Power HD Storm Series Brushless Digital Servo | S15 16.5KG / S25 30KG / S35 35KG | SSR Mode RC Car Servo
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Frequently Asked Questions
What is SSR mode and do I need a special receiver to use it?
SSR (Super Speed Response) mode is a high-frequency signal protocol that allows the servo to respond significantly faster than standard PWM. To use SSR mode, you need a compatible high-speed receiver that supports SSR output (such as select Sanwa, Futaba, or compatible receivers). In standard mode, the Storm Series works with any conventional RC receiver at 333Hz - no special hardware required. SSR mode is an optional upgrade for racers who want the absolute fastest response times.
What's the difference between the S15, S25, and S35 - which one is right for my car?
All three models share the same brushless motor, titanium & steel gears, and SSR compatibility, but differ in torque output and physical size. The S15 (16.5KG) is the lightest at 52g and smallest in height (26mm), making it ideal for weight-sensitive 1/10 touring cars and tight chassis. The S25 (30KG) and S35 (35KG) are both 75g with the same footprint (40.7 x 20.5 x 38.6mm) - choose the S25 for a balance of speed and torque, or the S35 for maximum steering authority in competition or aggressive driving.
Are the Storm Series servos compatible with LiPo batteries - what voltage should I run?
Yes. All three Storm Series models operate on 6.0V to 8.4V DC, making them fully compatible with 2S LiPo (7.4V) and 2S LiHV (8.4V) battery systems. Running at higher voltage delivers more torque and faster speed - for example, the S35 jumps from 26.0 kg-cm at 6.0V to 35.0 kg-cm at 8.4V. NiMH packs at 6.0V are also supported. Do not exceed 8.4V to avoid damaging the servo.
How durable are the gears - will they strip under hard racing or bashing use?
The Storm Series uses a Titanium & Steel hybrid gear train, which offers a strong balance of lightweight strength (titanium) and impact resistance (steel). Combined with dual ball bearings and an all-metal case, these servos are built for sustained racing loads. That said, like any precision servo, extreme crashes or binding can cause gear damage. For heavy bashing on rough terrain, we recommend pairing with a servo saver to protect the gear train.
Does the color choice (Red, Yellow, Black) affect performance or specifications?
No - the color variants (Red, Yellow, Black) are purely cosmetic and do not affect performance, torque, speed, or compatibility in any way. All color options within the same model (S15, S25, or S35) share identical internal components and specifications. Choose the color that best matches your chassis or personal style.
What's in the Box
- 1x Power HD Storm Series Brushless Digital Servo (S15, S25, or S35 depending on selected variant)
- 1x Servo Horn Set
- 1x Mounting Screws
- 1x User Manual / Specification Sheet
Let customers speak for us
Description
Power HD Storm Series — SSR-Compatible Brushless Digital Servo for Competitive RC Racing
The Power HD Storm Series (S15, S25, S35) is a next-generation brushless digital servo lineup engineered for high-speed RC car racing. Featuring SSR (Super Speed Response) mode compatibility, titanium & steel gear trains, and all-metal construction, the Storm Series delivers race-winning precision across three torque tiers. Available in Red, Yellow, and Black colorways.
Storm Series Highlights
- SSR Mode Compatible — ultra-fast signal response for high-frequency receivers
- Brushless Motor — cooler, faster, and longer-lasting than brushed alternatives
- Titanium & Steel Gear Train — maximum durability under racing loads
- Dual Ball Bearings — smooth, precise centering and reduced wear
- All-Metal Case — CNC machined for rigidity and heat dissipation
- 3 Color Options — Red, Yellow, Black to match your build
Technical Specifications
S15 — 16.5KG
- Torque: 11.5 kg-cm (159.7 oz-in) @ 6.0V | 15.0 kg-cm (208.3 oz-in) @ 7.4V | 16.5 kg-cm (229.1 oz-in) @ 8.4V
- Speed: 0.072 sec/60° @ 6.0V | 0.060 sec/60° @ 7.4V | 0.050 sec/60° @ 8.4V
- Operating Voltage: 6.0V – 8.4V DC
- Weight: 52.0g (1.83 oz)
- Bearing: Dual Ball Bearing | Motor: Brushless | Gears: Titanium & Steel
- Operating Temperature: -20°C to 60°C
- Frequency: 760μs / 333Hz
- Dimensions: 41.0 x 20.0 x 26.0mm (1.61 x 0.79 x 1.02 in)
S25 — 30KG
- Torque: 21.5 kg-cm (298.6 oz-in) @ 6.0V | 25.0 kg-cm (347.2 oz-in) @ 7.4V | 30.0 kg-cm (416.6 oz-in) @ 8.4V
- Speed: 0.075 sec/60° @ 6.0V | 0.060 sec/60° @ 7.4V | 0.055 sec/60° @ 8.4V
- Operating Voltage: 6.0V – 8.4V DC
- Weight: 75.0g (2.65 oz)
- Bearing: Dual Ball Bearing | Motor: Brushless | Gears: Titanium & Steel
- Operating Temperature: -20°C to 60°C
- Frequency: 1520μs / 333Hz
- Dimensions: 40.7 x 20.5 x 38.6mm (1.60 x 0.81 x 1.52 in)
S35 — 35KG
- Torque: 26.0 kg-cm (361.1 oz-in) @ 6.0V | 30.0 kg-cm (416.6 oz-in) @ 7.4V | 35.0 kg-cm (486.1 oz-in) @ 8.4V
- Speed: 0.095 sec/60° @ 6.0V | 0.075 sec/60° @ 7.4V | 0.070 sec/60° @ 8.4V
- Operating Voltage: 6.0V – 8.4V DC
- Weight: 75.0g (2.65 oz)
- Bearing: Dual Ball Bearing | Motor: Brushless | Gears: Titanium & Steel
- Operating Temperature: -20°C to 60°C
- Frequency: 1520μs / 333Hz
- Dimensions: 40.7 x 20.5 x 38.6mm (1.60 x 0.81 x 1.52 in)
Which Model Should I Choose?
- S15 (16.5KG) — Lightweight builds, 1/10 touring cars, tight chassis with limited servo bay space
- S25 (30KG) — All-around 1/10 performance, buggies, and mid-size platforms requiring more steering authority
- S35 (35KG) — Maximum torque for 1/10 competition racing, heavy steering loads, and aggressive driving styles
Shipping Info
🏭 Fulfillment Warehouses
SoarSky operates warehouses in the US, Europe, and China. Orders are fulfilled from the nearest local warehouse. If local stock is unavailable, your order will ship from our China warehouse and international shipping times will apply.
💰 Shipping Rates
| Type | Condition | Cost |
|---|---|---|
| Free Shipping | Orders over $100 | Free |
| Standard Shipping | Orders under $100 | Based on weight & address |
| International Shipping | All international orders | Based on destination & weight |
⏱️ Dispatch & Delivery Times
| Region | Estimated Delivery |
|---|---|
| Domestic (US) | 5–10 business days |
| International | 10–15 business days |
* Customs processing may affect international delivery times.
🚫 Shipping Restrictions
Some remote areas may experience longer delivery times or limited shipping options. We will notify you if any issues arise.
📦 Order Tracking
Once your order ships, you will receive a confirmation email with a tracking number. Track your shipment via:
| Platform | Link |
|---|---|
| 17Track | www.17track.net |
| SoarSky Order Tracker | soarskyrc.com/pages/track-order-1 |
📬 Contact Us
If you encounter any issues such as damaged items or lost packages, please contact our customer service team as soon as possible and we will work to resolve it promptly.