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

Graham Dyer's Friends

  • ChavAnd
  • Yan Ma
  • Steve Stark
  • pma_
  • Mike
  • Edson Moura
  • David Pulvermacher
  • Spyros
  • Quadzimodo
  • Tyrell John
  • Riaan Vermeulen
  • Ashur Gelyana
  • MA
  • paul riseborough
  • Byron

Graham Dyer's Groups

Graham Dyer's Discussions


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Jacques Eloff's discussion Question - Recording of Home Point on Powering Up in the group ArduPlane User Group
"As I understand it the firmware won't allow arming without a solid 3D GPS lock, this can take some time when moving to a new location. The little button cell on the GPS is there to do a warm start so that the GPS normally finds it's…"

Graham Dyer commented on keeyen pang's blog post 100KM Challenge
"Well done! Welcome to the club :)"

Graham Dyer replied to leonardthall's discussion Calling all Tri-Copter pilots
"Wow, so does that mean all tricopters have had their throttle limited to 80% and have no stability patch?"

Graham Dyer replied to Randy's discussion Copter-3.3 beta testing
"The 80% rule applies to capacity, not c-rate ( and has been a long standing recommendation to make LiPo's last. The main rational behind it is that each cell in a pack discharges at a slightly…"

Graham Dyer replied to Gerard's discussion Ardupilot Mega - 2011 Can I still use it?
"OK, that's an APM 1.4, the oldest of the hardware that "can" run the newer firmwares. I use one of those in a plane and it works fine, it won't work quite so well in a copter but will work with some mods. The compass (the small…"

Graham Dyer replied to Gerard's discussion Ardupilot Mega - 2011 Can I still use it?
"Newer hardware will usually improve flight behaviour as there are some features and capabilities that are taken advantage of in the latest firmware. EKF is one of them which is not available to the APM 2.x series. The older boards still perform…"

Graham Dyer replied to Gerard's discussion Ardupilot Mega - 2011 Can I still use it?
"Yes you can but not v3.3 for Copters, APM 1.4, 2.0, 2.5, 2.6 can all run the aircraft firmware up to current and the copter firmware up to v3.2.1. Post a photo and we can tell what version yours is."

Graham Dyer replied to Mat Holzschuh's discussion APM Tricopter issues, plz help???
"Sounds like your yaw ESC or channel is not calibrated the same as the others, all the motors should all start up at exactly the same time otherwise something is wrong, don't try fly until this is fixed. A log and a photo or diagram of how…"
Aug 26

Graham Dyer replied to Noah Dalton's discussion Drone Clearing Snow off Solar Panels
"...but a lot less fun"
Aug 26
Håvard Jakobsen replied to Graham Dyer's discussion MinimOSD alternatives for APM?
"I know this is an old thread, but after bricking I couple of minimOSDs I was wondering the same thing. It seems there is an alternative IMHO the setup software doesn't look…"
Aug 25

Graham Dyer commented on robert mcintosh's blog post Finally, video stabilization software that actually works!
"No, 32 bit, maybe that's the problem?"
Aug 23

Graham Dyer commented on robert mcintosh's blog post Finally, video stabilization software that actually works!
" Downloaded the demoInstall.msi but I get the following error: It's on a Win7 machine with a quad core Intel processor with 4GB of RAM. "
Aug 22

Graham Dyer replied to Noah Dalton's discussion Drone Clearing Snow off Solar Panels
"Yes that would work much better with so much less weight to carry. Not sure how safe it is to have a 1lb propane tank up on the MR but probably not much more risky than using it in the garage. You'll have to figure out a safe, reliable…"
Aug 20

Graham Dyer replied to Noah Dalton's discussion Drone Clearing Snow off Solar Panels
"The problem as I see it would be to carry the power source for the 500W or whatever required to heat the panel for the time required to melt the snow. A drone has the capability to hover over the spot fairly accurately for 10 minutes or more, you…"
Aug 20

Graham Dyer commented on Graham Dyer's group South African DIY Drones User Group
"Anyone in this group doing the first RPL licenses in SA?"
Aug 20

Grant Morphett replied to Graham Dyer's discussion APM:Plane, odd warning sound - no messages?
"In the last release of Plane we made throttle arming default to on.  Its in the release notes which can be seen here. Pressing the safety button is the first of 2…"
Aug 9

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 RPAS Pilot. I fly drones 40-120km, both day and at night, 7 days a week on a special project. 320 hrs and 14668km as of end Mar '15.
Please tell us a bit about your UAV interest
DIY Carbon H-frame QuadCopter with 200+ flights (40+ flying hours), 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 googles & 9" Dvd monitor.

DIY FPV folding carbon Tricopter - XUAV-X1 (Arsov) powered (300mm width)

Twin boom FPV 1.75m plane for long distance Nav & FPV. APM2.6, 20+ 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, was 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 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 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 (

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

Join DIY Drones


DIY Drones Monthly


Season Two of the Trust Time Trial (T3) Contest 
A list of all T3 contests is here. The current round, the Pylon Race, is here

© 2015   Created by Chris Anderson.

Badges  |  Report an Issue  |  Terms of Service