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Bell V280 Valor or Sikorsky and Boeing Defiant

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  • #16
    Originally posted by jlvfr View Post
    The Defiant reminds me of Kamov's designs, and bringhts out a doubt I've had: because of the 2-rotor mast, how much taller is the heli? That could bring problems related to geting them aboard ships, or storing them in small hangars that fit today's copters...
    It's a fixed hub. The Kamov designs are much taller.

    Here's a mockup of the S-97 next to some people for scale:



    Here's a Ka-52 for comparison:

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    • #17
      Originally posted by citanon View Post
      It's a fixed hub. The Kamov designs are much taller.

      Here's a mockup of the S-97 next to some people for scale:

      Here's a Ka-52 for comparison:
      ooO! Much lower...

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      • #18
        She's ALIVE!



        They are not kidding about those rotor blades being "rigid".

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        • #19
          Reminds me of the flying car's design for some reason....

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          • #20
            Plastic and sort of flat nosed?

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            • #21
              [QUOTE=Operator;979996]The US Army is looking to eventually upgrade it's Blackhawk fleet and the Bell V280 Valor and Sikorsky/Boeing Defiant are the two competitors. With a quick look at the two, it seems like the V280 would be the more ideal choice. It's still early and little is known about the Defiant but I could see Bell getting the utility copter deal and the Sikorsky S-97 Raider receiving the attack helo deal.


              V280





              Bell unveils the V280 Valor Tilt Rotor Aircraft at AUSA 2014 | Defense Update:

              What happens if you lose an engine? In forward flight those look like big engines and very high wing loading and a v-tail. Other than a French trainer never saw a v tail twin,or for anti torque on a helicopter. I am sure they have answer, just curious to what it is?

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              • #22
                It's probably basically the same as an Osprey; there's a connection between the transmissions to keep both rotors going. If you're asking about flight characteristics, I still think it's going to be related to however the Osprey reacts.
                Last edited by Jimmy; 21 Feb 15,, 22:47.

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                • #23
                  Originally posted by Jimmy View Post
                  It's probably basically the same as an Osprey; there's a connection between the transmissions to keep both rotors going. If you're asking about flight characteristics, I still think it's going to be related to however the Osprey reacts.
                  I'm lazy, and should look this up, but on the tilt rotors you never feather, and pray the transmission never fails?

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                  • #24
                    That's my impression from chatting with an Osprey pilot on another message board I sometimes use...if I could remember who it was I could ask. Unfortunately...

                    But if the transmission fails on a normal helicopter you're also boned. Maybe you can survive through autorotation but does that still work "normally" on a twin rotor like a 46 or Chinook?

                    Helicopters make virtually zero sense to me. The more I learn the less I understand.

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