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  • Flyinghawk
    Rank 4 Registered User
    • Sep 2015
    • 13

    Lift fan VTOL aircraft

    There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:



    Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:



    http://www.mdpi.com/2226-4310/2/4/555/htm

    Which design is better?
  • Robbiesmurf
    Rank 5 Registered User
    • Jul 2014
    • 587

    #2
    The first one. If one wing tip fan fails then control would be rather labour intensive. The Kestrel/Harrier series had the thrust-lines close to the centre-line to reduce assymetry. Even then, they could be a handful at times.

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    • Gerard
      Rank 5 Registered User
      • Aug 2009
      • 3178

      #3
      what's new
      Last edited by Gerard; 19th November 2015, 21:48.
      For Roundels of the World: http://www.drareg.nl/Markeringen/index.html or Facebook: https://www.facebook.com/groups/481843655359127/

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      • Robbiesmurf
        Rank 5 Registered User
        • Jul 2014
        • 587

        #4
        The top picture, I think the fiscal number is a bit of a clue.

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        • mrmalaya
          Generation 4.75+++
          • Jan 2010
          • 4664

          #5
          the difference is the amount of propulsive energy compared to the weight of the aircraft and the comparative dead weight on the fans

          Click image for larger version

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          http://aviationweek.com/nbaa-2015/xt...iminary-design

          A well supported design with momentum

          Comment

          • obligatory
            Senior Member
            • Oct 2008
            • 7043

            #6
            Originally posted by Flyinghawk View Post
            There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:



            Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:



            http://www.mdpi.com/2226-4310/2/4/555/htm

            Which design is better?
            i rather like the simplicity of the 2nd design, i hope its built so we may see how it perform, and how it can be improved

            Comment

            • stealthflanker
              Rank 5 Registered User
              • Sep 2015
              • 1027

              #7
              Well what's the requirement ? that's when things can get fair.


              ---
              Design wise though im not really a fan of "In body" ducted fan as it's awkward and somewhat limiting payload.

              The second design, well.. Hiller VZ-1 anyone :3 ?

              Click image for larger version

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              Control for 2nd design might be similar as VZ-1

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              • Robbiesmurf
                Rank 5 Registered User
                • Jul 2014
                • 587

                #8
                It has 'pop-up'and 'look-down' features.

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                • obligatory
                  Senior Member
                  • Oct 2008
                  • 7043

                  #9
                  i'm in awe, i didnt know it was built already

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                  • MadRat
                    Rank 5 Registered User
                    • Aug 2006
                    • 5032

                    #10
                    Imagine what Hiller's design would look with three axis tilting ring rather than its two dimensional paddles. Can't be any less efficient than a one-man helicopter.
                    Go Huskers!

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                    • Flyinghawk
                      Rank 4 Registered User
                      • Sep 2015
                      • 13

                      #11
                      Hiller's design can go up and down. It cannot fly forward quickly.

                      The TriFan has three fans. How to balance the torque of the third fan?

                      Comment

                      • TooCool_12f
                        Rank 5 Registered User
                        • Dec 2009
                        • 3323

                        #12
                        make it double counter-rotative and you have no torque to fight against

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                        • Victor
                          Nobama 08 Keep the change
                          • Jan 2000
                          • 2059

                          #13
                          Don't forget the Airmule:
                          But what a fool believes, he sees
                          No wise man has the power to reason away

                          -The Doobie Brothers

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                          • obligatory
                            Senior Member
                            • Oct 2008
                            • 7043

                            #14
                            the first design is junk from start to finish, Osprey already exist and does it better,
                            however i want to see how the 2nd design perform, with the outer frame counter balance the propeller.

                            Comment

                            • Flyinghawk
                              Rank 4 Registered User
                              • Sep 2015
                              • 13

                              #15
                              The 2nd design has a double counter rotative fan in the annular duct. The turbofan jet engines on the outer frame provide forward thrust.

                              Comment

                              • aditya
                                From the Flanker Temple
                                • Jan 2000
                                • 838

                                #16
                                Originally posted by Flyinghawk View Post
                                There are two new lift fan designs. One is the Boeing Phantom Swift, which uses two internal lift fans and two wing tip ducted fans.Here is the picture:



                                Another one is an annular ducted lift fan VOTL aircraft, which uses one annular duct:



                                http://www.mdpi.com/2226-4310/2/4/555/htm

                                Which design is better?
                                Definitely the first one:

                                Click image for larger version

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