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Old 06-28-2010, 11:30 PM   #1
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Default Heavy duty Hi torque servo

So, I think playin around on the carpet and my new Swamp Dawg rubber on my AX10 killed my Futaba servo. I have a Novak Rooster ESC and a two channel pistol grip. It came with a S3003 servo, which, apparently isn't a high end servo. Any recommendations on a good quality servo that will plug right into the Futaba receiver ?
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Old 06-28-2010, 11:38 PM   #2
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all depends on what your willing to spend. for around $30 you can get a hitec 645mg. itll get the job done and good value for the dollar. if your willing to spend over the $100 mark go for something like a hitec 7950, its one of the strongest servos you can get
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Old 06-28-2010, 11:44 PM   #3
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Hmmm.. don't care about $$, want something that I don't have to keep buying over and over. I want one so strong, if my tire is between a rock and a hard space, it'll snap that link right in half! haha just kiddin.. yeah just something solid, I think my broken servo must have plastic gears, i can hear them snapping around inside..
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Old 06-29-2010, 12:58 AM   #4
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go with a hitec 7950 then, 486oz/in at 7.4 volts. you can run the thing directly off a 2s lipo.
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Old 06-29-2010, 01:04 AM   #5
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Hmm.. don't have Lipo's.. using just a plain 3000 mah, 6 cell 7.2, with tamiya connectors. So... if I have too powerful of a servo, it'll screw with my ESC right? It's a Novak Rooster with the fifty five motor
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Old 06-29-2010, 02:10 AM   #6
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I run a Novak Goat 3S ESC, 2 Novak 55t motors, powered by a 2200MHA/11.1v 3 cell lipo battery pack, the Hitech HS-7955TG works great for me. About 18KG of torque the way it's set up, it's done eveything i've thrown at it and never broken.

Wasn't cheap, but i went with the buy once and buy well approach rather than keeping buying low end stuff.
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Old 06-29-2010, 10:37 AM   #7
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Quote:
Originally Posted by JSinAlaska View Post
So... if I have too powerful of a servo, it'll screw with my ESC right? It's a Novak Rooster with the fifty five motor
Well, it can suck power from the ESC.....which has a built in BEC (battery eliminator circuit) robbing it from the motor....or vice versa.

When you step up to a high torque servo, it's best to add an External BEC (like the Castle Creations unit) into your system. It draws power directly from the battery...not from the ESC. Also, with that unit, you can (if you also purchase the Castle Link) adjust the output settings on the unit (which will help you get maximum torque from those servos that can handle higher voltage). If you purchase the CC BEC directly from Holmes Hobbies, you can request that the come pre-programmed for a certain voltage...which would save you from needing the Castle Link.

Last edited by JeremyH; 06-29-2010 at 10:39 AM.
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Old 06-29-2010, 12:10 PM   #8
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Quote:
Originally Posted by Sharkey View Post
go with a hitec 7950 then, 486oz/in at 7.4 volts. you can run the thing directly off a 2s lipo.
Dang that is one strong servo! Probably able to move a small kid outta the way!
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Old 06-29-2010, 12:25 PM   #9
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Originally Posted by el_Fernando View Post
Dang that is one strong servo! Probably able to move a small kid outta the way!
Haha....the 7980 provides 611 oz-in of torque at 7.4V....
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Old 06-29-2010, 01:23 PM   #10
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Cool thanks! i'll look into an external BEC and hit the hobby store tomorrow for a new servo.
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Old 06-30-2010, 04:58 PM   #11
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http://www.hobbypeople.net/gallery/474380.asp
It'll go on sale Sunday for $99.99.
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Old 06-30-2010, 05:08 PM   #12
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Originally Posted by noogles View Post
http://www.hobbypeople.net/gallery/474380.asp
It'll go on sale Sunday for $99.99.
Woooo....can you tell me if I'll win the lottery as well?
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Old 06-30-2010, 05:34 PM   #13
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Quote:
Originally Posted by JeremyH View Post
Woooo....can you tell me if I'll win the lottery as well?
Yes you will.

















Just kidding. I don't know.








