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  • #1

    Head speed ??

    This might be a daft question (I'm still learning to do figure eights) but when I put in a new battery the helicopter seems very twitchy and gradually becomes tamer mid-fight onwards. It's almost as if it's too responsive to input commands but softens as time progresses. I have beginner settings for the blade 400 programmed into my dx6i and have adjusted expo up to the mid thirties which helps.
    Do you think the head-speed is lower towards the end of the flight and is it something I can adjust/tune to make the thing easier to handle?
    Ta.
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  • #2
    Originally posted by mrben View Post
    This might be a daft question (I'm still learning to do figure eights) but when I put in a new battery the helicopter seems very twitchy and gradually becomes tamer mid-fight onwards. It's almost as if it's too responsive to input commands but softens as time progresses. I have beginner settings for the blade 400 programmed into my dx6i and have adjusted expo up to the mid thirties which helps. Do you think the head-speed is lower towards the end of the flight and is it something I can adjust/tune to make the thing easier to handle? Ta.
    Yes you do get a drop in headspeed as the lipo discharges in the order of 10 - 12% (about 200 - 300 rpm on a 450.

    There are 2 ways that I can think of to get around this.

    1. Run a governor
    2. Set two throttle curves on your radio (one slightly higher than the other) and switch from one the lower curve to the higher one half way through your flight (this is a bit of a problem with the DX6i though as you only have 1 idle up =).

    Of the two options running a governor is the more elegant solution but you need an esc that has an effective gov. This generally rules out Align ESCs and pretty much any of the cheaper units
    Last edited by bolders; 03-05-2012, 09:12 PM. Reason: No script removing spaces and paragraphs
    Velocity 50 (w/ Rossi R57) | Atom 500 | T Rex 450V2/Sport Hybrid

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    • #3
      Originally posted by bolders View Post
      Yes you do get a drop in headspeed as the lipo discharges in the order of 10 - 12% (about 200 - 300 rpm on a 450. There are 2 ways that I can think of to get around this. 1. Run a governor 2. Set two throttle curves on your radio (one slightly higher than the other) and switch from one the lower curve to the higher one half way through your flight (this is a bit of a problem with the DX6i though as you only have 1 idle up =). Of the two options running a governor is the more elegant solution but you need an esc that has an effective gov. This generally rules out Align ESCs and pretty much any of the cheaper units
      Doh I just ordered a new esc for my clone 450 that I'm gonna build and decided not to buy one with a governor.
      Another question (bear with me I'm learning about pitch and throttle curves). Can I flatten out the throttle curve to reduce the headspeed say by adjusting the dx6i durves downwards since I never use 100 percent throttle? Can I do the same with the pitch curve?
      Current curves are T 0, 42.5, 60, 80, 100 P 35, 42.5, 75, 100 . I take it I don't need to set the upper points to 100 and could knock it down a touch to 90 to make things less responsive?

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      • #4
        Originally posted by mrben View Post
        Doh I just ordered a new esc for my clone 450 that I'm gonna build and decided not to buy one with a governor. Another question (bear with me I'm learning about pitch and throttle curves). Can I flatten out the throttle curve to reduce the headspeed say by adjusting the dx6i durves downwards since I never use 100 percent throttle? Can I do the same with the pitch curve? Current curves are T 0, 42.5, 60, 80, 100 P 35, 42.5, 75, 100 . I take it I don't need to set the upper points to 100 and could knock it down a touch to 90 to make things less responsive?
        Yes you could but personally I would be more inclined to reduce my total pitch range using swash mix (PITC option) and keeping the pitch curve as is.

        I also prefer to use a flat line throttle curve so for example you could have
        T 0, 60, 90, 90, 90
        P 40, 42.5, 50, 75, 100

        If you want a higher or lower headspeed change the 90s to a higher or lower number but keep all the same (minimum value of approx 80 - if you want a lower speed consider changing the pinion) If your ESC has a good soft start then you can change the 60 on the throttle curve to a 90 as well.
        Last edited by bolders; 03-05-2012, 09:09 PM.
        Velocity 50 (w/ Rossi R57) | Atom 500 | T Rex 450V2/Sport Hybrid

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        • #5
          Thanks Bolders. I've just been messing about with the curves and tweaking the throttle helps. I didn't realise that the pitch curve only refers to the change of pitch in respect to throttle..

