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  • Raptor 30 V2 Tail Problem

    Hi,

    Thought i would post here as well as its raptor specific.

    I have a raptor v2 with a Spektrum DS821 on the tail, Gaz-126 gyro - GY401 clone

    Luminous Green blades not sure what make.

    This is the problem

    The model flys brilliantly and tail holds well in general however the problem is when im coming to land and the heli drops when i increase throttle/collective to catch the model it swings severly 90 degrees to the left which is obviously not good. I have always flown in rate mode and never had this problem when the gyro was in my Hawk model.

    Are there any suggestions that i could try??

    P.s When the heli is in HH the model does not swing on punch outs but i prefer to fly in rate mode.

    Is it purely that i need to add revo mix or is there another common problem.

    Thanks,

    Jonny

  • #2
    Try upping the gain for rate mode.( if you have two values one for Hh and one for rate)
    Also it depends on your head speed, The rapppy 30 has a non driven tail. If your head speed is low maybe you are losing tail authority ?

    Why not land in HH?

    Simon
    ​SWRCH , Oh.. And a Helix 700 Gasser, Hv with SK540.....with SAB HPS head.

    Comment


    • #3
      How does this look

      Pitch cure -4,5.5,9 - 18,38,55,75,94

      Throttle curve

      20,40,50,60,100

      this will be better transitioning on throttle to what i have at the moment no as bigger steps (smoother)

      Cheers

      Comment


      • #4
        Originally posted by jwmachon View Post
        How does this look

        Pitch cure -4,5.5,9 - 18,38,55,75,94

        Throttle curve

        20,40,50,60,100

        this will be better transitioning on throttle to what i have at the moment no as bigger steps (smoother)

        Cheers
        So with those curves you're hovering just over 50% throttle at 6 deg. As you're coming in if you have to 'catch' it by increaseing the pitch suddenly you could be adding alot of throttle in one go and the extra torque is just to much for the gyro to cope with. You'll need to experiment but I would try and get your throttle curve a little flatter in the middle at the hovering point that way your not introducing such large throttle changes as your hovering / landing.

        Alternatively you could use a governor....

        HTH
        Martyn

        Trex 600N, OS Hyper, MP5, DS610, GP750, DS650.

        Trex 500, DS510, GP750, DS620.

        Comment


        • #5
          Many thanks guys, so u think flatten the curve so based on what i wrote how could i flatten it a bit, will my curve give good headspeed tho

          Cheers guys greatly appreciated also does my pitch curve look ok i think this as been my problem all along

          Comment


          • #6
            Originally posted by jwmachon View Post
            Many thanks guys, so u think flatten the curve so based on what i wrote how could i flatten it a bit, will my curve give good headspeed tho
            Yeah I think it would probably be good having it a bit higher at the point slightly below and up through mid stick with the goal of getting the headspeed back up before the pitch really kicks in.

            I know exactly what you mean on the Raptor 30 where you have to anticipate with the throttle / pitch in a descent and now that I'm thinking about it this is probably something I should alter slightly on mine (bringing up the throttle a bit rather than having it quite so linear). As I am not running a gov on mine either at present.

            I haven't flown the 30 since late summer and I am a bit spoiled to the power of the .50 engines but I am actually keen to fly the 30 again soon.
            Kasama, Minicopter, Henseleit, JR, Shape, Beam
            Robbe, RMJ Raptor gasser, powered by
            Spartan, Spirit, BeastX, Kontronik, CY Total-G, DX8

            member of Epsom Downs and Bloobird clubs
            Proud recipient of 7 EGS! and a platinum star

            Comment


            • #7
              It's not possible to predict your head speed as there are so many variables but I would say with your settings it would be a little on the low side.

              Maybe go for a normal throttle curve of

              0, 50, 65, 75, 100.

              and an idle up throttle curve of

              100, 75, 65, 75, 100.

              It's still the same kind of shape as before but will give greater head speed from mid to 3/4 stick. It may just be on your current settings that the head speed it dropping too much and you're losing some control because of it as you reduce throttle and pitch when landing.

              It might be an idea to change the mid point of your pitch curve as well as you're low to mid stick gives a range of 9.5 deg and then only 3.5 deg from mid to high stick. I take it you like hovering at mid stick with those settings. I would be temped to try and make the pitch curve a little more linear to so dont have huge pitch inputs at any given point in the range.

              Personally I run at zero pitch mid stick and that way I know high stick is +ve pitch and low stick is -ve pitch and I hover at just under 3/4 stick pos'n.

