accommodated, each unto its own needs.
  2.  
    You just figured that out!
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    I particularly liked the idea of an ILS antenna system on some kind of track that would run around the circle so it could be used to provide a glideslope and localizer for any touchdown point around the circumference. Couple that with an automated speech-synthesized AI system for air traffic control, and concentric runways so the six different radii won't take up so much space, and you have a perfect aviation nightmare scenario.

    Of course the new Boeings will have no windows at all and the robotic flight crew will be in a compartment in the tail.
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      CommentAuthorDuracell
    • CommentTimeApr 23rd 2017 edited
     
    Version 2.0: The turntable treadmill carousel runway matches the landing speed of each individual aircraft as required ...
  4.  
    The circular unbanked version is only circular for saving space. Landings will consist of a stall followed by mega-multi-parachute deployment with active thruster steering descent, and a squirt of VTOL jet at the end of the drop.
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      CommentAuthorAngus
    • CommentTimeApr 23rd 2017
     
    Seat backs upright please.
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      CommentAuthormaryyugo
    • CommentTimeApr 23rd 2017
     
    And underseat toilets to their full open position.
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      CommentAuthorAngus
    • CommentTimeApr 23rd 2017
     
    I always get a kick out of the delusion that an aircraft in a stall stops moving forward, like a bird coming to a perch. In fact it continues forward at the stall speed, which can be in the hundred mile an hour range, depending. It just stops flying and falls out of the sky.
  5.  
    You always get a kick out of that? Boy, you're a cheap trick!

    It depends inter alia how long you can maintain the stall configuration, which here ideally means fuselage vertical. The flat-on wings will rapidly burn off your forward speed. I think the config can be maintained longer if a power stall is used (not completely sure about that).
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      CommentAuthorAngus
    • CommentTimeApr 23rd 2017
     
    Posted By: Andrew Palfreymanthe stall configuration, which here ideally means fuselage vertical.


    That's not a stall. That's an extreme version of Pogachev's Cobra, and it needs an up-to-date Russian fighter plus an insane pilot to pull it off +at altitude+.
  6.  
    That's pedantic. Power stalls in a Cessna 150 feel about ten degrees to vertical at least. In any case, a 747 can get the wing surfaces exposed nicely to head-on motion. As usual you're nit-picking.
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      CommentAuthorAngus
    • CommentTimeApr 23rd 2017
     
    +groan+
  7.  
    Exactly
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      CommentAuthorAngus
    • CommentTimeApr 23rd 2017 edited
     
    Posted By: Andrew PalfreymanThat's pedantic. Power stalls in a Cessna 150 feel about ten degrees to vertical at least. In any case, a 747 can get the wing surfaces exposed nicely to head-on motion. As usual you're nit-picking.


    https://www.youtube.com/watch?v=vsiCSN0rj0Y

    Buck-and-four-bits goes into a power stall at about 35 mph, which makes quite a bang if you hit the ground, Attitude is more like 50 degrees off vertical, whatever it feels like.
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      CommentAuthorTrim
    • CommentTimeApr 23rd 2017
     
    Of course the new Boeings will have no windows at all and the robotic flight crew will be in a compartment in the tail.

    Can they initiate you into the mile high club?
  8.  
    Posted By: AngusBuck-and-four-bits goes into a power stall at about 35 mph, which makes quite a bang if you hit the ground, Attitude is more like 50 degrees off vertical, whatever it feels like.
    Yes - I'd dramatised the memory obviously.

    Back at my exotic landing scenario - well, those thrusters will cancel the forward speed.
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      CommentAuthorAngus
    • CommentTimeApr 24th 2017
     
    Understandable. I remember it that way too. But facts must out...
  9.  
    Any aircraft can be stalled at any attitude.
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      CommentAuthorAngus
    • CommentTimeApr 24th 2017
     
    Absolutely.

    Here, AP. This might be helpful.
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      CommentAuthoralsetalokin
    • CommentTimeApr 24th 2017 edited
     
    Nice video but the dogfighting is kind of unrealistic. With modern fighters and advanced air-to-air missiles, if you can see your opponent visually one of you is probably already dead. This ain't the First Korean War with F-86s and MiG-15s blasting at each other with cannon fire.