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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › Tail rotor servor for Throttle ?
12-08-2011 04:01 PM  9 years ago
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taxus812

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Conecticut - USA

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Tail rotor servor for Throttle ?
Can you use a tail servo on the throttle ?

I was thinking that since i dont need torque on the throttle I may want to use a rudder servo there. perhaps the same type being used for rudder servo (boy that sounded weird)
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12-08-2011 04:10 PM  9 years ago
Heli 770

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USA.

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Tail servos are too fast and expensive to be using it for throttle.
Edit: All you need for speed is around .10-.20 and you're right about the torque.
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12-08-2011 06:25 PM  9 years ago
ticedoff8

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Morgan Hill, CA. USA

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I use a Align DS650 (tail rotor) servo on my Raptor 90.
OS .91 HZ with a Futaba GV-1 governor.
Is it necessary? No. Any decently fast servo will be fine.
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12-08-2011 07:54 PM  9 years ago
taxus812

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Conecticut - USA

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Thanks
I am putting it on a raptor 30 with a GV-1 as well. I will start to the hunt for a decent throttle servo now
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12-08-2011 09:45 PM  9 years ago
BarracudaHockey

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Jacksonville FL

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Waste of money putting a T/R servo on the throttle.

No matter how fast you yank that throttle arm back and forth, an internal combustion engine can only respond to throttle inputs so fast.
Andy
AMA 77227
http://www.jaxrc.com
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12-09-2011 02:26 AM  9 years ago
GMPheli

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An engine spinning 16k is taking a gulp of air 266 times per second. Logic dictates the sooner you open the barrel, the sooner the power will come on. Can you explain to me why this is not true? (Not trying to be a smart arse here, just curious)
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12-09-2011 02:50 AM  9 years ago
PC12DRVR

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USA

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Theres nothing wrong with putting a TR servo on the throttle. That being said, I would not buy one specifically for that purpose, but I have used one I had laying around and there is no disadvantage, it works great.

I used to prefer DS8231 precision servos for the throttle in my nitro days, a good balance of speed,torque and precision.

Dont assume people dont have money to waste
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12-09-2011 07:20 AM  9 years ago
brandon113

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bedford, texas

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Well ok you are right but a nitro engine doesn't respond that fast so a millisecond or 10 difference won't make that much difference. Because our engines are not injected, well guess some of them have pressure carbs, a fast throttle could actually not work as well as a smooth quick one....

Brandon
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12-09-2011 11:57 AM  9 years ago
taxus812

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Conecticut - USA

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So what I'm hearing is a futaba s128 or s3003 servo would do fine.

They have like a .24ms transit time, analog, plastic gears and works only on 4.8v.(Just kidding,Well kinda)

What about digital vs analog ? (all my other servos are digital). I don't need the holding power of a digital servo on throttle I imagine.

I'm picturing a standard analog or digital servo, decent transit time (let's say 15ms@6v), plastic gears.
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12-09-2011 12:04 PM  9 years ago
Heli 770

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USA.

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I like using the Hitec servos with Karbonite gears, you can run them at 6 volts.
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12-09-2011 01:28 PM  9 years ago
CX1

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Canada

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nothing wrong with using 1 there is no ill effects from use.
I use a 9257 and the revmax limiter loves it.
" Team Protoast "
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12-10-2011 07:04 AM  9 years ago
honda411

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Surprise, AZ USA

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DS620, and DS650 on two different helis. dont forget throttle return spring( chicken dance spring)
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12-10-2011 07:41 AM  9 years ago
littleman

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Pasadena, Ca

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I aim for my throttle servo to be at least as fast as my collective servo(s)
A.J.
Proud member of Teams MSH USA, Futaba, Scorpion, & Nick Maxwell Products
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12-10-2011 11:46 AM  9 years ago
taxus812

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Conecticut - USA

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Dont forget the throttle return spring.
I never herd of such a thing (seeing I only have like 5 months of experience there is a lot I haven't herd of). It sounds simple do you have a picture you can post ? (how big of a spring)
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12-10-2011 04:28 PM  9 years ago
brandon113

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bedford, texas

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throttle return sping is a great idea I have been flying for years and never put one on. Just too lazy I guess watched the funky chicken a bunch. Normally use what ever servo I have at the time. Never really had an issue with analogue servos. That said I do think governors do drive servos harder.....

Brandon
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12-10-2011 04:33 PM  9 years ago
Heli 770

rrProfessor

USA.

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taxus812
Throttle spring topic.
https://rc.runryder.com/t647756p1/
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12-11-2011 03:08 AM  9 years ago
taxus812

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Conecticut - USA

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Ok I'm crosseyed after reading that.

That said I'm still gonna grab one tomorrow.
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12-11-2011 07:09 AM  9 years ago
jadams

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East coast USA

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Absolutely nothing wrong with using a "tail " servo on throttle. I use older 9253/9254 servos on throttle. Great servo and used prices can't be beat. The main draw back is that you can't run it unregulated, a DS610 or BLS451 would also be good to use,
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12-11-2011 03:21 PM  9 years ago
GMPheli

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W. Bridgewater, MA USA

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For some reason some people seem to have a hard time grasping that the power required for a return spring is well within the specs of the servo. A scant 32 in/oz servo (which is right around where the Futaba tail servos are) can lift 2 lbs with the ball 1 in. out on the servo arm (at rated capacity). The other thing is these Futaba tail rotor servos move very easily when not under power (compared to many other servos). This is another thing that needs to be considered when using a throttle return spring. So you figure the pull of the spring would probably need to be around a few ounces max. The other thing the spring does is it tends to keep the servo loaded in one direction which helps to cut down on the amount the pushrod vibrates and reduces wear to both the servo and carb. The gasser guys have found out that if you remove the throttle return spring that is built into the Walbro carb (not strong enough to move a servo), The carb butterfly and body wear much quicker.
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12-11-2011 03:54 PM  9 years ago
brandon113

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bedford, texas

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I don't think the return spring is a problem for the servo at all my question is some servos gearing is such that you would have to have a pretty strong spring to move them. Some analogue servos use a weaker moter and use low gearing to compensate.

Brandon
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