6 Servos that Won't Disappoint - Servo City - RC Groups

6 Servos that Won't Disappoint - Servo City

Servos are are a necessity in our radio control hobby. Here is a story from the folks at Servo City about six servos you should know about with added info from the servo descriptions and spec sheets.

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Servos to Know

I realized very quickly in my RC hobby that your servos better work! Years later I have piles of servos from planes that found their "expiration date." After all this time I still check RCGroups.com to make sure I'm using an adequate servo for my application. Here is a story from Servo City that goes over 6 servos and their uses. I have added the specs of each servo and descriptions in the photos for even more info...

From Servo City

"Which servo should I use for my project?"

This is a question we are asked on a daily basis. The answer depends on your application and numerous other factors. Here is a short list of go-to's among the hundreds of servos we offer. Price, performance or even uniqueness all play a part. Let's take a closer look....

HS-485HB

This servo is designed with long-lasting Karbonite gears and a ball-bearing supported output shaft to reduce friction. Excellent performance at an entry level price.

  • Dimensions 1.57" x 0.78" x 1.49" (39.88 x 19.81 x 37.85mm)
  • Product Weight 1.59oz (45g)
  • Output Shaft Style 24 tooth (C1) spline
  • Voltage Range 4.8V - 6.0V
  • No-Load Speed (4.8V) 0.22sec/60
  • No-Load Speed (6.0V) 0.18sec/60
  • Stall Torque (4.8V) 66.6 oz/in. (4.8kg.cm)
  • Stall Torque (6.0V) 83.3 oz/in. (6.0kg.cm)
  • Max PWM Signal Range (Standard) 553-2425μsec
  • Travel per s (out of box) .102/μsec
  • Max Travel (out of box) 190.5
  • Pulse Amplitude 3-5V
  • Operating Temperature -20C to +60C
  • Current Drain - idle (4.8V) 8mA
  • Current Drain - idle (6.0V) 8.8mA
  • Current Drain - no-load (4.8V) 150mA
  • Current Drain - no-load (6V) 180mA
  • Continuous Rotation Modifiable Yes
  • Direction w/ Increasing PWM Signal Clockwise
  • Deadband Width 8s
  • Motor Type 3 Pole Ferrite
  • Potentiometer Drive Indirect Drive
  • Feedback Style 5KΩ Potentiometer
  • Output Shaft Support Top Ball Bearing, Bottom Bushing
  • Gear Type Straight Cut Spur
  • Gear Material Karbonite
  • Wire Length 11.81" (300mm)
  • Wire Gauge 25AWG

HS-645MG

The powerful HS-645MG is the highest torque standard size analog servo offered by Hitec. Utilizes metal gears for high-impact applications.

  • Dimensions 1.59" x 0.77"x 1.48" (40.6 x 19.8 x 37.8mm)
  • Product Weight 1.94oz. (55.2g)
  • Output Shaft Style 24 tooth (C1) spline
  • Voltage Range 4.8V - 6.0V
  • No-Load Speed (4.8V) 0.24sec/60
  • No-Load Speed (6.0V) 0.20sec/60
  • Stall Torque (4.8V) 106.93 oz/in. (7.7kg.cm)
  • Stall Torque (6.0V) 133.31 oz/in. (9.6kg.cm)
  • Max PWM Signal Range (Standard) 553-2520μsec
  • Travel per s (out of box) .100/μsec
  • Max Travel (out of box) 197
  • Pulse Amplitude 3-5V
  • Operating Temperature -20C to +60C
  • Current Drain - idle (4.8V) 8.8mA
  • Current Drain - idle (6.0V) 9.1mA
  • Current Drain - no-load (4.8V) 350mA
  • Current Drain - no-load (6V) 450mA
  • Continuous Rotation Modifiable Yes
  • Direction w/ Increasing PWM Signal Clockwise
  • Deadband Width 8s
  • Motor Type 3 Pole Ferrite
  • Potentiometer Drive Indirect Drive
  • Feedback Style 5KΩ Potentiometer
  • Output Shaft Support Dual Ball Bearings
  • Gear Type Straight Cut Spur
  • Gear Material 3 Metal Gears and 1 Resin Metal Gear
  • Wire Length 11.81" (300mm)
  • Wire Gauge 22AWG

HS-785HB

The HS-785HB servo is unique due to its ability to rotate nearly eight rotations while retaining positioning feedback!

