Graham Dyer
  • Male
  • RPAS Pilot - Johannesburg. (ex-Safari Trails Guide)
  • South Africa

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Graham Dyer's Groups

Graham Dyer's Discussions

APM:Plane, odd warning sound - no messages?

Started this discussion. Last reply by Grant Morphett Aug 9, 2015. 18 Replies

APM 2.5 suddenly lost ability to connect via USB or Telem

Started this discussion. Last reply by Pavel Sorejs Feb 9, 2015. 1 Reply


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Chris Morin's discussion Pitch oscillation on Auto
"^^^ what the master said :))"
May 16

Graham Dyer replied to Chris Morin's discussion Pitch oscillation on Auto
"Some ideas as I had a similar problem: - make sure your elevator is absolutely slop free. - P and I seem a bit low, how big is your elevator? - do you have enough elevator movement? - have you done an autotune and at what level? - where is your…"
May 15

Graham Dyer replied to Sevyon's discussion uploading waypoints automatically to UAV while it is in air
"Normally, you can only send a complete set of new waypoints while the vehicle is in the air and to execute those new waypoints you have to hit "restart mission" while in auto or just before entering auto. You can send one at a time but…"
May 14

Graham Dyer commented on Greg's blog post Drone hit British Airways plane approaching Heathrow Airport
Apr 26

Graham Dyer replied to Doug's discussion MAVLINK announcment
Apr 22

Graham Dyer replied to Randy's discussion PixRacer with Ardupilot
"@Edgar: Micro MinimOSD should work fine, really small, cheap, fairly robust and all the features of MinimOSD. You can parallel it with telemetry if needed."
Apr 22

Graham Dyer replied to Doug's discussion MAVLINK announcment
"I too, would definitely like to be able to turn this off!"
Apr 21

Graham Dyer commented on Andrew Tridgell's blog post APM:Plane 3.5.2 released
"Is anyone trying a VTOL tail sitter with 2 motors?"
Apr 20

Graham Dyer commented on Greg's blog post Drone hit British Airways plane approaching Heathrow Airport
"A London-based drone enthusiast is to sue Heathrow airport for flying a passenger jet right through his toy. Simon Williams, 35, said the drone was his pride and joy, and the best eight-hundred pounds he’d ever spent, until a British Airways…"
Apr 18

Graham Dyer replied to John's discussion What Flight controller to get
"The Pixracer is 100% Pixhawk/Ardupilot compatible, it's a very good Pixhawk replacement and it's not a clone. Here is a video of mine flying one of it's predecessor the X1 (uses the same firmware - Arducopter v3.x), it's very…"
Apr 17

Graham Dyer replied to Brian Buckmaster's discussion Terrible Endurance Flight Time in the group ArduCopter User Group
"Adding my 2c to what others have said: those batteries cannot handle the current demanded by your system at it's current weight. A battery's voltage drops under load depending on type, quality, load, temperature and age. For a 3 cell pack…"
Apr 17

Graham Dyer commented on Roger Monongo's blog post High efficiency mapping missions for low budget projects with less than 60 euros equiment
"Very good, thank you, so much valuable information!"
Apr 12

Graham Dyer replied to Gabriel DeVault's discussion Alt and heading stabilization while banked?
"No, not autonomously without code modification, I think. This is flying "knife-edge" which most non-aerobatic auto-piloted aircraft try to avoid. If you forced the rudder one way the aircraft will crab sideways as the AP will always try to…"
Apr 9

Graham Dyer commented on Chris Anderson's blog post Anyone remember UNAV?
"Are there any figures/graphs showing popularity or usage of the various autopilots out there, commercial and/or hobby?"
Apr 9

Graham Dyer commented on Martin Hill's blog post RC Airship as Drone
"I did some research on these 3 years ago with the idea of using it for a specific project, found some 5m, 6m or 8m, etc, long versions in the far east that could handle 45km/h winds (critical for this project), could carry a reasonable payload and…"
Mar 30

Graham Dyer replied to Richard Sterling's discussion Lights &, joystick mapping in the group ArduRover User Group
"Hi Richard, you can see your servo IN's (#) and OUT's in the status window, anything non-zero is getting it's value from the RC Rx or are assigned in the Joystick window, this is mine with nothing connected: CH1-8 show OUT values and…"
Mar 30

Profile Information

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

Now I'm a RPAS Pilot working on various projects. BVLOS mostly, day and at night. 320 hours logged and 14668km as of end Mar '15. Did 114km total distance in one flight 2014, as well as 02h17m with a 3kg electric plane.
Please tell us a bit about your UAV interest
Personal: DIY Carbon H-frame QuadCopter with 250+ flights, APM2, 3DR Telemetry, Sunnysky X2212-980 motors, 11x4.7 carbon props, 2200/5000mAh 3S Turnigy Batts, 15 minute flight time, Sony 520TVL camera, 1.2GHz 700mW Video Transmittor + inverted Vee antenna, Video goggles & 9" Dvd monitor.

DIY FPV folding carbon Tricopter - XUAV-X2 (AUAV.CO) powered (300mm width, 3DR Telemetry, Sunnysky X2212-980 motors, 10x4.7 carbon props, 2200/5000mAh 3S batts

Twin boom FPV 1.75m plane for long distance Nav & FPV. APM2.6, 60+ flying hours.

Old: Own design & built twin-boom UAV Plane (R.I.P.)
ArduPilot v2.7.1, ArduIMU, MediaTek GPS. Had clocked 70+ hours flying time.

Slowstick - ArduPilot Legacy v2.6.2, APM2560 + Thermopiles, was used for FPV and as a stabilized trainer.
Randburg, Johannesburg, South Africa

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Graham Dyer's Blog

RC Electric Calculator App for Android

Posted on September 3, 2015 at 12:54am 17 Comments

RC Electric Calculator App for Android - version 3.0 is coming out shortly with many improvements and some calculations…


Prop testing on a 'copter

Posted on April 18, 2014 at 9:43am 18 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 14 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…


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, Vikram said…
have u got success in reversing ur aileron ... i m using same setup with XY sensors
At 2:12am on August 21, 2009, Vikram 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, Vikram said…
so u must have tried #define ROLL_REVERSE 1 , then nothing happened ... am i right..
At 3:08am on August 21, 2009, Vikram 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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