Hello,
After Arming the board, when trying to take off, the vehicle flipped off instantly. Never it went to hovering mode. After giving 15 % throttle, quad flipped .
This is my configuration.
1. DYS 20Amp ESC
2. KK 2.1 FLight controller with LCD
3. DYS motors with 1000KV, 150W
4. HK Transmitter & Rx, T6A V2 :
http://www.hobbyking.com/hobbyking/s...2_mode_2_.html
5. Nano Tech Lipo 4s, 4500maH, 35C.
6. Props 8x4.5
7. "+" Configuration selected from FC board.
I have checked motor connection, rotation direction, prop direction. It appears to be fine. What could be the reason for it 
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Replies
The KK controller does have orientation considerations.
All the normal checks should be performed:
Any and all these can be mixed up and cause flipping/control loss.
-=Doug
I'm not familiar with the KK flight controller. We had the same thing happen with an APM after one of my students moved a few components around to mount a Go-Pro. What turned out to be the problem is the APM was not pointing toward the front of the quad. It has an arrow on the top that says front. I assume the KK (and you know what assuming is) has a special orientation it must be mounted to know what direction is forward. Just a guess.
Hello any help on the above post