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Old 10-30-2008, 08:06 PM   #1
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Default Need some advise with servos

Im looking for some advise as to what torque / speed servos to get for 200mm car.

specifically what torque / speed would be best for:

1)steering

2)throttle / brake

It seems to me, the smaller cars would need more speed in the steering than torque. But IDK

Also, what is the benefit of spending more money on a throttle servo?

What would be the very best choices?

what do you have?

any insight is VERY much appreciated, This noob is still learning.

Regards,
Jon
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Old 10-30-2008, 10:46 PM   #2
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I'll start... My opinion.

1. Steering. 86 to 125 oz. Speed from .09 to .06

2. Breaks/throttle 125 oz. Speed from .16 to .10

A good servo will cost more money. I feel you get what you pay for in most cases with the purchase of a servo. A good throttle/break servo will last. Most of us blow throttle/break servos first. A good one will make a few seasons with relaibility and accuracy. Personally, I spend more money on my steering than my throttle/break.

The best choices in steering and throttle/break servos are...
Airtronics, JR, Futaba, & Ko propo
My steering servos for almost all of my cars and truggy are Airtronics 94357, 94358 and 94772. I run from 125 oz to 200 oz. depending on application.

Some of my friends run the JR 9000 series.

Throttle/break, I use digital servos by High Tec. I don't remember the number.
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Old 10-30-2008, 11:31 PM   #3
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Last edited by Scott Fisher; 10-31-2008 at 01:53 PM.
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Old 10-30-2008, 11:38 PM   #4
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I have been using the Futaba 945x series of servos for steering for a few years now. I started with the 9450, went to the 9451 and now use the 9452.

On the throttle, I use the 955x series. Currently use the 9550 in the sedan and have 9551's waiting as spares and for the 1/8th scale.

I highly advise if you want to use a digital servo for throttle/brake use a Futaba. If not use an analog servo. I have seen way too many other brands of digitals pop on the throttle. That is just my experience.

My advice, is to get a pair of 9452 servos from Tower Hobbies. They are $85 each. You get a discount of $6 for buying 2 of them, then use the coupon code from their home page and that will give you an additional $20 off. So, if you buy a pair of them they actually cost $72 each.

The only other idea is if you want a backup, then get the 9551 servo. They give a quantity discount if you purchase 3 of them. Doing this would give you a matched backup servo.
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Old 10-31-2008, 12:18 AM   #5
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Airtronics 361 and 362 have worked flawlessly for me for over a year. They are both being replaced with digital versions, which I don't know the model number for. If they are anything like the 361/62, they should be very good.
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Old 10-31-2008, 08:30 AM   #6
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The 955x series are low profile.. Do these fit better for a throttle application?

also, are you saying analog tend to wear better for throttle application?

this qustion is directed at scott..

Many, many thanks, Jon
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Old 10-31-2008, 10:00 AM   #7
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Digital servos do not like having constant torque applied to them. If you run a digital servo in the throttle area and run with any drag brake a digital servo won't last long.
You can use a digital servo for throttle but I would highly recommend re-programming it to act somewhat like an analog servo. An analog servo can withstand better with a constant torque applied. It's just not as accurate and fast as an digital servo.

Pass you soon...
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Old 10-31-2008, 10:13 AM   #8
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Can't go wrong with the Futabas. Around here, the 9452 is about the de facto standard on the cars, both throttle and brake. Smooth, reliable and had all the speed and torque you need.
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Old 10-31-2008, 10:25 AM   #9
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Quote:
Originally Posted by jman37 View Post
The 955x series are low profile.. Do these fit better for a throttle application?

also, are you saying analog tend to wear better for throttle application?

this qustion is directed at scott..

Many, many thanks, Jon

Regarding the low profile servos. They don't fit better, standard sized servos fit just fine. The 955x series is a bit smaller and lighter with basically the same performance. If you look at the dimensions you will find that the 9452 is actually sized between the "standard" size and the 955x series

Regarding the analog/digital for throttle, go ahead and read what lil-bump read. Bottom line is while there have been lots of improvements to digitals, my experience is that if I were to want a digital throttle servo I would only use futaba digitals for throttle/brake. If not I would use analog serovs. If using analog, then there are plenty of good choices from the other major servo manufacturers.
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Old 10-31-2008, 11:01 AM   #10
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when i was using a front oneway in my mtx4r, i needed much less brake power, so i was good with futaba s3151 and futaba s3050 for throttle.
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Old 10-31-2008, 11:08 AM   #11
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Thanks, great information everyone. I went ahead and ordered a pair of 9452 servos from tower (thanks scott for savin me 26 bucks!). Im not sure if im going to end up using the drag brake idea or not, just have to see. But anyway, I feel confident I made a good choice! thanks to you guys!!!

Jon
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Old 10-31-2008, 11:46 AM   #12
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Quote:
Originally Posted by jman37 View Post
Thanks, great information everyone. I went ahead and ordered a pair of 9452 servos from tower (thanks scott for savin me 26 bucks!). Im not sure if im going to end up using the drag brake idea or not, just have to see. But anyway, I feel confident I made a good choice! thanks to you guys!!!

Jon
Excellent choice. Not only do they perform great but last longer then any others I have tried.
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Old 10-31-2008, 12:26 PM   #13
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Quote:
Originally Posted by jman37 View Post
Thanks, great information everyone. I went ahead and ordered a pair of 9452 servos from tower (thanks scott for savin me 26 bucks!). Im not sure if im going to end up using the drag brake idea or not, just have to see. But anyway, I feel confident I made a good choice! thanks to you guys!!!

Jon

GREAT choice!!!!! and tower is a winner with the discounts

have fun an enjoy you new investment

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Old 10-31-2008, 01:21 PM   #14
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You won't regret it
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Old 10-31-2008, 04:08 PM   #15
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Yup.. Tuesday I get my NT1, my two 9452's, and my DX3R!!!!

and the best part is..


ITS MY DAY OFF!!!!!!
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