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Govenor or Rev Limiter?

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  • #16
    I have AR7100Rs with built in limiters in two of my helis and find they work fine, I am not a stick banger so I cannot say how they work under those conditions, I try to set the curves up so they are OK with the limiter not initiated and then raise the curves by a few percent so the limiter is working. I use the base plate mounted sensor and to date have had no problems.
    Rob
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    • #17
      Originally posted by trillian View Post
      I have a TJ on one of my Robbes and I think it's doing something but I need to really figure out how to set it properly.

      I've set a few TJ's up pm me if you want. I have one on my Fury 60, seems to work well although, it has a bit of throttle lag. i'm thinking of going back to curves on all my heli's.
      Furion 450, Razor 600E, Fury 55, , Stratus 90, Fury 90 Extreme, Spectra G
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      • #18
        Originally posted by mookiiee View Post
        I've set a few TJ's up pm me if you want. I have one on my Fury 60, seems to work well although, it has a bit of throttle lag. i'm thinking of going back to curves on all my heli's.

        This one was on a 2nd hand heli I got in December. It's a Throttle Jockey pro.

        All I have done is play around a bit with the ATV settings on the aux 2 switch and I can see that if I go below a certain point the green light goes off. But I really should read the manual and figure it out.

        It had been setup before and the heli came with the Spektrum RX but the original owner was using a JR X388S TX and I'm using a DX7.
        Kasama, Minicopter, Henseleit, JR, Shape, Beam
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        • #19
          It is agrued that a limiter will work better in 3D for the following reason;

          Limiter - You set a 100% curve and a headspeed at which not to exceed. This means the throttle is always trying to open fully and is been held back by the limiter. This means that your headspeed should remain constant and it just stops you over speeding.

          Govenor - A govenor has a target head speed and ads throttle when the head speed has decayed (by how much depends on the software) and therefore does not add throttle until the headspeed is already on the way down

          People would argue that the limiter is therefore more likely to keep the target headspeed when compared to a govenor and logic suggests this to be true, but I do wonder if we could actually tell the difference.........your call!!!

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          • #20
            Originally posted by darrens View Post
            It is agrued that a limiter will work better in 3D for the following reason;
            [...]
            Sounds very unlikely to me.
            Yes, it's th@ tw@ Scallyb@...

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            • #21
              Like I said, "it is argued"........."but I do wonder if we can tell the difference"

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              • #22
                Originally posted by darrens View Post
                Like I said, "it is argued"........."but I do wonder if we can tell the difference"
                Ok - there's little sense in the argument.

                What anyone sees in practice may be a different matter.
                Yes, it's th@ tw@ Scallyb@...

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                • #23
                  With the TJ pro it has two connectors, one that obviously goes to the throttle and one to Aux, I have just converted to 2.4 and have a Futaba setup using a 617 RX which has 7 channels, there no's more space for the Aux cable to plug in, does that mean I need an 8 channel RX ! which therefore won't work with my FF7 right?
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                  • #24
                    The idea that a 100% flat line throttle curve can damage your engine in the event of a magnet/sensor failure is frankly unlikely.

                    We have several (many) limiters at our club and they all run 100% flat lines on the throttle. Over the years, there have been several 'thrown' magnets and a few sensor failures, and it's been damn hard to actually tell the difference in flight. The reason being that when you're doing your 'hard' 3D, the engine is basically at constant full throttle anyway, so the limiter isn't really making much difference.

                    I've seen 50 and 90 size helis come into land with a limiter fitted and a magnet lost, and all that happens is it lands with a high head speed - usually a good sign that something is amiss. Never seen an engine damaged by this.

                    Should go in the myth busters thread!

                    A limiter will always have full throttle 'on demand' without having to calculate or predict the performance of the engine. Only way to go.
                    JR Vibe Fifty fb (YS56)

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                    • #25
                      Originally posted by Steve View Post
                      A limiter will always have full throttle 'on demand' without having to calculate or predict the performance of the engine. Only way to go.
                      I've heard many people say that a rev limiter is better than a governor but can someone actually give one decent reason why this is the case? What specifically is the difference between a 100% throttle curve with an electronic gizmo limiting the rpm and a regular v curve with an electronic gizmo adding/subtracting rpm??? I can't see any difference in real world functionality between the two? I could run a 100% throttle curve with my Align 'governor' if I wanted to and as far as I can tell it would do exactly the same job as a 'rev limiter'.

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                      • #26
                        darrens, I cant see there being any benefit to the limiter, its still got to do the same thing that the governor has to do before it opens the throttle/allows the throttle to open (not a lot of difference there ) and that thing is detect the drop in rpm, and in either case there will have to be a certain programmed in threshold for what constitutes a drop in rpm, not much, perhaps only 5 or 10 rpm, but in either case that would be too quick for a person to see.

                        The methodology is different, but I dont see how one can be much better than the other, and personally I would rather buy something like a revlock 20, not the 10, but at least the 20, or any other governor that you can tell it to act as a limiter, that way if you want to try gov vs limiter you dont have to buy again.

                        The other thing is buying a rev limiter seems a lot like buying half a governor to me.....
                        Last edited by Rotorhead; 03-06-2010, 03:22 AM.
                        Political Correctness is a doctrine fostered by a delusional, illogical, liberal minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.

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                        • #27
                          I don't know if in practice it is any better, but the theory does have some logic. That said, the limiter wasn't designed for 100% curve as we actually use it, it was designed to sit on top of a normal curve and just stop over speeding.
                          However, a govenor has to react to a drop in HS, so by the time it has decided to react the HS is already decaying and can decay further if under load before the govenor/engine can manage to catch back up. A limiter with an "ever opening" throttle may have caught the decay a little quicker I would think.
                          I'm not banging the drum for either, I don't think I'm good enough to notice the difference or need the better of the two, but wanted to answer the orignial question of "what is the difference".
                          I do in fact use a TJ RevMax which can be used in either gov or limit and I use it in limiter mode, but it is disabled in normal flight mode so I don't have to worry about magnet loss, I would just click out of idle up.

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                          • #28
                            Originally posted by Delta7 View Post
                            With the TJ pro it has two connectors, one that obviously goes to the throttle and one to Aux, I have just converted to 2.4 and have a Futaba setup using a 617 RX which has 7 channels, there no's more space for the Aux cable to plug in, does that mean I need an 8 channel RX ! which therefore won't work with my FF7 right?
                            7 channels should do it. I have a Spektrum AR7000 in the Hirobo with a CSM Revlock 10. There is an aux 1 and aux 2. Aux 1 is the pitch servo and aux 2 is the Revlock (which also connects to the throttle channel).

                            You must have a Voltspy or something connected to a channel because it shouldn't require more than 7.
                            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

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