[SOLVED] APM 2.6 Quadcopter won't lift

This video describes the quadcopter behavior when moving up the throttle:

Quadcopter specs:

• APM 2.6 + Ublox GPS
• Motors: NTM Prop Drive Series 28-26A 1200kv / 286w
• ESCs: Hobby King 30A ESC 3A UBEC
• Prop.: 8.0x4.5 inches
• Batt.: Zippy 4S 4500mAh

I am not using

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