Graham Dyer
  • Male
  • UAV/UAS Pilot - Johannesburg. ex-Trails Safari Guide, Mala Mala Game Reserve,
  • 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 Graham Dyer 23 hours ago. 4 Replies

Spin on / quick release / self locking prop adapters?

Started this discussion. Last reply by Michael Visser Jan 25. 5 Replies


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Graham Dyer's discussion APM:Plane, odd warning sound - no messages?
"Anything further on this? I still can't find an explanation for these sounds coming from the Pixhawk although I'm fairly sure it's something to do with the RC radio signal."
23 hours ago

Graham Dyer replied to Scott Penrose's discussion APM Planner / Mission Planner Keyboard Keys
"Also CTRL-S writes parameters to the APM and CTRL-F = Find (if parameter page is active). Consider opening an issue here with a list of shortcuts you'd all like to see."

Graham Dyer replied to Bartek Sad's discussion Bad AHRS - Pixhawk
"We started getting this and a reboot usually sorted it out however a 6 way gyro/accel re-calibration seems to have fixed it properly."

Graham Dyer replied to Jon's discussion NCR18650B Batteries cutting out on tricopter even with low current
"Also, 18650b cells have a lower voltage under load than LiPo cells, I run 4S to get a (high) 3S voltage under load."
Mar 21
Patrik Carlsson replied to Graham Dyer's discussion Killed my APM2, what component is this & worth trying to repair?
"Hi Vincent! I'm aware of this being a pretty old topic, but I really need help with a very similar problem to what you had in this post. The 10pin IC (TS5A23257?) on my ReadyToFlyer 2.8 blew up yesterday (and maybe other ICs too) for absolutely…"
Mar 21

Graham Dyer replied to Shebin Thazheleth's discussion Brushless motor low mass and low KV
"They do have low C value so must be used in parallel to stay in within 2C so about 6.8A max per parallel cell. They are robust cells, can take some abuse and are safer and lighter than equivalent LiPo's, commonly used in laptops and electric…"
Mar 14

Graham Dyer replied to Shebin Thazheleth's discussion Brushless motor low mass and low KV
"Lots of info on the 'net, you can search for "duration quadcopter". For maximum duration the use of NCR18650b batteries is almost mandatory in the right combination of series and parallel. Light weight of all components is the way to…"
Mar 14

Graham Dyer replied to Bartek Sad's discussion Bad AHRS - Pixhawk
"Starting to get this too, sometimes a reboot helps other times not. Did you ever solve this?"
Mar 12

Graham Dyer replied to Graham Dyer's discussion APM:Plane, odd warning sound - no messages?
"Tridge, raising RC3_MIN doesn't change or stop the tones "
Mar 11

Graham Dyer replied to Graham Dyer's discussion APM:Plane, odd warning sound - no messages?
"Thanks Tridge, the sound is definitely coming from the Pixhawk and not the ESC but I will up the RC3_MIN a bit and see if that helps"
Mar 11

Graham Dyer replied to Ramon Rios's discussion ONE MISSION PLANNER VARIOUS POWER MODULES AND GIMBALS
"No problem, glad I could help. All the gimbal settings are there too but fall under which channel you assign for the gimbal axis. Also if you don't haven't seen it already, you can save your full parameter list, change something and then…"
Mar 11

Graham Dyer replied to Ramon Rios's discussion ONE MISSION PLANNER VARIOUS POWER MODULES AND GIMBALS
"Power module and gimbal settings are there, they just use different names (search for voltage or current for some of the power module settings). These params are saved on the fly almost as soon as they are written and so don't have a save…"
Mar 11

Andrew Tridgell replied to Graham Dyer's discussion APM:Plane, odd warning sound - no messages?
"Hi Graham, That sounds like your ESC complaining that it is receiving an out of range PWM value. When disarmed ardupilot will send RC3_MIN. Try adjusting RC3_MIN up a little and see if the beeping stops. Cheers, Tridge "
Mar 11

Graham Dyer posted a discussion

APM:Plane, odd warning sound - no messages?

Since v3.2.3 our Pixhawks are making a doh-re-me sound at rest, there are no warning messages and I can't find any info on what these tones mean? It is intermittent and irregular.Attached is the soundAny ideas?See More
Mar 11

Graham Dyer commented on Andrew Tridgell's blog post APM:Plane 3.2.3 and 3.3.0beta1 released
"What do the intermittent "do-re-me" tones indicate? It happens before a flight and sometimes in flight after launch. No messages or other indications on the MP."
Mar 5

Graham Dyer replied to Yan Ma's discussion Visual Tracking Gimbal Control
"It's a pleasure! Our use would be for anti-poaching, we could track a car or animal or poacher without having to fight with controlling our gimbal with a joystick in heavy winds. So ours is just one example of a use for good..."
Feb 25

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. I fly drones 40-120km, both at day and at night, 7 days a week on a special project. 120 hrs and 4673km as of end Nov '14.
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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