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

Graham Dyer's Friends

  • Steve Stark
  • pma_
  • Edson Moura
  • Spyros
  • Quadzimodo
  • Tyrell John
  • Riaan Vermeulen
  • Ashur Gelyana
  • MA
  • paul riseborough
  • Byron
  • Shaun Mileson
  • DP Joubert
  • Kevin Hester
  • Darren Orange

Graham Dyer's Groups

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

Nicolas Calderon commented on Graham Dyer's blog post Finwing Air Titan
" Bought  one today guys , the kit version. all  the ready to fly where gone, I liked the skyhunter but i would have to buy /build a landing gear also the Talon. this bird has it and its steerable .should be here by next Wednesday :)))…"
Sep 11

Graham Dyer commented on keeyen pang's blog post FLIR Tau 2 revisit
"Very very nice, and compact too! Funny, we're also using a 320 in an 85mm ball but with only one brushless axis (tilt), the other is a 210° rotation servo, not ideal but really light, our weight is about 210g. Also no concurrent EO but hot…"
Sep 8

Graham Dyer commented on keeyen pang's blog post FLIR Tau 2 revisit
"+1 on the gimbal, Guy, looks great, own design?"
Sep 8

Graham Dyer replied to Richard Kennedy's discussion 2.72 easier to set up than the latest firmware??
"Seek an ye shall find, here's a good place to start:"
Sep 7

Graham Dyer commented on keeyen pang's blog post FLIR Tau 2 revisit
"IR in forest is very difficult, we sometimes can't see elephants under thick canopy, so it's good work finding a marque monkey! A camera that could point at the collar signal could be so useful. 1st prize though is full HD IR that…"
Sep 6

Graham Dyer replied to Mike's discussion Please Help Diagnose A "Beautiful" Crash...
"Click on your name and you will get or be able to add an airframe and a log from there."
Sep 5

Graham Dyer replied to Andrew Van Der Plaats's discussion Drones provide terrorists with Air Force
"Mod note: Odd html editing issue, I've added the link to the article below the image"
Sep 5

Graham Dyer replied to Max LEe's discussion RVJet wants to dive all the time?? in the group ArduPlane User Group
"Yup, presume you've done the 6 sided accel calibration once when you originally set up the Pixhawk then all should be good. I used to have an RVjet and if I recall correctly I needed about 2 or 3mm up reflex on the…"
Sep 1

Graham Dyer replied to Max LEe's discussion RVJet wants to dive all the time?? in the group ArduPlane User Group
"Exactly, but just put AHRS_Y back to zero first before anything else. Adjusting the horn is good practice but if using a computer radio which remembers the trims then just doing the radio recalibration again after the plane is trimmed to fly level…"
Sep 1

Graham Dyer replied to Max LEe's discussion RVJet wants to dive all the time?? in the group ArduPlane User Group
"Once trimmed (most "wings" need some up elevon or reflex) in manual mode you need to do the radio calibration again to recenter the throws that the autopilot uses. And take out the AHRS_Y, set it to 0, this will change by itself after the…"
Sep 1

Graham Dyer replied to Rai's discussion Loiter Problem with low % of compassmot in the group ArduCopter User Group
"One way to check compass orientation is to place the copter outside pointing any direction (lets say pointing east) and after booting and connecting via telemetry (don't move or rotate it) then look at your compass heading, it should show…"
Aug 31

Graham Dyer replied to Staq Koenig's discussion All motors stop suddenly with Pixhawk
"I had exactly the same thing, except mine stopped at 11m high and the damage was fairly substantial, I still have no explanation but what I do have now is a lack of trust."
Aug 22

Graham Dyer replied to Randy's discussion ArduCopter-3.2 beta testing
"My v3.2 rc5 troubles on a Tricopter here: Is this a setup/hardware/software issue?"
Aug 22

Graham Dyer commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Vcc in blue, steady at around 5.01V - 5.16V The pitch scale is degrees (on the left) so it's pitching backwards about 20°. CH4 scale is PWM (on the right) so output spiking to 1930µs."
Aug 22

Graham Dyer commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"I've put a post with my troubles here:, any assistance greatly appreciated."
Aug 21

Graham Dyer replied to Chris G's discussion Airspeed sensor weird issue.
"I'm using a 3DR digital airspeed sensor on a Pixhawk and also have offset (5-7m/s) inside in wind still conditions. Preflight calibration also does not reset it to 0 which it definitely used to a few months back. Doesn't seem to affect the…"
Aug 21

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 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.

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

Graham Dyer's Photos

  • Add Photos
  • View All

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 16 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 (

You need to be a member of DIY Drones to add comments!

Join DIY Drones


© 2014   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service