Graham Dyer
  • Male
  • UAV/UAS Pilot - Johannesburg. ex-Trails Guide, Mala Mala Game Reserve,
  • South Africa
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Graham Dyer's Discussions

"Fly to here" in Cruise Mode?

Started this discussion. Last reply by Graham Dyer Aug 11. 2 Replies

Attopilot 45A sensor, incorrect readings?

Started this discussion. Last reply by Graham Dyer Jun 4. 1 Reply

Quad descends in Loiter but not in Alt_Hold?

Started this discussion. Last reply by Graham Dyer May 24. 3 Replies


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Joe's discussion Tricopter spin.
"Sorry, if you tilt forward at half throttle the rear motor should slow down and the front two should speed up but anyway you should have some change. I'm not sure what the problem is, but it may be worth checking all the steps again to see if…"

Graham Dyer replied to Joe's discussion Tricopter spin.
"The firmware is fine, my tricopter flies like a dream.  You obviously have checked the motors/props are turning the right way? BTW, always test without props (at least initially) in case something is wrong. Try this: the throttle needs to be…"

Graham Dyer replied to Joe's discussion Tricopter spin.
"They're small but there's a small black servo indicated on the image below motor 4 and below CH7 on the APM. Hang in there, tricopters are great fun to fly, I much prefer them to any other multirotor, the tail feels very locked in and…"
Oct 26

Graham Dyer replied to Joe's discussion Tricopter spin.
"Joe, it's not 100% clear on the wiki and the diagrams are ridiculously small so its an easy mistake to make. About half way down this page the diagrams are clearer: A tricopter…"
Oct 26

Graham Dyer replied to Joe's discussion Tricopter spin.
"Sorry to break this to you but a tricopter MUST have a servo and mechanism for yaw control, unless it is a Y6 of course, but you say yours is a tricopter with 3 motors. Only a quadrotor or greater can yaw using the power (or torque) of the…"
Oct 26

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
Oct 26

Graham Dyer replied to Joe's discussion Tricopter spin.
"Where is your tail servo plugged into?"
Oct 26

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Same thing happened to me, crash after motors just stopped, with the the logs truncated. Almost identical to the two above."
Oct 26
james johnson commented on Graham Dyer's blog post Finwing Air Titan
"I have one and I really love it. It's rugged and flies like a dream. I run 2 6S 8000's and one 3S 8000 for electronics. I actually have two of the planes, one has been modified as a true taildragger by removing the nose wheel and moving…"
Oct 23

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Randy, I tried an Auto mission but it was awful, mission height was 20m but the quad zoomed up to 60m by the 3rd waypoint after flooring the throttle. It seems that if my z-vibrations deviate slightly the quad goes completely out of control…"
Oct 21

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Thanks Randy, is there anything else I can do to mitigate this type of occurrence? Have had a few flights now with different damping mounts for the Pixhawk with no problem so far but would really like to avoid a re-occurrence, not good for my heart…"
Oct 21

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Motors seem OK so far, how would I check for sync issues? The vibrations before and after are well within limits, just that weird section. I'm also trying different Pixhawk mounting insulation to see if there's a difference."
Oct 21

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Throttle spike after vibration. Just had an unnerving uncommanded full power climb which seems vibration related: Would EKF catch this king of thing or is there another safeguard? Not sure why I suddenly got vibration, resonance between…"
Oct 20

Graham Dyer commented on Adrián Nagy Hinst's blog post ArduPilot AntennaTracker code - initial testing
"Does anyone know where we can get v0.1 of this firmware, as v0.2 is not working for us? Previous firmware in MP only loads v0.2."
Oct 20

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"Could someone please check if "Change Alt" works in Auto and while in Loiter/PosHold? I haven't loaded v3.2 yet but want to make sure this is working correctly. "
Oct 19

Graham Dyer replied to Dylan Eave's discussion Flight with Telemetry Only
"You'll need the Mission Planner for at least the first part, to load the mission, arm the copter with the 'Arm' button and change to Auto, (having set a takeoff command in your mission). Meticulous setup and exhaustive testing will be…"
Oct 18

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.
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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