E-Flite Park 400 Brushless Outrunner Motor, 740Kv

Updated on Jul 17, 2026 05:41:36 PM

Features

Slotted 12-pole outrunner design
Prop adapter (EFLM1923) and gold-plated connectors included
Excellent motor for small 3D and scale park flyers weighing 10–20 oz (280–560 g)
Motor mount included
Replacement for Speed 370 and Speed 400 applications
Quiet operationlow noise compared to gearbox systems

Overview

The great performance and small size of this engine makes it perfect for small 3D and other park flyer models. The external rotor design eliminates the need for a gearbox, saving you valuable weight to get the maximum performance out of the model.



You will need...
10–20A brushless ESC
10x7 to 12x3.8 prop

7.4V or 11.1V 860–1320mAh Li-Po

 E-flite Motor Comparisons (160 KB)

Specifications

Type: Brushless
Size: Replacement for 370/400
Bearings or Bushings: One 3.175 x 7.94 x 3.6 Bearing, and One 3.175 x 9.525 x 3.97 Bearing
Recommended Prop Range: 10x4.7-12x3.8
Voltage: 7.2–12
RPM/Volt (Kv): 740 (rpms per volt)
Resistance (Ri): .26 ohms
Idle Current (Io): .55 @ 10V (no load current)
Shaft Diameter: 1/8 in (3.17mm)
Overall Length: 1.15 in (29mm)
Weight: 56 g (2.0 oz)
Overall Diameter: 1.10 in (28mm)
Diameter: 1.1 in (28mm)
Continuous Current: 7A
Maximum Burst Current: 10A
Cells: 6–10 Ni-Cd/Ni-MH or 2–3 Li-Po
Speed Control: 10–20 amp brushless