Knut Graf
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  • Austin, TX
  • United States

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Be sure to count your waypoints...

Started this discussion. Last reply by Gary Mortimer Dec 24, 2013. 1 Reply

During a mission yesterday, my copter hit the first four waypoints, and then kept moving in the same direction, instead of turning towards the next waypoint. I watched it for a while and then brought…Continue

30 minute multicopter flight times, with a camera, in practice ?

Started this discussion. Last reply by Joris Jun 25, 2015. 23 Replies

I am wondering if anyone is flying a platform that achieves 30 minutes flight time in practice, while carrying a small camera.The Phantom 2 Vision is close, at 20 to 25 minutes from a 5200mAh…Continue

Could use log analysis help.

Started this discussion. Last reply by Knut Graf Oct 21, 2012. 12 Replies

I did two flights today. One manual flight in stabilize mode, going into a loiter, back to stabilize, to RTL,and then landing in stabilize. Everything behaving as expected.Then a second flight, with…Continue

Side effect when using Ch6 Tuning

Started this discussion. Last reply by Knut Graf Aug 26, 2012. 4 Replies

While doing channel-6 tuning for 2.7.1 with Mission Planner 1.2.8 and 1.2.9, I found the following behavior:In the Arducopter Config screen, when clicking "Write Params", the parameter that is…Continue


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About Me:
Founder, Graf Systems LLC.
I design friendly, useful software, I build and fly drones.
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Do more with less in land stewardship.

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Building a 3DR-B... found a frame orientation issue

Posted on May 12, 2012 at 7:51pm 5 Comments

After putting the copter together over a few exciting evenings, initial test flights showed some very strange control responses with pitch and roll being swapped. I could "correct" this by swapping my Aileron and Elevator receiver channels, but that made the autopilot's stabilization input completely unpredictable. I checked my wiring and documentation, and found the following:

The PDB that comes with the 3DR-B is oriented to use rotor 2 and 3 as the quad's front in x-mode.…


Comment Wall (2 comments)

At 2:10pm on April 29, 2012, FireFlyer451 said…


Still available, the APM is yours if you want it. Paypal is just fine, my paypal email is: .  Send me your mailing address and I'll get it in the mail to you ASAP.



At 9:05am on February 22, 2015, ramgool said…

Hello Knut Graf
I am a Dutchman and bought a pocket drone but this does not work, I found your name on the forum and want your questions or do you know how I can get things to work.
I send a video with you so you can hear what he is doing and that's just squeak.

In sofar thanked 

Raymond van Gool

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