1 / 3Standard checkout available. Verified maker dispatch.
The Readytosky 20A ESC is a compact BLHeli-S OPTO speed controller for FPV racing and RC helicopters. The page says OPTO means there is no built-in BEC, so power regulation is handled separately.
It supports 2-4S LiPo, 20A continuous and 25A peak (10 s), and DShot150/300/600, PWM, Oneshot125 and Oneshot42 signals. It has integrated temperature sensor protection and supports two-way mode and FPV 3D mode. The page showed 30 in stock at Rs 849 (SKU RS4317/RS4642).
20A continuous, 25A peak: the peak is for 10 seconds.
BLHeli-S OPTO design: no built-in BEC.
DShot150, 300 and 600: the newest protocols.
PWM, Oneshot125 and Oneshot42: also supported.
Temperature sensor protection: as listed.
Two-way and 3D mode: supported.
An electronic speed controller (ESC) converts the throttle signal from the flight controller into the three-phase power that a brushless motor needs. It switches battery current through MOSFETs at high speed, so the motor turns at the speed that the pilot or autopilot asks for. The continuous current rating shows how much current the ESC can carry all the time, and the burst rating shows what it can survive for a few seconds.
Match the ESC to the rest of the power system. The battery cell count must fall inside the listed range, the continuous current must be higher than what your motor and propeller draw at full throttle, and the signal protocol (for example PWM, Oneshot, Multishot or DShot) must be supported by your flight controller. An ESC marked OPTO has no built-in BEC, so the receiver and flight controller need power from another source. An ESC with a BEC can supply a regulated voltage, usually 5V, to small electronics.
Install and test carefully. Solder joints must be clean and strong, the motor wires should be kept short and tidy, and the ESC needs airflow because current makes heat. Calibrate the throttle range if the ESC needs it, check the motor direction with the propellers removed, and never connect a battery with the propellers fitted while you are working on the wiring. Use a battery with a cell count and connector that suit the ESC, and check for a heat problem after a short test hover.
FPV racing
Small helicopters
2-4S quads
3D flying
Compact builds
Because it is an OPTO ESC, the flight controller or a separate BEC must power the receiver and other electronics.
It supports two-way mode and FPV 3D mode.
Model: 20A BLHeli-S OPTO ESC
Batteries: 2-4S LiPo
Continuous current: 20A
Peak current (10 s): 25A
Protocols: DShot150/300/600, PWM, Oneshot125/42
BEC: none (OPTO)
Protection: temperature sensor
1 x Readytosky 20A ESC
Builders who need a compact 20A ESC without a BEC.
No, it is an OPTO ESC.
20A continuous, 25A peak for 10 s.
DShot150/300/600, PWM, Oneshot125 and Oneshot42.
2-4S LiPo.
| Brand | Readytosky |
|---|---|
| Battery Compatibility | 2-4S LiPo |
| Continuous Current | 20.000000 A |
| Supported Protocols | DShot150/300/600, PWM, OneShot125/42 |
| Selling unit | PCS |
