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Old 04-06-2007, 09:03 AM   #1
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Default Servos 101 - what to look for?

Can anyone offer me some servo help. I have searched the net looking for the stats of my HPI SF-1 servos stock on the firestorm. I know they are not very good and am looking at other options but what I dont know is what they are exactly does anyone have their specs and also what kind of numbers should I be looking for?

also - I found an old servo from my plane days and wonder if it is even worth keeping it is a Command cs-61

torque 42oz speed .19sec but since I have nothing to compare these numbers to I dont really know what I am looking at. thanks
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Old 04-06-2007, 09:27 AM   #2
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The HPI SF-1 is just a rebadged Futaba S3003 (as far as I know) - http://www.futaba-rc.com/servos/servos.html - which is just a standard servo, of decent quality in my opinion but not super high performance.

For something like a Firestorm, they should actually be fine, it's not like they are overloaded in that application, but if you were looking to upgrade a medium-torque, high speed servo would be ideal. Approx 80oz of torque upwards and 0.15s transit time should be decent. Depends on your budget really.

From Futaba's range the S3010 is a good value high-torque servo. To get real speed you need to go quite high up their range. Personally speaking I wouldn't recommend Hitec servos but they do a variety of budget models with good specs.
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Old 04-06-2007, 10:22 AM   #3
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I have had very good luck with Futaba and JR servo's lately. I have a KO servo in my TC that has been there all season without any issues as well.

In my 1/8 scale buggy I am using the JR 9000S/T. I have the T on my steering (320in/oz torque at 0.15 sec on 6 volt). I can't remember how strong the S is but the speed is 0.06 seconds.

Some of the guys I race with just got the Futaba 9351's. I've been very happy with any of my Futaba's.
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Old 04-06-2007, 10:28 AM   #4
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thanks guys

so that old servo i have will make an ok spare?
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Old 04-06-2007, 10:32 AM   #5
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The speed is servo transit (turning) 60 degrees in seconds. Note whether this is 4.8V or 6.0V, they directly correlate

0.23 is slow, 0.15 is fast for offroad. 0.06 (JR 9000s) is blistering. I run a 0.08 speed Hitec Digital for touring car onroad and a 0.15 for offroad.

Offroad, torque is more important. 40 is low, 80 is borderline even for stadium truck, 120 is better, ok for 10th scale. 80 might be ok for a 10th scale buggy. Monster trucks need 200 or more, 320 is even better.

If you don't have enough torque, the vehicle will not steer or will not go the way you think when you're under load, bouncing around. Too slow and you may find it is not responsive enough for you.

Prices: think of it this way. There are about 3 price ranges to consider: $40-$50 bucks, $80-90 bucks and $120-150 bucks. $40-50 will get you a Hitec 645, not very fast but good torque about 100, will work for steering for 10th scale electric or nitro, not too expensive. $85 will get you a Hitec digital 6000 series (high speed 0.08, torque about 120) which is what I have in my touring car. $115 will get you a JR 9000s (0.06 speed) or 9000T (320 torque) which if I buy again will be what I get 9000s for onroad and 9000T for offroad.

I am most familiar with these, but check www.hitecrcd.com and check specs. I go there first because Hitec has cheapest prices, then compare other models. People here running offroad seem to either go cheap Hitec or better drives go JR and are not disappointed.

If you check web sites you will find recommendations for torque/speed for various applications. I can't remember where I saw a table for this, but it was probably Hitec or Futaba site, or maybe Tower Hobbies.

Hope this helps.
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Old 04-06-2007, 10:37 AM   #6
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regarding your spare servo,

My opinion 42 torque is not enough. Might function on a smooth track without much traction, but probably will die on you before too long. 0.19 is ok speed particularly if you are a new driver - slower = smoother at first until you learn to be smooth. For experienced drivers, some do like slow servos but I find my car "wanders" as I try to control faster than servo can follow. I can imagine some people are smooth enough the slower servo helps them, but I'm not one of those people.

On the other hand, any servo is better than nothing when one dies and you don't have a spare. But I would keep it for racing micros or something like that. That's what I use a 3001/3 type Futaba level servo for, running small scale stuff.
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Old 04-06-2007, 10:49 AM   #7
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thank you so much very helpful!
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Old 04-06-2007, 11:41 AM   #8
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hitech or jr analogs are real good for the price and for digital the futaba 9350 and 9351's are a great deal.
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Old 04-09-2007, 05:26 PM   #9
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jr 4800s/t are good servos.. analog with metal gears... the s is rated at .15 at 80ozin and they are around 85 dollars
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