John Stuart
  • Male
  • Cape Town, Western Cape
  • South Africa
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John Stuart's Groups

John Stuart's Discussions

A week of Arducopter misery

Started this discussion. Last reply by Gustav Kuhn Sep 22, 2011. 28 Replies

After a week spent working on my Arducopter 2, I have still failed to get it airborne and I've broken two props already. In the interests of other people avoiding the misery I've  had to go through,…Continue

Roll gyro feedback inverted

Started this discussion. Last reply by John Stuart Sep 6, 2011. 2 Replies

This is my second issue with my AC2. My previous post 'GPS prevents motors arming' describes the history of my AC setup problems.This issue relates to the flight data feedback received in APM…Continue

GPS prevents motor arming/booting

Started this discussion. Last reply by John Stuart Sep 6, 2011. 2 Replies

Hi forum, I'm a relative newbie in that although I bought my AC about 6 months back, I've only now started working on it.Problem: with GPS connected my AC2 won't arm the motors/boot properly. As soon…Continue

 

John Stuart's Page

Latest Activity

John Stuart replied to andresiko's discussion trigger a camera shorting 2 wires via pixhawk
"Have you checked this guy's products out? He has two that are soldered to the shutter button, one with focus and shutter, the other with just shutter. Also an IR option but that has too much latency I…"
May 24
John Stuart commented on Olivier's blog post No Parachute? No problem! (There’s an app for that)
"This is brilliant! Well done on a new clever failsafe"
Apr 14
John Stuart commented on Chris Anderson's blog post Pixhawk-powered ornithopter
"Fantastic idea and execution - would love to buy one!"
Jan 18
John Stuart commented on Colin Snow's blog post CropLife Survey: 87% of Ag dealers using UAVs are not generating a profit or don't know
"Maybe multi-spectral ag products from drones are under threat from satellites, but not basic hi-res crop scouting, live video surveillance of livestock, inspection (eg drainage) and security applications. Those products have a bright future."
Jun 15, 2015
John Stuart commented on Jeff Taylor's blog post Event 38 Mission Planning & Mapping Workflow Updates
"Great innovations, thank you for sharing!"
May 21, 2015
John Stuart commented on Christiaan van Vollenstee's blog post South Africa signs new drone rules into law
"Just picked up from Hennie Kieser's interview on Jacaranda FM: cost for licenses are expected to run to R150 000 (about $12000) as CAA expects to charge R600 per hour while vetting our documentation. Are we all still thrilled about these new…"
May 20, 2015
John Stuart commented on Christiaan van Vollenstee's blog post South Africa signs new drone rules into law
"Compare these regulations with those of Canada, the UK or Australia - they are significantly more draconian. Do you know you'll need annual audits, license renewals (biennial in the case of the RPL), four different certifications/licenses…"
May 20, 2015
John Stuart commented on Randy's blog post ArduCopter 3.2 Released
"Nope, ESC calibration is under setup, not motor sync. It has disappeared."
May 6, 2015
John Stuart commented on Randy's blog post ArduCopter 3.2 Released
"Has the motorsync test been removed? I can't find it in the CLI"
May 5, 2015
John Stuart commented on Bertrand Duchiron's blog post Unmanned : Textbook for UAS studies, a short review
Apr 29, 2015
John Stuart commented on Dave Giles's blog post Drone delivering asparagus to Dutch restaurant crashes and bursts into flames
"Agree with Daniel, that is a low C battery, overload it and you're looking for trouble"
Apr 15, 2015
John Stuart commented on Mark Williams's blog post Using UAVs and NIR photography in conservation land cover classification
"Great work Mark, I've been looking for a good example of drone-imagery plant classification and I think this is one."
Apr 8, 2015
John Stuart commented on moglos's blog post Be careful with LiPos
"I use a converted metal post box. I've noticed metal boxes have become really expensive if you buy them new, so converting something you already have is a cheaper option."
Mar 30, 2015
Alexander replied to John Stuart's discussion Drone NDVI for Plant Nutrition Testing in the group Agricultural UAVs
"Hey John-  Really, thanks a lot for posting this image set for me. It will be of great use in my class- I really appreciate it!  Alex"
Mar 26, 2015
John Stuart replied to John Stuart's discussion Drone NDVI for Plant Nutrition Testing in the group Agricultural UAVs
"Hi Alexander, thanks for the feedback. I generally don't make 4 band composites but I have attached the NRGs for the relevant areas of the images. Hope they can be of use. BTW this is a 50% resize using nearest neighbour, whereas the NDVIs…"
Mar 25, 2015
Alexander replied to John Stuart's discussion Drone NDVI for Plant Nutrition Testing in the group Agricultural UAVs
"Hi- Thanks for your great article. Would you be able to provide the raw 4-band stack image so I can try my own VNIR indices on it? This is for a class. Thanks  Alex"
Mar 24, 2015

Profile Information

About Me:
I am an economist with a special interest in food security and agricultural productivity enhancement. I've also worked as a Business Analyst and Systems Analyst and I designed a niche governmental performance system. In my spare time I enjoy hang gliding and, when I'd rather not fly myself, I fly one of my RC planes or multicopters.
Please tell us a bit about your UAV interest
UAVs are a very exciting area to me, not least because they are cutting-edge, combine aviation, development and analysis. In Africa, starvation is all too real and I see UAVs as a cost-effective way of enhancing agricultural productivity.
Besides their role in helping to obtain high resolution multi-spectral imagery, UAVs can also assist with land mapping, which can contribute to optimum land use policy.

In September 2014 we launched our agricultural drone:
http://www.agridrone.co
Hometown:
Cape Town

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Comment Wall (2 comments)

At 7:54am on October 28, 2013, LanMark said…

well, hello.

At 9:28am on October 28, 2013, Deon van der Merwe said…

John, I'm glad to meet you, even if only virtually at this stage.  I am from SA, but live in Kansas now. We do research on UAV-based vegetation analysis, and I'd like to know more about your experiences looking at vines etc. Maybe I will see you one day when visiting SA. I go there at least once a year. Missing the place terribly!

Deon

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