          I will try a flat throttle curve tomorrow. I think what I need is better resolution on the cyclic also. I take it reducing the total pitch range will do this (using swatch settings). Anyroad I'll google it. Steep learning curve this.
          Cheers

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          • #6
            Originally posted by mrben View Post
            Thanks Bolders. I've just been messing about with the curves and tweaking the throttle helps. I didn't realise that the pitch curve only refers to the change of pitch in respect to throttle..

            I will try a flat throttle curve tomorrow. I think what I need is better resolution on the cyclic also. I take it reducing the total pitch range will do this (using swatch settings). Anyroad I'll google it. Steep learning curve this.
            Cheers
            No you wont get better resolution by adjusting either pitch curve or swash mix. The only way to easily change resolution is to shorten your servo arms. Swash mix and pitch curves only adjust the amount of travel you can get from the servo. There is no change in the mechanical gain of the system.

            "I didn't realise that the pitch curve only refers to the change of pitch in respect to throttle"
            Im not sure what you mean by this. Do you mean the throttle stick.
            Velocity 50 (w/ Rossi R57) | Atom 500 | T Rex 450V2/Sport Hybrid

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            • #7
              Originally posted by bolders View Post
              No you wont get better resolution by adjusting either pitch curve or swash mix. The only way to easily change resolution is to shorten your servo arms. Swash mix and pitch curves only adjust the amount of travel you can get from the servo. There is no change in the mechanical gain of the system.

              "I didn't realise that the pitch curve only refers to the change of pitch in respect to throttle"
              Im not sure what you mean by this. Do you mean the throttle stick.
              What I meant is the pitch curve only changes the pitch of the blades as the throttle moves through it's range.

              Can I lower the total pitch range using the Dx6i? Is that what you mean by the swash mix pitch setting and will this make right stick less sensitive?
              Sorry to be a pain.

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              • #8
                Originally posted by mrben View Post
                What I meant is the pitch curve only changes the pitch of the blades as the throttle moves through it's range.

                Can I lower the total pitch range using the Dx6i? Is that what you mean by the swash mix pitch setting and will this make right stick less sensitive?
                Sorry to be a pain.

                Yes the pitch and throttle are independent from each other but they are both tied to the throttle stick. L on the pitch and throttle curves determines the pitch and throttle value at low stick, H determines the values at high stick and points 2, 3, & 4 on the curves determine the values when the throttle stick is at points equally spaced between Low and High positions.

                Yes you can lower the total pitch range on teh DX6i using the PITC value in the swash mix menu. This will make the pitch less sensitive. Most pilots use a mode 2 radio where the throttle stick is on the left hand side - if you are also on mode 2 this will have no effect on the sensitivity of your right stick (it will if you are using mode 1 though).

                Assuming you are mode 2 the right stick is your elevator and aileron. The sensitivity of this can be adjusted using the AILE and ELEV options in your swash mix or it can also be achieved using DR & EXPO menu (it is best to keep the AILE and ELEV values the same
                Velocity 50 (w/ Rossi R57) | Atom 500 | T Rex 450V2/Sport Hybrid

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                • #9
                  Thanks again. That really helps. Yes I use mode 2 and yes I'm trying to reduce the sensitivity of the right stick. I already messed around with expo settings which helped.
                  I say thisDay 1 Part 2 - Controls & Setup - YouTube video and the guy flicks a switch on his tx giving him beginner settings (at 7:30) . Is this something I can do on the Dx6i I know flicking the gear switch changes the pitch/throttle curves but can it also be set to do the same to AILE and ELEV?
                  Thanks again.

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                  • #10
                    He is using dual rates to reduce the overall servo throws. Page 46 and 62 or the DX6i manual.

                    http://www.spektrumrc.com/prodinfo/f...anual_dx6i.pdf

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                    • #11
                      Originally posted by Biffa View Post
                      He is using dual rates to reduce the overall servo throws. Page 46 and 62 or the DX6i manual.

                      http://www.spektrumrc.com/prodinfo/f...anual_dx6i.pdf
                      Sorted now thanks. I just used the dual rate settings and reduced the travel a bit. Loads easier to fly. Thanks all.

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