Graham Dyer
  • Male
  • UAV/UAS Pilot - Johannesburg. ex-Trails Safari Guide, Mala Mala Game Reserve,
  • South Africa
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Latest Activity

Graham Dyer replied to Ronen Aknin's discussion mission planner for android
"Not going to happen, Droidplanner or Andropilot ( is the closest you can get at the moment, with it you can set/read/calibrate/test."

Graham Dyer replied to Dave's discussion Planner's algorithm between waypoints
"Some info here: Try a search as there's a lot more info if you dig a little."

Graham Dyer replied to Ronen Aknin's discussion mission planner for android

Graham Dyer replied to Ronen Aknin's discussion which is the most stable firmware for theb apm 2.6 mega
"1. You can load either, 3.2 is a big step forward, 3.2 is like Win7 over Vista 2. Yes 3."

Graham Dyer commented on Arthur Benemann's blog post DroidPlanner 2 - Official Stable Release
"Perhaps I'm being a little stupid here but how do you save a changed parameter? After changing a parameter I have this screen: If I exit this screen the parameter is not saved and there's no save or write button so is there some magic…"
Dec 13

Graham Dyer replied to Michael Hadsell's discussion Understanding Altitude setting for APM and Mission Planner
"Thanks, that makes things clearer."
Dec 7

Graham Dyer replied to Michael Hadsell's discussion Understanding Altitude setting for APM and Mission Planner
"Does 'Terrain' waypoints do the same as the 'verify height' checkbox, if not what's the difference?"
Dec 7

Graham Dyer commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Thanks Nick, will try that"
Dec 6

Graham Dyer commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Is there any way to stop the incessant beep on start up?"
Dec 5

Graham Dyer posted a discussion

Spin on/quick release prop adapters?

More and more RTF 'çopters are coming out with spin on prop adapters or even spin on props (DJI, et al).The idea is no nuts or other tightening methods, the prop adapter spins onto the threaded shaft and self tightens due to the rotation of the motor.…See More
Dec 3

Graham Dyer replied to testuser0001's discussion External Compass direction
"Reboot and redo compass calibration after changing compass orientation. Also check your declination is correct for your location. A small variation in direction is OK, ie 5-10°."
Dec 1

Graham Dyer replied to Niv Behar's discussion is there any thing similar to Roi mode in Arduplain?
"Short answer is no. Target tracking is not yet implemented into APM:Plane, it requires collaboration between the gimbal and the APM. ROI in Arducopter uses the copter yaw to track the target."
Dec 1

Graham Dyer replied to zheng jishi's discussion Problem in pitch shake
"Try increase your Pitch_I to 10% of P (so make it at least 0.120). Also make sure there is absolutely no slop in your elevon linkages"
Dec 1

Graham Dyer commented on Team Tiltrotor's blog post Prototype Tiltrotor Development using APM 2.5
"Amazing, lots of respect in achieving what you have so far. Up the VTOL!"
Nov 28

Graham Dyer commented on Andrew Tridgell's blog post APM:Plane 3.2.0 released
"Jake, check COMPASS_EXTERNAL is 1, Pixhawk detects it automatically whereas APM needs that to be set."
Nov 26

Graham Dyer commented on Randy's blog post ArduCopter 3.2 Released
Nov 26

Profile Information

About Me:
I worked as a Safari Trails Guide (Lead Rifle) and Ranger and guide in the South African Wildlife Tourism Industry for about 20 years.

Now I'm a professional UAS/UAV/RPAS Pilot. I fly drones 40-120km, both at day and at night, 7 days a week on a special project. 120 hrs and 4673km as of end Nov '14.
Please tell us a bit about your UAV interest
DIY Carbon H-frame QuadCopter with 200+ flights (25+ flying hours), APM2, 3DR Telemetry, 20-22L motors, 12x3.8 carbon props, 5000mAh 3S Turnigy Batts, 15 minute flight time, Sony 520TVL camera, 1.2GHz 700mW Video Transmittor + inverted Vee antenna, Video googles & 9" Dvd monitor.

New carbon Tricopter

Twin boom FPV 1.75m plane for long distance Nav & FPV. ArduPilotMega1 v2.65, 4+ flying hours.