              Maybe reduce your mid stick pitch to 3 deg and that makes the pitch curve a little less aggressive and your not loading up the head so much with your pitch inputs. The only thing by doing that is you'll alter the hover point on your TX but with the extra head speed that you'll have by hovering between mid and 3/4 stick, 70% throttle from your 55%, it will reduce the amount the hover point moves.

              You might find the heli a little more responcive to cyclic inputs with the extra head speed but you could always ad some expo to counteract this effect.

              There is no right or wrong way to set up your heli, it's you're personal preference at the end of the day and there is no substitute for actually going to fly and start experimenting with pitch and throttle curves. Set it up and fly it, if you don't like it change it and fly again. It takes time but ultimately it's quite rewarding and it'll teach you alot.

              HTH
              Martyn

              Trex 600N, OS Hyper, MP5, DS610, GP750, DS650.

              Trex 500, DS510, GP750, DS620.

              Comment


              • #8
                Can I ask why you prefer rate mode? There is very few pilots use it now and HH makes life easier as you dont really need to worry about the tail swinging out like that!
                Del
                Outrage Velocity 50 N2 FBL, OS55 Powered -Built and almost ready to fly

                Climb-Out

                3D Scotland

                Proud owner of 2 EGS

                Comment


                • #9
                  im going to learn to fly in hh mode but want this sorted first mate. So farmergiles u say leave my pitch curve as it is and reduce my pitch range to -4 +3 +9 would that look better.

                  So change pitch and leave throttle curve cos thats quite flat

                  Thanks

                  Comment


                  • #10
                    or i could have -3,+3,9 this would give 50% either side

                    Comment


                    • #11
                      Originally posted by jwmachon View Post
                      im going to learn to fly in hh mode but want this sorted first mate. So farmergiles u say leave my pitch curve as it is and reduce my pitch range to -4 +3 +9 would that look better.




                      So change pitch and leave throttle curve cos thats quite flat


                      Thanks
                      Leave your total pitch range as it is, EI -4 to +9, that's fine for flying circuits and hovering around but change the mid point in your TX to make the pitch +3 degrees from +5.5 as you have now. This will flatten out your pitch curve a little so pitch inputs are more linear

                      As for throttle I would increase it as sugested above .



                      So pitch curve becomes 4-, +3, +9.

                      Actually do you inhibit the 2nd and 4th position or do you only have a 3 point curve in your TX? if you have a 5 point curve then jsut split the difference on the above so :

                      -4 0 +3 +6 +9 degrees
                      NB : these figures are degrees of pitch on the blades of your heli so you will need to work out the % value you need to enter in your TX to achieve these settings. Just wanted to be totally clear on that...

                      Throttle curve

                      normal throttle curve of

                      0, 50, 65, 75, 100.

                      and an idle up throttle curve of

                      100, 75, 65, 75, 100.
                      Martyn

                      Trex 600N, OS Hyper, MP5, DS610, GP750, DS650.

                      Trex 500, DS510, GP750, DS620.

                      Comment


                      • #12
                        thanks will give that a try and see if it still kicks out many thanks mate, the problem is where i fly there are 2 heli flyers and im 1 of them, i have learnt myself from hover to full circuits but never cracked curves. No crashes yet tho lmao

                        Cheers guys

                        Comment


                        • #13
                          This 0, 50, 65, 75, 100 throttle curve is this general for 30 size helis

                          Thanks,

                          Jonny

                          Comment


                          • #14
                            Originally posted by jwmachon View Post
                            This 0, 50, 65, 75, 100 throttle curve is this general for 30 size helis

                            Thanks,

                            Jonny

                            I fly a 30 and a 50 raptor and find that the above throttle curve suits the 30 very well, I like a little more head speed with the 30 around point 2 and 3 as it has not as much power as the 50 to recover from a unintentialy quick decent.
                            Hope this makes sence.
                            All the best STEVE.


                            Raptor 50 Kasama head and tail gearbox, OS Hyper, AR 9000, align regulator with glow, csm 560 micro, DS620 on tail.
                            Raptor 50 csm 560 AR 7000
                            T-rex 450, Aser Lab D12 MG all round CSM 420
                            DX7 Phoenix
                            Proud owner of 1 Eddie Gold Star sigpic

                            Comment


                            • #15
                              These throttle curves will give you base line to work from, you might have to tweek them to suit your model. The throttle curve on my raptor is pretty much the same as Martin has posted in both normal and Idle up with maybe one or 2 points different to suit my model and flying style.
                              Del
                              Outrage Velocity 50 N2 FBL, OS55 Powered -Built and almost ready to fly

                              Climb-Out

                              3D Scotland

                              Proud owner of 2 EGS

                              Comment

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