  • Dimensions 2.32" x 1.14"x 1.96" (59 x 29 x 50mm)
  • Product Weight 3.88 oz.. (110g)
  • Output Shaft Style 24 tooth (C1) spline
  • Voltage Range 4.8V - 6.0V
  • No-Load Speed (4.8V) 1.68sec/360
  • No-Load Speed (6.0V) 1.4sec/360
  • Stall Torque (4.8V) 152.75 oz/in. (11kg.cm)
  • Stall Torque (6.0V) 183 oz/in. (13.2kg.cm)
  • Max PWM Signal Range (Standard) 600-2400μsec
  • Travel per s (out of box) 1.57
  • Max Travel (out of box) 2826
  • Pulse Amplitude 3-5V
  • Operating Temperature -20C to +60C
  • Current Drain - idle (4.8V) 8mA/
  • Current Drain - idle (6.0V) 8.7m
  • Current Drain - no-load (4.8V) 230mA
  • Current Drain - no-load (6V) 285mA
  • Continuous Rotation Modifiable Yes
  • Direction w/ Increasing PWM Signal Clockwise
  • Deadband Width 8s
  • Motor Type 3 Pole Ferrite
  • Potentiometer Drive Indirect Drive
  • Feedback Style 5KΩ Potentiometer
  • Output Shaft Support Dual Ball Bearings
  • Gear Type Straight Cut Spur
  • Gear Material Karbonite
  • Wire Length 11.81" (300mm)
  • Wire Gauge 22AWG

HS-805MG

The HS-805MG servo is the beefed up version of the legendary 805BB monster servo! Designed with metal gears and 343 oz-in of torque.

  • Dimensions 2.59" x 1.18"x 2.26" (66 x 30 x 57.6mm)
  • Product Weight 6.95 oz. (197g)
  • Output Shaft Style 15 tooth (D1) spline
  • Voltage Range 4.8V - 6.0V
  • No-Load Speed (4.8V) 0.19sec/60
  • No-Load Speed (6.0V) 0.14sec/60
  • Stall Torque (4.8V) 274.96 oz/in. (19.8kg.cm)
  • Stall Torque (6.0V) 343.01 oz/in. (24.7kg.cm)
  • Max PWM Signal Range (Standard) 553-2455μsec
  • Travel per s (out of box) .105/μsec
  • Max Travel (out of box) 199.5
  • Pulse Amplitude 3-5V
  • Operating Temperature -20C to +60C
  • Current Drain - idle (4.8V) 8mA
  • Current Drain - idle (6.0V) 8.7mA
  • Current Drain - no-load (4.8V) 700mA
  • Current Drain - no-load (6V) 830mA
  • Continuous Rotation Modifiable Yes
  • Direction w/ Increasing PWM Signal Clockwise
  • Deadband Width 8s
  • Motor Type 3 Pole Ferrite
  • Potentiometer Drive Indirect Drive
  • Feedback Style 5KΩ Potentiometer
  • Output Shaft Support Dual Ball Bearings
  • Gear Type Straight Cut Spur
  • Gear Material 4 Heavy Duty Metal Gears & 1 Nylon Gear
  • Wire Length 11.81" (300mm)
  • Wire Gauge 22AWG

HSR-2645CRH

The standard size servo with continuous rotation. Its linear, proportional speed control makes this an excellent choice for compact camera control setups.

  • Dimensions 1.59" x 0.77" x 1.48" (40.6 x 19.8 x 37.8 mm)
  • Product Weight 1.87 oz (53 g)
  • Output Shaft Style 24 tooth (C1) spline
  • Voltage Range 4.8 - 7.4 V
  • No-Load Speed (4.8V) 46 RPM
  • No-Load Speed (6.0V) 58 RPM
  • No-Load Speed (7.4V) 72 RPM
  • Stall Torque (4.8V) 111.09 oz-in (8 kg-cm)
  • Stall Torque (6.0V) 138.87 oz-in (10 kg-cm)
  • Stall Torque (7.4V) 166.64 oz-in (12 kg-cm)
  • Pulse Amplitude 3-5 V
  • Operating Temperature -20C to +60C
  • Direction w/ Increasing PWM Signal Clockwise
  • Motor Type Carbon Brushed Cored Motor
  • Potentiometer Drive No Potentiometer
  • Feedback Style This servo does not have position feedback
  • Output Shaft Support Dual Ball Bearings
  • Gear Type Straight Cut Spur
  • Gear Material Metal
  • Wire Length 25 AWG

HSB-9380TH

This servo is a brushless beast! It's Neu brushless motor, titanium gears and low current consumption provide tremendous durability and longer run-times between charges.

