Mid-air Collision of FPV RC Planes

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RC Planes with FPV gear flying in Formation with Gopro hero4 black and Runcam HD 2. Bad crash occurs at 2:20
Planes: Skywalker, FWX 1,5m and modified Easystar
Flying wing equipment:
FWX (FPV-Wing-X) 1.5m
Motor: NTM series 35-36B 1400Kv @ 500W-700W (10x7 Aeronaut 42mm)
Servos: 2 x BMS-621DMG+HS
Camera:600TVL SONY SUPER HADII WDR
OSD: EzOSD 100A Sensor
Tracker: EzAntennaTracker V2
Video Tx: Fox800
Video Rx: 12ch SAW filter mod
Antenna Tx: SPW circular wireless
Antenna Rx: DIY Crosshair / DIY Dipole
Video goggles: DIY Goggles with 1280x800
Ground video recording with a DVR
Video recording with Gopro Hero4 black
RC TX: Futuaba FX-18 with EzUHF
RC RX: EzUHF 8 channel diversity
RC- and video equipment is supplied by one Lipo, lowpass-filter installed
2 x Zippy 3S 4000mAh in parallel = 8000mAh
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