The E-flite 40A Pro Switch-Mode BEC Brushless ESC is a high-quality, innovative and efficient sensorless brushless electronic speed control with an integrated Switch-Mode BEC. It can operate without the need for a separate receiver battery to power your servos and receivers, saving you weight and complication. It is capable of up to 40 amps continuous current when using 3- to 6-series Li-Po battery packs. You can drive up to 7 analog or 6 digital standard-sized servos with the BEC on any recommended input voltage. This ESC also features an exposed, finned heat sink aluminum case with lightweight plastic endcaps. Additional features include safe power-arming along with advanced programmable features such as low-voltage cutoff, braking, timing, throttle input range, and more, making this truly a ‘pro series’ speed control.

• Brake: Yes - Programmable
• Continuous Maximum Current: 40A with reasonable cooling
• Input Voltage: 10.8V - 22.2V
• Input Connector Types: 13AWG with E-flite EC3 Connector
• Output Connector Types: 13AWG with 3.5mm Female Gold Bullet Connectors
• Momentary Peak Current: 55A (15 sec)
• Length: 2.70 in (68.6mm)
• Width: 1.30 in (33.0mm)
• Height: 0.50 in (12.7mm)
• Weight: 2.2 oz (62g)
• Wire Gauge: 13AWG

Tech Notes

Servo Ratings with BEC Enabled:

Drive up to 7 analog or 6 digital standard-sized servos with the BEC on any recommended input voltage. This also includes up to 7 standard analog or 5 standard digital and 1 retract servo, perfect for 25-sized warbird conversions. Some servo combinations we have tested in various models include:

4 JR SPORT MN48 (JSP20040) analog mini servos—E-flite Diamante 25e ARF and J-3 Cub 25e ARF

4 JR DS3421 (JRPSDS3421) digital mini servos—E-flite Eratix 3D 25e ARF

7 JR MC35 (JSP20030) analog micro servos and 1 JR RT88 (JSP20080) retract servo—25-sized warbird

4 JR MC35 (JSP20030) analog micro servos—15-sized sport aerobatic

6 JR SPORT MN48 (JSP20040) analog mini servos—E-flite Ultra Stick 25e ARF & 15-size sport plane

Some other brands and models of servos may have significantly higher current draw. Digital servos and binding servos of any kind typically have higher current draw. As a general rule, mini and micro servos draw less current which may affect your servo usage as shown in the examples above. We recommend the use of a Hangar 9 Servo and Receiver Current Meter (HAN172), installed between the throttle lead of the ESC and receiver, to confirm current draw of the actual servos used. Also, always be sure to position the ESC for maximum airflow since cooling can significantly aid in the performance of the BEC.

Before first use, please refer to “Servo Ratings with BEC Enables” notes for BEC usage guidelines. You must follow these guidelines for safe operation. If you are using more than 7 analog standard servos, more than 6 digital standard servos, or servos with higher current draw than the BEC can deliver, you will need to disable the BEC. If you wish to disable the BEC, you must remove the red receiver wire lead and connector from the receiver lead housing, and then insulate it properly to prevent shorting. When operating with the BEC disabled, E-flite recommends the use of a separate, high-power, external BEC (like the Ultimate BEC), or receiver pack and switch using the following items to ensure trouble-free operation:

1. JR 1100mAh 4.8V Ni-MH receiver battery (JRPB4240), or similar

2. JR Switch Harness (JRPA003), or similar