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

Graham Dyer's Discussions

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

Yawing Tricopter

Started this discussion. Last reply by Graham Dyer May 12. 3 Replies


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Mike Feldmann's discussion 3.2-rc3 issue
"Pretty much like that, save your params from v3.1.5 and from v3.2-rcX and then compare them, you'll get a list showing what's different between the two. I use it every time to copy over my chosen PID's and modes between versions.…"

Graham Dyer replied to andy's discussion Quad unstable to take off
"Check while holding the quad firmly and safely and running at half throttle that when you lower one arm of the quad then the motor on that arm should speed up resisting the downward movement. You should repeat with each arm making sure that the…"

Graham Dyer replied to Mike Feldmann's discussion 3.2-rc3 issue
"Have you used the parameter compare function of MP to see what's parameters are different between the two?"
pma_ left a comment for Graham Dyer
"hmmmm I'm connecting via usb, pixhawk soft works that way"

Graham Dyer left a comment for pma_
"Change the serial CTS RTS check to 0"

Graham Dyer left a comment for pma_
"PM me, are you trying to connect with USB or telemetry?"
pma_ left a comment for Graham Dyer
"hi, can you help me with arducopter installation on AUAV-X1? After installation MP cannot connect to board (no mavlink connection) regards"

Graham Dyer replied to Roben's discussion Where is my terminal in mission planner?
"Config/Tuning > Planner > tick 'Advanced View'"

Graham Dyer replied to SkyPirate's discussion APM2.6 Acro mode issue, not holding angle.??????????
"What mode are you flying in?"
Jul 14
David Pulvermacher replied to Graham Dyer's discussion FTDI via bluetooth?
"Hi Jan. Being a complete novice related to APM, I would be very grateful if you could show exactly how you hooked your Bluetooth module up to the APM1. I've got an Ardupilot 2.6...(is that the same thing?) and a JY-MCU Bluetooth Wireless Serial…"
Jul 14

Graham Dyer replied to evil_dan2wik's discussion A couple of questions regarding QuadCopter Parts.
"Rubber is bad as it flexes then vibrates and APM's et al, are very sensitive to vibrations. APC Slow fly props are a good start, buy spares and don't fly near solid objects or people (not so solid). Motors are damaged by high current/high…"
Jul 13

Graham Dyer replied to Marc MERLIN's discussion How to debug circle mode not circling?
"After autotune on level 8: "
Jul 13

Graham Dyer replied to Marc MERLIN's discussion How to debug circle mode not circling?
"I use: Roll: PID: 1.150 / 0.200 / 0.150 (35°) Pitch PID 1.200 / 0.150 / 0.200 (+17°/ -18°) ...which is not perfect but shows how high you can potentially go. This is on a Super Skysurfer at 800W max. I haven't done an Autotune yet…"
Jul 13

Graham Dyer commented on Andrew Tridgell's blog post Advances in airspeed handling
"The pitot tube is a closed system, it does not pass air through it, it just registers the air pressure thus should have no problem in dusty environments. It will only clog if pressed into dirt (or crashed) or obstructed in some way."
Jul 12

Graham Dyer replied to Elios's discussion Logitech Extreme 3D Pro Joystick on a Fixed Wing planes
"Can't say for sure but you should be able to use any normal joystick that is recognized by Windows. Maybe smeone that has used on will be able to confirm. We're using a Logitech Gamepad for gimbal control and it works fine."
Jul 12

Graham Dyer commented on Chris Anderson's blog post Lost drone ads proliferating on Craigslist
" - not for long range though but if you have a rough last GPS position these may find it."
Jul 12

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 professional UAS/UAV/RPAS Pilot.
Please tell us a bit about your UAS 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.

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 35 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 15 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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