Drifting Problem

Dear Members,
Hi
Hope you guys are having a good day. For the past 4-5 weeks I have been working on this QuadCopter using open pilot revolution flight controller. With the help of this great community I figured out a lot of problems which I faced when I first started building my QuadCopter. Until now I am trying to fix some problems my design is facing. Explained below is my design and the problems I am facing in flying. Also attached is some image files, videos I made while testing my QuadCopter and the UAV file I used. The videos I made shows how my Quad is behaving.
Please have a look and suggest me where I need to focus more to fix this problem and achieve success.

Design

Frame : Quanum Vneture FPV QuadCopter
Frame size: 430 mm
Weight: 440 gram
Prop size: 10x4.7
Motors: 2213 935KV Multistar motors
ESCs: Afro 20 A
Flight controller: Open pilot revolution 
Battery: LiPo 3000 mAh 3S
GPS: Open pilot V9
GCS: 15.05.2 release
TX/RX: Turnigy 6-channel

Problems

1. Lift is not smooth. Lift must be a nice smooth and stable lift
2. Vertical descend is not smooth either. It goes above very fast and then come down very fast like there is not enough thrust from the motors.
3. On increasing throttle with roll and pitch at neutral point quad is drifting as can be seen in the videos. Also it rolls and pitches at a high speed which is uncontrollable.
4. After throttled first it lifts then with time like within less than a second it starts drifting.

Regards
muscles

https://youtu.be/KpL7cTafgss

https://youtu.be/pXCd2rrn2yw

Basic Generic Quad X + Sensor.zip

QV_Stud_031.jpg

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