Racing Drone 20A 2-4S Mini BLHeli-S OPTO ESC
£7.90 Inc. VAT
These affordable ESCs are perfect for those building their first racing drone.
In stock|Next shipping: 16/03/2026
These affordable ESCs are perfect for those building their first racing drone. It is rated at 20amps, supports 2-4S LiPo batteries, weighs just 7.9g and measures a tiny 27x12mm, meaning it can be installed with room to spare on a 250 FPV racing quad. They also follow the latest trend of having solder pads rather than pre-attached wires, which makes the soldering much easier.
With these ESCs you can take advantage of the BLHeli_S. They come with BLHeliS firmware pre-flashed and support DShot300 or DShot600. The ESCs utilise a high-performance Silabs EFM8BB21 50MHz microprocessor for smooth response and high-resolution throttle steps, making them ideal for racing drones. Firmware can be upgraded via the signal wire using a USB flash tool. Finally, the ESC is of the OPTO type (no BEC), which helps to eliminate radio interference between the motor and receiver.
Features:
- Tiny form factor and low weight
- Specially designed for multicopters, super fast throttle response
- Powered by high performance EFM8BB21 MCU
- BLHeli-S firmware/ Supports DSHOT, MULTISHOT, ONESHOT42, ONESHOT125
- Supports Dshot 150,300 and 600
- Fast throttle response – high 500Hz maximum refresh rate compatible with all flight controllers
- Twisted signal cable reducing the crosstalk during signal transfer
- Continuous current: 20A
- Peak Current(10s): 25A
- BEC: NO
- LiPo: 2-4S
- Firmware: Blheli_S
- Programming: Supported
- Weight: 7.9g
- Size: 27x12mm
Included:
- 1x 20A 2-4S Mini BLHeli-S ESC
Questions and answers of the customers
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Here at Flying Tech we have a wide choice of electronic speed controllers (ESCs).
There are two main types of ESCs: 4-in-1 ESCs and single ESCs. A 4-in-1 ESC integrates four individual ESCs onto a single circuit board, each controlling a separate motor. A single ESC controls only one motor.
This 4-in-1 ESC is a more popular choice for racing quads, while single motor aircraft such as fixed wings would use a single ESC. Single ESCs are still used by some drone racers though, as after a crash or a burnt up ESC, they only have to replace one, not an entire 4-in-1 or stack which is a lot more costly. Single ESCs are also available which much greater current ratings (80amp +) so they are also used by power hungry multi-rotors, for example X-Class racing quads, professional camera flying “Cinelifters”.
When using individual ESCs, they typically need to be connected to a single power distribution board (PDB) or an “AIO flight controller” (a type of flight controller with integrated PDB) for power supply.
SHIPPING & DELIVERY
We are based in the UK and ship to most destinations worldwide.
We dispatch orders during the times shown on our Dispatch Schedule. Orders placed before the daily dispatch cutoff will ship the same day (subject to stock availability). Orders placed after the cutoff will ship on the next scheduled dispatch day.
A confirmation email is sent once your order has been packed. If you need to amend your order, please contact us as soon as possible — once shipped, we’re unable to make changes.
We work with trusted delivery partners including Royal Mail, DHL, UPS, Fedex and Parcelforce. If you have a delivery requirement or would like to arrange collection, please get in touch.
Please fill in the fields below with the shipping destination details in order to calculate the shipping cost.
Shipping to the UK
- Order before the daily dispatch cutoff for same day dispatch.
- FREE delivery available on qualifying orders over £99 (under 1kg).
For small, low-value orders, Royal Mail First Class is our most economical option. Royal Mail Tracked 24 is the most popular choice, offering full tracking and flexible delivery options. For guaranteed next working day delivery, we recommend Royal Mail Special Delivery.
Royal Mail delivers to residential addresses Monday to Saturday, while courier services (including DHL) typically deliver Monday to Friday.
International Postage
- USA orders: Import duties and taxes are prepaid by us — no additional customs charges on delivery.
- Other destinations: Customs duties or import taxes may apply and are the responsibility of the recipient.
Smaller, lower-value orders may be sent via Airmail or tracked postal services. Economy road and express air courier options are available depending on destination. For faster delivery, we recommend express air courier services such as DHL Express, which typically deliver within 1–2 working days across Europe and a few working days for most other destinations.
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