Old: Own design & built twin-boom UAV Plane (now RIP)
ArduPilot v2.7.1, ArduIMU, MediaTek GPS. Had clocked 50+ hours flying time.

Slowstick - ArduPilot Legacy v2.6.2, Thermopiles, Used for FPV and as a stabilized trainer.
Randburg, Johannesburg, South Africa

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Graham Dyer's Blog

Prop testing on a 'copter

Posted on April 18, 2014 at 9:43am 16 Comments

I wanted to do a few real world hover tests with different prop sizes to satisfy my curiosity.

I tested 3 sizes of some commonly used props, the RCTimer Carbon 10x4.7, 11x4.7 and 12x3.8, all carefully balanced. There are other very similar props branded differently.

The 'copter is a carbon…


ArduPilot formation flying revisited

Posted on April 14, 2014 at 11:29pm 10 Comments

Further to our first attempts at fully automated formation flying (see…


Another 100km+ flight

Posted on February 11, 2014 at 4:00am 33 Comments

Went for our long distance flight attempt today, flew a test flight with a 6S 2600mAh LiPo and then put in the 18650 batteries in, the log unfortunately shows both flights as I forgot to reconnect so I have calculated the time and total distance from the launch of the second flight to the…


Finwing Air Titan

Posted on February 6, 2014 at 11:30am 17 Comments

Looks like a good fpv/camera ship for long distance flights with…


ArduPilot formation flying attempt

Posted on January 7, 2014 at 1:00am 12 Comments

We tried some formation flying with 2 different APM equipped planes.

Both were loaded with AP v2.76 and the same exact mission except for the chase plane flying 20m higher than…


Comment Wall (16 comments)

At 5:52am on July 24, 2009, Robert Hannaford said…
Hi Graham,

Please give me aring when you get a chance, Rob Hannaford 011 781 4029, 0733000337
At 5:43am on August 20, 2009, viky said…
have u got success in reversing ur aileron ... i m using same setup with XY sensors
At 2:12am on August 21, 2009, viky said…
i think i can correct it but want a clear view ur ailerons r reversed in automode or manual mode. If its auto change is to be done in the code else it has to be reversed using RC remote... let me know whats exactly it is
At 2:40am on August 21, 2009, viky said…
so u must have tried #define ROLL_REVERSE 1 , then nothing happened ... am i right..
At 3:08am on August 21, 2009, viky said…
actually the same problem i had faced but my elevator movement was reversed
in autopilot so i tried to correct it by #define PITCH_REVERSE
but nothing happened later i found thaT this header is not at all used inside code so i just follow the logic in code and got the line to reverse the motion of either aileron or elevator in ... void pulse_servos(int roll, int pitch) //Normal mode
pulse_servo_2(90-pitch); //invert sign if you want to reverse the servo...

This is what i had changed then to work it well.
I did few tests and got semi success in few , hopefully i can make it this time atleast 80% success with little changes in trim as u recommended in ur blog failure and success.
Its very nice blog i will try to write the one ... it really helps ourselves and others
At 2:49am on August 24, 2009, Garth said…
Graham please contact me
021-7827148 or 0827708200

At 4:41am on March 11, 2010, Cronselaar said…
Hi, this must sound stupid, but how do you get the nice line logs in GE... My current position just constantly changes. I'm using a E406. I can't seem to get the right altitude data in the GS2 either.. Any help would be appreciated.

At 9:58am on August 17, 2010, Robert Hannaford said…
Hi Graham, won't you please send me you cell no I have lost it, Regards Rob Hannaford

At 8:08am on October 17, 2011, bruno voisin said…

Hi Graham, this is Bruno from Cape Town. 

These are my first steps in the UAV world, and I am interested in building a ArduCopter to conduct game counts in a nature reserve.  Any advice / recommendation would be most appreciated.

Thanks in advance,

At 1:31am on November 7, 2011, Robert Dielenberg said…

Hi Graham,

we're developing a UAV here in Newcastle, Australia. We've been experimenting with the ardupilot 2_7_1 for a few months. Having huge problems with altitude hold and throttle. We're using a petrol engine. We realize the original ardu is for electric. It seems there is not much data on petrol engines for ardu. We had a crash last week and lost the plane. We're going to rebuild the code from scratch and simplify it. Will get back on to you on our progress. Cheers,


Rob Dielenberg, MotMen UAV (

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