  • Dimensions 1.57 x 0.79 x 1.50 (40 x 20 x 38mm)
  • Product Weight 2.4oz (68g)
  • Output Shaft Style 25 tooth (H25T) spline
  • Voltage Range 6.0V - 7.4V
  • No-Load Speed (6.0V) 0.17 sec/60
  • No-Load Speed (7.4V) 0.14 sec/60
  • Stall Torque (6.0V) 472 oz/in. (34 kg.cm)
  • Stall Torque (7.4V) 472 oz/in. (34 kg.cm)
  • Max PWM Signal Range (Standard) 700-2300μsec
  • Travel per s (out of box) .075/μsec
  • Max Travel (out of box) 120
  • Pulse Amplitude 3-5V
  • Operating Temperature -20C to +60C
  • Continuous Rotation Modifiable Yes
  • Direction w/ Increasing PWM Signal Clockwise
  • Deadband Width 2s
  • Motor Type Brushless
  • Feedback Style 5KΩ Potentiometer
  • Output Shaft Support Dual Ball Bearings
  • Gear Type Straight Cut Spur
  • Gear Material Titanium (Hybrid MPD 1st Gear)
  • Wire Length 11.81" (300mm)
  • Wire Gauge 20AWG

Visit Servo City

You can find the perfect servo for your project at Servo City.

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Dec 28, 2017, 10:25 AM
Wandering IT geek
ronin4740's Avatar
The last set of Hitech servos (HS225BBs) I purchased had horrible centering issues. Might have been okay for a big trainer but was certainly not for a Q500 pylon racer. I replaced them with another brand and solved the issue.

Perhaps I just got four bad ones...
Dec 28, 2017, 12:09 PM
I think it's time to fly.
Rhea's Avatar
Most servos one might expect a Beginner to use would be in the 9g range.
Latest blog entry: All things that fly.
Dec 28, 2017, 03:33 PM
Sagitta Fanboy
Quote:
Originally Posted by Rhea
Most servos one might expect a Beginner to use would be in the 9g range.
Unless of course they're using a standard trainer, which will take standard-sized servos (although more likely to be HS-311's or HS-422's than the monsters in this list)
Jan 10, 2018, 03:33 AM
Registered User
Deadband Width 8s will definitely disappoint you!
Jan 10, 2018, 04:10 AM
Registered User
Quote:
Originally Posted by Pippin
Deadband Width 8s will definitely disappoint you!
Pippin how does that affect the servo?
I bought a bunch of the 485hb. but i had some small movement in all of them. it was a grinding noise that occured evry few second.
Later i decided to read up about the 485hb and i found out that it was not uncommon that people had failures with these servos. I decided to not use them and replaced them with other servos.

Next time i will search for info before i buy a new typ of servo and not just look at specs and price.
Jan 10, 2018, 11:10 PM
Registered User
Meh, on these larger servos. Most Hitec servos IMO are just not that good. The HS 82MG and the 225 are horrible. Sloppy and they fail. The 645MG and HS81 are pretty solid and their big winner is of course the 65MG. Now that is a great servo. The rest, not so much.

For the bigger stuff, I use and trust Futaba and JR.
Jan 11, 2018, 05:40 AM
A man with too many toys
I have had good results from the larger servos but not the saller ones (HS-65 and smaller). I don;t use anything smaller than HS-85 from Hitec.

My main complaint is the value. Most Chinese servos are excellent at a much lower price.

Why is Hitec so much more expensive than other Chinese brands?

.
Jan 11, 2018, 01:00 PM
Registered User
The above infomercial is a Sure sign that Hitec is suffering.


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