THETA THS921A Coreless HV Servo

THETA THS921A: a digital swashplate servo for radio controlled helicopters.
Micro size (23x12mm), HV compatible (2S Lipo), Coreless motor, Metal gears and full aluminium case.
The versatility of this servo is quite wide. It can thus be used for several applications (airplanes, cars, etc.).

With a real monstrous torque (7.5 kg/cm at 8.4 V), the THS921A outperforms all other micro servos marketed to date. This incredible micro swashplate servo is perfect for small helicopters (420mm max blade length). Today, the THS921A is highly prized by experienced pilots for its unmatched power and precision.

The THETA THS921A Coreless Micro Servo is also 100% high voltage compatible, ensuring full integration with your helicopter's electronics.

Although it is perfect for cyclic application, the very versatile THS921A can also be used as a tail servo.

Do you want to improve the performance of your RC helicopter? Try the THETA THS921A and discover the power and precision of this little high-tech gem.

Specifications:

- Operating voltage: 6 - 8,4 V DC (2S Lipo)
- Motor type: coreless
- Gear: metal
- Torque: 5,8 kg.cm (6,0V) / 6,8 kg.cm (7,4V) / 7,5 kg.cm (8,4V)
- Speed: 0,11 sec/60° (6,0V) / 0,090 sec/60° (7,4V) / 0,080 sec/60° (8,4V)
- Neutral pulse: 1520µs (factory setting)
- Working frequency: 50 à 400 Hz
- Dimension: 23 x 12 x 27,4 mm
- Wire length: 190 +5 mm
- Case: full aluminium
- Weight: 21g
- Output shaft: 25T / Ø 4,9mm (Futaba 25T compatible)

In the TH921A box:

1x Servo THS921
4x Servo horn
1x Screw M3
4x Tapping screw for servo

Learn more about THETA:

THETA is a brand of Shenzhen Yifengze Industrial Co., Ltd. This company was established in 2014 and mainly produces electronic equipment for flying models. After many years of experience, the company launched its own brand "Theta" in 2018.
Theta is committed to manufacturing high-performance model servos, to bring a truly satisfying experience to all RC enthusiasts.
Theta servos are extremely efficient and provide excellent performance while having low power consumption. Theta servos are also versatile and innovative as they are the first servos to offer NFC programmability.

When choosing a servo, many pilots make their selection by comparing the technical parameters in the product description. Is this the best option? Here is the view from the manufacturer Theta:
First of all, the development concept of Theta Servos is based on the search for the best balance between high performance and the best reliability. It is not about outperforming competing manufacturers in terms of technical parameters.
Consequently, compared to those of other manufacturers, Theta servos, with technical parameters which do not a priori present a competitive advantage, offer a real advantage in terms of overall performance.
Most servos are generally designed to achieve high torque, but this often requires increasing the current, which significantly reduces motor life. Therefore, servo development must be considered holistically without seeking optimization of a single parameter.
When designing the Theta Razor-X1 servo for example, the prototype was tested in various environments and feedback from numerous pilots was taken into account.
The design torque of this servo is 47kg/cm at 7.4V and the speed is 0.13s/60°, which meets most flight scenarios. The Razor X1 achieves the balance between torque, speed and current, emitting the minimum amount of heat. The X1 thus achieves the objective of high performance, high reliability, silence and energy saving.