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  • Dave C
  • Jeff Taylor

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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 JD Jul 3. 21 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 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…
Wednesday
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."
Wednesday
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…"
Monday
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
Knut Graf posted photos
Oct 14
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
Knut Graf posted a status
"NormalizerNDVI, for intuitive plant vigor imaging, is in private beta: http://j.mp/1uu1aoG"
Sep 26
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
Knut Graf commented on Jeff Taylor's blog post New NGB Filters and Higher Resolution Camera at Event 38
"Do you happen to have any sample images that show commercial crops, such as a corn field ? Thank you, Knut"
Aug 22
DAVE BEHR commented on Knut Graf's photo
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300 Acres of Corn.

"HI Graf' Which modules do you install for the Airphoto SE ? It seems they stopped support from April 2014. Thanks."
Jul 24
DAVE BEHR commented on Knut Graf's photo
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P4220051

"Thanks, Do you point to this image:? http://diydrones.com/photo/p4220051?context=user Do you use CHDK for the Camera , or trigger the Camera in a different way ? "
Jul 22
Knut Graf commented on Knut Graf's photo
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RVJet in progress

"Look at the pictures."
Jul 22
DAVE BEHR commented on Knut Graf's photo
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RVJet in progress

"Hi Knut, I am looking into RVJET, and want to install a camera, so as to take stills in the -90 deg. direction (Nadir). Do you have or know of such an installation for the camera (I have a Canon S100) ?. Thanks"
Jul 22
JD replied to Knut Graf's discussion 30 minute multicopter flight times, with a camera, in practice ?
"that's 2 X 6S 10,000 mAH?  Which frame are you using on X8 "
Jul 3
David Pawlak replied to Knut Graf's discussion 30 minute multicopter flight times, with a camera, in practice ?
"I've made an X8 for redundancy that runs 27 min on 20,000mAh. Weighs 5Kg with a Nikon L610 and 2 axis gimbal, video Tx and telemetry Hovers at about 40% 8 x Multistar 4820 pancakes 690kv, 15x8 APC E props "
Jul 3
Shouyeh Gong replied to Knut Graf's discussion 30 minute multicopter flight times, with a camera, in practice ?
Jul 3

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 4 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.…

Continue

Comment Wall (1 comment)

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

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