Compact size for 5" propellers, 214mm motor to motor.
Multiple motor mounting holes to fit a variety of motors (M3 and M2 screw mounting patterns).
"Bumpers" on the end of the arms to protect the motor during a crash, just like the QAV250.
Included power distribution board and XT-60 Pig-Tail to power ESCs and FPV flight electronics.
LiPo battery protection plate included.
Support to carry HD camera at 35 degree angle(such as the GoPro 4, Mobius, etc).
Lightweight and rigid
F3 Flight Control Acro 6DOF
35x35mm board, 30mm mounting holes. STM32F3 CPU. High-capacity Flash MPU6050 Accelerometers and Gyroscopes MicroUSB socket. 4 x 4 pin JST-SH Socket (I2C, SWD, 2xuart) 2 x 8 pin JST-SH Socket (PPM, PWM, SERIAL RX, GPIO, ADC, 3V, 5V, GND) 8 x 3 pin though-holes for pin headers for ESC / Servo connections. 2 x 4 pin though-holes for the 2x serial ports . 2 x 2 pin though-holes for battery voltage and buzzer.
Racerstar Racing Edition BR2205 2600KV 2-4S Brushless Motor
RPM/V: 2600KV
Height: 31.5mm
Width: 27.9mm
Shaft diameter: M5
Motor mount hole size: M3
Weight: 28 grams
Voltage: 2-4S
Battery: 2-4S lipo battery
Internal resistance: 
Usage: for 250 260 280 Multirotor Frame Kit
Racerstar RS20A V2 20A Blheli_S ESC
Model: RS20A V2 Con.Current:20A Peak Current(10s):25A Input Voltage: 2-4S BEC: No Programming : YES Firmware: Blheli_S Net Weight: 5.67g Size:27*12mm
Chips on EFM8BB21F16, 48MHZ Greatest . BLHeli_S is designed for superior performance in multirotors, and uses hardware generated motor pwm for smooth throttle response and silent operation. Small size combined with light weight for easy installation. The code supports regular 1-2ms pulse width input, as well as Oneshot125 (125-250us), Oneshot42 (41.7-83.3us) and Multishot (5-25us). The input signal is automatically detected by the ESC upon power up. All codes use damped light mode.Damped light does regenerative braking, causing very fast motor retardation, and inherently also does active freewheeling The code supports features to prevent sync loss. There are tuneable parameters that can make the code run well even in the most demanding situations, although default settings will work excellently in normal operating environments The code also supports a beacon functionality, where the ESC will start beeping after a given time of zero throttle. This can be very useful for finding lost crafts.
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