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Old 10-31-2010, 11:11 AM   #1
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Default Truggy throttle servo

So the throttle servo in my Jammin X2 CRT went last race and sent my truggy careening across the track at full throttle. Luckily it flipped before it hit anything and the turn marshall was able to shut it down before my brand new S852 blew. Not sure what happened with it but now when I turn on the radio system the servo just sits there and does nothing for a second or two then goes all the way to full throttle and doesn't respond to any input from the radio. First question, anyone know what would make a servo do that?

Second, what sort of properties should I be looking for in a throttle servo? Should I be looking at the same high torque servos as I use for steering servos? I'm looking at a high torque servo with 208 oz/in and .13 transit time at 6V, will that be good enough?
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Old 10-31-2010, 11:20 AM   #2
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Make sure your new one is digital. It will help with failsafe. Also put a small rubber band or spring around the slide on your carb. This is just another failsafe. I prefer hitec but any reputable brand will do the job.
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Old 10-31-2010, 11:23 AM   #3
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Quote:
Originally Posted by kommando98 View Post
So the throttle servo in my Jammin X2 CRT went last race and sent my truggy careening across the track at full throttle. Luckily it flipped before it hit anything and the turn marshall was able to shut it down before my brand new S852 blew. Not sure what happened with it but now when I turn on the radio system the servo just sits there and does nothing for a second or two then goes all the way to full throttle and doesn't respond to any input from the radio. First question, anyone know what would make a servo do that?

Second, what sort of properties should I be looking for in a throttle servo? Should I be looking at the same high torque servos as I use for steering servos? I'm looking at a high torque servo with 208 oz/in and .13 transit time at 6V, will that be good enough?



the 208 oz with .13 sounds perfect maybe the brakes will be stronger
i use a throttle servo that has about 138 oz at 6v and i think i need more torque for the brakes for me=y truggy maybe not though.
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Old 10-31-2010, 11:47 AM   #4
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I would try and rebind my radio first and check over there .
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Old 10-31-2010, 01:09 PM   #5
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Also check that it's not your on/off switch. Direct plug the battery to the servo.
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Old 10-31-2010, 02:47 PM   #6
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Smile servo

Go with a new servo,yours has failed internally,the one you are looking at seems plenty strong, I would suggest Hitec they have an unbeatable warranty (2 years) I speak from experience
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Old 10-31-2010, 09:40 PM   #7
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Is your battery charged kommando98 ?
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Old 10-31-2010, 09:44 PM   #8
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Yup, it had a fresh charge on it. 6V, 1800 mAh pack that had run about 7 min of practice on it before it did this. The steering was still perfectly good too when I turn it on so something just went very wrong in the throttle servo. A return spring wouldnt even have fixed the issue because the servo just goes one direction and that's full throttle then it just stays there til I turn the radio off and manually move it back.
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Old 10-31-2010, 10:00 PM   #9
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Quote:
Originally Posted by kommando98 View Post
Yup, it had a fresh charge on it. 6V, 1800 mAh pack that had run about 7 min of practice on it before it did this. The steering was still perfectly good too when I turn it on so something just went very wrong in the throttle servo. A return spring wouldnt even have fixed the issue because the servo just goes one direction and that's full throttle then it just stays there til I turn the radio off and manually move it back.



Time for some New servos.
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Old 10-31-2010, 10:14 PM   #10
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Haha isn't it always time for something new in this hobby? I swear one of these days I'm actually gonna finish an entire race night without needing to buy something else before the next race night...or maybe not
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Old 10-31-2010, 10:37 PM   #11
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I would look at the Savox 1258. PM Me if you are interested.
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Old 11-01-2010, 10:34 AM   #12
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I've been running the Hitec 5625MG servo on my D8t for throttle, and it works flawlessly. You don't have to break the bank with an expensive servo on throttle, and if you look around including Ebay you can get them fairly cheaply. I go with Hitec because of their warranty...simply can't be beat! I've had their servos fail for the weirdest reasons and they've always either fixed them or replaced them. That's all I need to convince me...
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Old 11-01-2010, 11:13 AM   #13
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Originally Posted by rcgeezer View Post
I've been running the Hitec 5625MG servo on my D8t for throttle, and it works flawlessly. You don't have to break the bank with an expensive servo on throttle, and if you look around including Ebay you can get them fairly cheaply. I go with Hitec because of their warranty...simply can't be beat! I've had their servos fail for the weirdest reasons and they've always either fixed them or replaced them. That's all I need to convince me...
Awe come on breaking the bank can pay off on the track...

Check out what just arrived today>>>



@7.4V: 242.9 oz-in (17.6 Kg-cm) @ 0.06 S @ 60
@7.4V: 436.1 oz-in (31.6 Kg-cm) @ 0.11 S @ 60
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Old 11-01-2010, 11:39 AM   #14
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Quote:
Originally Posted by Frank L View Post
Awe come on breaking the bank can pay off on the track...

Check out what just arrived today>>>



@7.4V: 242.9 oz-in (17.6 Kg-cm) @ 0.06 S @ 60
@7.4V: 436.1 oz-in (31.6 Kg-cm) @ 0.11 S @ 60
FRANK,

those specs. dont look right.
which is 6.0v and which is 7.4v ??

Generally its: lower voltage/lower torque and slower transit times.
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Old 11-01-2010, 11:47 AM   #15
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Quote:
Originally Posted by guntek18 View Post
FRANK,

those specs. dont look right.
which is 6.0v and which is 7.4v ??

Generally its: lower voltage/lower torque and slower transit times.
Those are all #'s for running on lipo @ 7.4v
BTW they come in a composite case for a little less $$, but these are the full alum case version.

Heres the full story>>

KO30100 (speed servo)
Torque:
@6V: 200.1 oz-in (14.5 Kg-cm)
@7.4V: 242.9 oz-in (17.6 Kg-cm)
Speed:
@6V: 0.07 S @ 60
@7.4V: 0.06 S @ 60


KO30101 (torque servo)
Torque:

Torque:
@6V: 362.9 oz-in (26.3 Kg-cm)
@7.4V: 436.1 oz-in (31.6 Kg-cm)
Speed:
@6V: 0.13 S @ 60
@7.4V: 0.11 S @ 60
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