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| General RC Aircraft Discussion Discuss anything RC related |
Topic Review (Newest First)
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| 04-14-2011 12:34 PM | |
| Eganwp |
Re: Throttle return spring poll Not to flame anyone in this thread, but the reasoning of "the little spring will wear out the servo and/or cause servo binding" is a bit rediculous. A measly little 30oz micro servo can move that throttle arm with the weak little spring attached!!!! If some of you are that worried about it, I hope you're running over 1000oz of torque on every single surface of your 50-100cc+ birds as well... The return spring has many benefits as others have stated: 1. Reduces servo gear lash + gear train lifetime 2. Reduces pot "center" wear in the servo itself 2. Reduces vibration for a much more consistent idle 3. Reduces linkage wear, butterfly wear, pin wear & linkage end wear 4. Ever so lightly loads the servo for a more accurate idle return and consistent repeatability. 5. Is one more added safety kill if the throttle linkage ever broke. Yes, most of use opti-kills anyway. The negatives? 1. ~5-20% more throttle servo power mah used (which equates to almost nothing overall). That's literally the only negative I can think of. In fact, many of you (including myself on my 100cc) run the little "velco mod" on our GS planes to reduce centering vibration of certain servos (Ie. JR 8711's on rudders). In effect this is just another form of that mod but on the throttle, using a spring for a light loading rather than velcro. Egan |
| 04-12-2011 11:29 AM | |
| AbDriver |
Re: Throttle return spring poll I found that without the spring on the carb it was a lot more difficult to get it set up perfectly. It's not a direct arm on the carb like a nitro engine but 2 arms, one pulling on the other. I reduced the force of the spring and now it works nicely. I expected the servo to buzz but there is no buzzing whatsoever. I think I will try it with the spring initially after all. I will still have a Opto kill as well. Thanks for all the input abD |
| 04-11-2011 09:20 AM | |
| Myzee |
Re: Throttle return spring poll All my servo arms on the heli are aluminium except the throttle which is plastic. I've never had a servo arm break like that ever in the 30 years I have been into R/C. Strange |
| 04-10-2011 09:29 PM | |
| Nev |
Re: Throttle return spring poll Yikes ! Get yourself an optokil 
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| 04-10-2011 07:05 PM | |
| jfckelly |
Re: Throttle return spring poll I run the spring, and run the optokill, I figure, you have the bucks to fly gassers, you should be able to buy a decent throttle servo, having a consistent idle is a bonus too. Same guys that remove the throttle spring usually have tonnes of binding in their control surface hinging and linkage. To each their own I guess |
| 04-10-2011 06:47 PM | |
| Myzee |
Re: Throttle return spring poll How ironic is this!!!!!! Yesterday, flew my new Predator and guess what happened? The throttle servo arm broke right after I landed! Luckily I have a kill switch mounted on the frame but we still had to do a mad dash to find a stick long enough that I could get under the spinning mains to flick it down to the off position! NOT cool at all!  Really wishing that spring was on there now....... |
| 04-09-2011 08:11 PM | |
| Billpilotca |
Re: Throttle return spring poll As Jeff and many others have said, unclip the spring from the throttle arm and leave it in place. Easy and simple. |
| 04-08-2011 09:42 PM | |
| Guest |
Re: Throttle return spring poll Out of curiosity I wondered just how much resistance the spring would give. Even a cheap 3 dollar Hobby King indoor serve moves the arm with the spring. It would seem to me that there is less force on the servo from the spring than a deflected control surface at 60 or 70 mph. Vibration may be the biggest danger and a loose arrangement may in fact create more harmonics than a lightly loaded return spring. I undid the spring from the arm and let it unwind one turn and hooked it back up. It halved the spring pressure yet still had enough to close the throttle if the linkage disengaged. If you were to use a decent throttle servo I cannot see a problem leaving the spring on. As far as draining the battery pack prematurely I have had the spring loading the servo for over an hour and the 700 milliamp pack still registers a good charge. I have always left the spring on. I use an HS 425BB servo for throttle and never had one fail. If I were to do anything I think I might unwind the spring and hook it back up again. On another note over the years I have had more than one optical switch fail where I have just removed it from the system. Comes down to what works for you and what makes you feel comfortable. Dennis |
| 04-08-2011 08:39 PM | |
| Guest |
Re: Throttle return spring poll I had a T servo burn out on my GS Mustang during its maiden. Just flick a switch to activate the OPTO kill switch and land. Loose the spring. Trev |
| 04-08-2011 02:37 PM | |
| canadianf1pilot |
Re: Throttle return spring poll I just unhook the little spring and leave it there, behind the throttle arm (so worrys about butterfly vibrating) and I use a TX operated Optical Kill Switch for safety (but have never needed it). as for using the return spring for a fail safe, what do you use on a glow engine? Bill |
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