Or am I...?
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Old 06-30-2010, 05:42 PM   #14
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Haha....just kidding.

So, do you work for hobbypeople? How do you know those will go on sale?
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Old 06-30-2010, 06:20 PM   #15
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Quote:
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Haha....just kidding.

So, do you work for hobbypeople? How do you know those will go on sale?

Just passing some info off another forum.
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Old 06-30-2010, 10:54 PM   #16
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Cool WARNING: Biased Reply!!!

HS-7980TH Mega Torque HV Coreless Titanium Gear Servo

37980S

Hitec's strongest servo period, the "Monster Torque" HS-7980TH is designed to operate on a two cell LiPo Pack. Featuring our newest high resolution "G2.5" 12 bit generation programmable digital circuit and our indestructible Titanium gears, The HS-7980TH has the performance and durability you've come to expect from a Hitec servo. Other features in the HS-7980TH include a 7.4V optimized coreless motor, integrated heat sink case, and a top case with two hardened steel gear pins supported by axial brass bushing.



Applications for the HS-7980TH include high performance Giant Scale Aircraft, Truggies and Buggies, Fast Power boats, the largest aircraft, monster trucks or anywhere else you can use 600+ inch ounces of torque.
Features
  • G2.5 12 bit Digital Programmable Circuit
  • Titanium Gear Train (MK first gear)
  • Ultra Performance Coreless Motor
  • Integrated Heatsink Case
  • ( 8 ) O-Rings for Water/Dust/Fuel protection
  • Dual Ball Bearing Supported Output Shaft
  • 10% larger than a HS-7955TG
Programmable Features Include:
- Dead Band Width
- Direction of Rotation
- Speed of Rotation (slower)
- End Points
- Neutral Points
- Fail Safe On/Off
- Fail Safe Point
- Resolution* (default is high resolution)
- Overload Protection* (default is off)
*These features are only programmable with the HFP-20, HPP-20 or HPP-21 programmers.

Specifications


Motor Type:Coreless
Bearing Type: Dual Ball Bearing
Speed (6.0V/7.4V):0.20 / 0.17
Torque oz./in. (6.0V/7.4V):500 / 611Torque kg./cm. (6.0V/7.4V):38.0 / 46.0
Size in Inches:1.72 x 0.88 x 1.57
Weight oz.:2.70
Size in Millimeters:43.69 x 22.35 x 39.88
Weight g.:76.54

Last edited by PaloAltoK5; 06-30-2010 at 10:57 PM.
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Old 07-01-2010, 12:35 AM   #17
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Yeah i picked up a 7955TG at my local hobby store. I'll see how it works, but so far so good. It seems to turn well, even on carpet. Picked up some new wheels, weights and an aluminum servo horn. Once my new Sting chassis shows up, my axle battery plate and a few other stuff from the internet I ordered, it almost won't be stock anymore!
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Old 07-01-2010, 01:00 AM   #18
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Quote:
Originally Posted by JSinAlaska View Post
Yeah i picked up a 7955TG at my local hobby store. I'll see how it works, but so far so good. It seems to turn well, even on carpet. Picked up some new wheels, weights and an aluminum servo horn. Once my new Sting chassis shows up, my axle battery plate and a few other stuff from the internet I ordered, it almost won't be stock anymore!
As soon as you can, get the overload protection on the servo, set it to 10%, this will ensure that you don't burn up the servo in hard binds. Your LHS should have a programmer.
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Old 07-01-2010, 01:03 AM   #19
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this one is definately worth a try for the money i've had mine for over a month now and no probs more than enough torque @ 6v although can't wait for my castle BEC to crank it up to 7.2v its a Turnigy HV-767 Digital corless titanium gear, alu case HV-2S Servo 31kg/ .118sec / 78g not bad for the price


http://www.hobbyking.com/hobbyking/s..._.118sec_/_78g
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Old 07-01-2010, 08:10 AM   #20
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That 7955 and the 7980 do have some good looking specs. With that being said I have been running a Futuba 9751 for almost 2 years with no problems. I even run it in my Short Course truck this winter for a few months before putting it back in the crawler.
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