ProTek RC 250S Standard Digital "Super Speed" Helicopter Tail Servo (High Voltage/Metal Case)

ProTek RC 250S Standard Digital "Super Speed" Helicopter Tail Servo (High Voltage/Metal Case)
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This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.

This is the ProTek R/C 250S Digital Hi-Speed Helicopter Metal Gear High Voltage Tail Servo. ProTek R/C Servos have been developed to provide enthusiasts with high quality servo's that will exceed expectations at every level. With features that meet or surpass what our competition can provide, ProTek R/C servos deliver performance and unmatched value, with industry leading customer support.

The ProTek R/C 250S Tail servo delivers lightning fast 0.03 transit speed and 160 oz-in of torque at 7.4V. Other features include a full aluminum case that provides bomb proof durability and improved heat dissipation, a metal gear train that is supported by dual ball bearings, a 200mm long 22awg connector wire with gold plated connectors, and a coreless motor.

Plus, instead of a cheap plastic servo horn, ProTek R/C goes the extra mile with an included aluminum clamping style double arm servo horn that will stand up to a majority of the punishment you can throw at it. Stop wasting your money on budget servos that look good in the spec list, but fall short when its time to perform. Get ProTek and don't look back.

Warning! This ProTek R/C servo requires that you use a m3x10mm screw to attach the servo horn to the output shaft. If you choose to use another screw, be sure to use a 10mm length screw. Use of a shorter screw can cause failure and will void your warranty. 


  • Developed for helicopter tail applications
  • Full aluminum case
  • 0.03 transit speed, and 160 oz-in of torque @ 7.4V
  • 1520μs / 333hz working frequency
  • Aluminum clamping dual arm servo horn
  • Full metal gears and dual ball bearings
  • 200mm long 22awg connector wire w/gold plated connectors
  • Coreless motor

Servo Model
Recommended Application Helicopter Tail
Operating Voltage 4.8V - 7.4V
Operating Temperature 14° to 140° F (-10 to +60° C)
Operating Speed @ 6.0V 0.04/60° sec
Operating Speed @ 7.4V
0.03/60° sec
Dynamic Torque @ 6.0V
120 oz-in (8.6 kg-cm)
Dynamic Torque @ 7.4V
160 oz-in (11.5 kg-cm)
Motor Type
High Efficiency Coreless Motor
Output Shaft 25 Tooth
Gears Metal
Weight 74.8g
1520μs / 333hz

Notice: ProTek R/C helicopter servos may require an isolated power source or the use of a high-amperage power regulator, like the PTK-4000.

Like many of other leading helicopter servo lines, the high torque and speed specs of ProTek R/C helicopter servos also mean that these units can generate high-frequency noise on the power lines, which can interfere with the proper operation of some flybarless systems and receivers.

We have confirmed this issue exists with the MSH Brain, iKon, newer Vbar Silverline, and the Spartan VX1 and VX1n. Our lab tests indicate older VBar units and the BeastX are far less susceptible to interference and should work well with ProTek R/C servos, even without a power regulator or isolated power source. 

We strongly recommend running two separate power sources (i.e., one battery for the servos and another for the flybarless systems) as the best way to eliminate any possible interference.
An alternative approach is to use a power regulator to filter the power bus between the servos and flybarless system. In order to do so, you must run it in regulator (not bypass) mode.

As today’s servos push the limits of speed and torque specs, flybarless systems need to evolve similarly. Nevertheless, we are aggressively pursuing design changes and power isolation/regulation accessories that will broaden the compatibility of our helicopter servos, while maintaining the leading level of performance you’ve come to expect from ProTek R/C. 

 ProTek R/C is an AMain Sports & Hobbies brand.

This product was added to our catalog on October 29, 2012

Verified Owner
Friday, Jan 23 2015 (about 5 years ago)
ProTek RC 250S Standard Digital "Super Speed" Helicopter Tail Servo (High Voltage/Metal Case)
Wow put this puppy in my Goblin 630 works great on 7.4v...
Verified Owner
Tuesday, Jul 29 2014 (about 6 years ago)
ProTek RC 250S Standard Digital "Super Speed" Helicopter Tail Servo (High Voltage/Metal Case)
I have this servo on the tail of my 550, 700 and my 800. They are silent and amazing servos. I have yet to damage a gear set due to a crash. 250Ts on cyclic and they hold up perfectly as well. Love them!