Knut Graf
  • Male
  • Austin, TX
  • United States
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Knut Graf's Discussions

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 Joe Dietrich Jan 9. 22 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

 

Knut Graf's Page

Latest Activity

Knut Graf posted a status
"My take on the FAA's proposed rules for small drones.…"
Mar 2
ramgool commented on Knut Graf's blog post Building a 3DR-B... found a frame orientation issue
"Piepende pocket drone  Zie You tube "
Feb 22
ramgool left a comment for Knut Graf
"Hello Knut GrafI 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…"
Feb 22
Knut Graf commented on Knut Graf's photo
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Pocket Drone & Radio

"It's a good concept, but a bit of a quagmire in practice. The landing gear is flimsy (the pieces break easily, and the pegs just fall off) and after half a dozen successful flights, I did one flight where I switched from Stabilize to Alt Hold,…"
Feb 7
Sean commented on Knut Graf's photo
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Pocket Drone & Radio

"How is the pocket drone so far? i cant get it to work right "
Feb 6
Knut Graf posted photos
Jan 23
Knut Graf posted a video

West Texas Vistas from Knut Graf on Vimeo.

West Texas Vistas

Slow Pans from Enchanted Rock to Marfa: A number of fligts from December 2014, showing Enchanted Rock, places along highway 90, the Big Bend area, and Marfa. Each flight sequence is a slow motion 360 degree pan at altitude: going up and taking a…
Jan 23
Joe Dietrich replied to Knut Graf's discussion 30 minute multicopter flight times, with a camera, in practice ?
"I'm getting 35-40 minute flight time with this build, carrying a 3-axis DYS Gimbal and GoPro Hero 3: Frame:  DJI F550 Top and Bottom Plates / Aeroxcraft X55 extended arms (makes this 650 class) Controller / Autopilot:  Pixhawk with…"
Jan 9
Knut Graf posted a video

Lieser Flight

Have drone, will travel: my home town of Lieser, Germany. Shot with my Hoverthings platform when I was home for the 25 year high school reunion in July 2014. I want to replace the music with something less silly, but iMovie died on me, and won't…
Oct 28, 2014
Knut Graf replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"Fyi - here is quite a bit of spectral response data from MaxMax. Disclaimer: I neither work for nor profit from MaxMax, but I do develop NDVI software."
Oct 28, 2014
Knut Graf replied to Benjamin Meltzer's discussion NIR Camera vs RGB Camera Conversion in the group Agricultural UAVs
"You can get quite far with converted normal cameras - the advantage is that all the r&d that goes into "regular" cameras works of you, if you go that route. If you compare the converted cameras that you get, for example, at MaxMax, to…"
Oct 26, 2014
Knut Graf replied to rockNroll00q's discussion Raw images of corn field from drone for a university study in the group Agricultural UAVs
"If you are still looking for images, please take a look at grafsys.com or my profile here. I can provide you the stitched images there, or raw images. Mostly corn, some wheat & pasture, some with near infrared. I would like to learn more about…"
Oct 22, 2014
Knut Graf posted photos
Oct 14, 2014
Knut Graf added a discussion to the group Baja Drones Group
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Looking for Michael Edwin

The founder of apparently-defunct 3DRInstruct, which turned into UASInstruct. He is listed as living in Coronado. Michael, please get in touch.If you know Michael, please remind him to get in touch.Thank you.Greetings from Texas,Knut GrafSee More
Sep 27, 2014
Knut Graf posted a status
"NormalizerNDVI, for intuitive plant vigor imaging, is in private beta: http://j.mp/1uu1aoG"
Sep 26, 2014
Knut Graf commented on Jeff Taylor's blog post New NGB Filters and Higher Resolution Camera at Event 38
"Thank you. I'm working on an NDVI processing software. Maybe I can build some software presets that take the imaging characteristics of your new filters into account."
Aug 22, 2014

Profile Information

About Me:
Founder, Graf Systems LLC.
I design friendly, useful software, I build and fly drones.
Please tell us a bit about your UAV interest
Do more with less in land stewardship.
Hometown:
Austin

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Knut Graf's Blog

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.…

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Comment Wall (2 comments)

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

Knut,

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

Thanks,

Mike

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

ramgool@gmail.com

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