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Old 01-27-2005, 06:20 PM   #16
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BMS-620 High-Torque Standard Size Servo JR/Hitec
Weight: 45 Grams / 1.58 oz, Torque: 126 oz.in, Speed: 0.15 sec./60 at 4.8V
$15.75 Add Item To Cart
BMS-621 High-Speed Standard Size Servo JR/Hitec
Weight: 41 grams / 1.45 oz., Torque: 89 oz.in, Speed: 0.13 sec./60 at 4.8V
$16.49 Add Item To Cart
BMS-631 Super Fast Standard Size Servo JR/Hitec
Weight: 43 grams / 1.52 oz., Torque: 69 oz.in, Speed: 0.10 sec./60 at 4.8V
$19.75 Add Item To Cart
BMS-705 High-Torque Low Profile Servo JR/Hitec
Weight: 28 Grams / 0.99 oz, Torque: 83 oz.in, Speed: 0.18 sec./60 at 4.8V
$18.95 Add Item To Cart
BMS-706 High-Torque Low Profile Servo JR/Hitec
Weight: 26 Grams / 0.92 oz, Torque: 65 oz.in, Speed: 0.13 sec./60 at 4.8V
$19.95 Add Item To Cart
BMS-620MG High-Torque Standard Size Servo JR/Hitec
Weight: 51 grams / 1.80 oz., Torque: 126 oz.in, Speed: 0.15 sec./60 at 4.8V
$21.49 Add Item To Cart
BMS-621MG High-Speed Standard Size Servo JR/Hitec
Weight: 47 grams / 1.66 oz, Torque: 89 oz.in, Speed: 0.13 sec./60 at 4.8V
$21.75

www.balsapr.com

their numbers get better @6.0v
BUT like mentioned before, you get what you pay for!!!
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Old 01-27-2005, 07:38 PM   #17
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seems maybe i can find the futabo s9550 for around 75 bucks as said above, maybe i'll just spend the extra $25 bucks.

Can some explain to me the advantages of having a servo that's
A:digital
B:coreless
?

Couple of guys at our track had serious problems with glitching because of the having digital servos on their CF chasis, enough that they had to remove them to fix the problem, isolated incident or common?
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Old 01-29-2005, 03:44 AM   #18
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honestly, its tough to beat the airtronics 94357. Its not digital, its not cheap, but its rediculously fast, massive torque and rebuildable. I really think having a servo with a transit sub .11 is worth while in a sedan, but thats just my 2 cents.
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Old 01-29-2005, 04:44 AM   #19
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I've had a few hi-tec servos in my time and they do not center well, even the digital ones. I would suggest a futaba they make a fine servo. IMO
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Old 01-29-2005, 05:30 AM   #20
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Digital servo explanation

Coreless: It's a kind of electric motor, which is smooth and fast.

The first thing, I would look for choosing a servo is a wellknown brand. Futaba, KO Propo, JR etc. NOT Hitec.

Second: Ball bearings and metal gears, to prevent decresing precision and centering.

Third: Speed. I would try to get down to 0,1 sec / 60 degrees. Torque is usually good at these kinds of speed.

Fourth: Digital.

Take note, that some brands only spec the servos at 45 degrees !

Also, check your ESC: If the BEC only delivers 5 volt, you'll loose 25% of your servo speed. If your ESC only deliever 5 volt, look for a servo with a 7,2 volt FET wire. Or upgrade your ESC.

If you can find a KO Propo PS 713, you'll have a fast quality servo for a reasonably price (close to your budget). But it's not in production anymore

Or try finding a KO PS-2113. Ultra fast, but I think it's only avaible in europe.

If you cant find these, the Futaba S3401 is probably what I would go with - fits your budget.

But personally, I would save up some more for the Futaba S9405

The budget thing, is also about buying the right thing first time, so you dont have to upgrade. And a good servo will last many cars and for a long time. Buy cheap, and cry a lot . Spend more, and only cry once
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Old 01-31-2005, 02:22 AM   #21
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Notice that some manufacturers rate their servos at 6 or even 7.2 volts, others at 4.8 volts. Same servo has higher torque and speed numbers at 6 volts than 4.8 volts. I myself use Hitec 605 BB servos in my basher cars. They're not as good as my top of the line Futaba servos but at 1/4 the price I really don't care, unless I'm racing of course.
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Old 01-31-2005, 04:09 AM   #22
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Quote:
Originally posted by Speedo
Don't buy Hitec servos, they have a lot of trouble centering.
Couldn't agree more!

I think a servo that can center is one of the most important things.

Speed and torque are nothing in a car that won't go straight.
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