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

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Graham Dyer's Page

Latest Activity

Graham Dyer replied to Mr Flying Pizza's discussion I just want to use knob on the TX to move a servo connected to the pixhawk.
"There some info here: You can connect your servo directly to the Rx or have it controlled through the Pixhawk, either from mission planner or "pass thru" the Pixhawk. We have flaps controlled…"
2 hours ago

Graham Dyer commented on Jeff Taylor's blog post Introducing the E386 Mapping Drone
"Looking good. Few seem to use flaps these days (except most full size planes of course). We're using 60° flap for steep, slow, controlled descents with the double advantage that they provide extra lift for the flare as well as drag to slow…"

Graham Dyer replied to Tony's discussion Running 6S on 3-4S rated motor
"Technically you can use almost any reasonable voltage so long as you don't exceed the power rating. So (very simply) you could use 3S at 40A or 6S at 20A, both will theoretically produce 444W (11.1Vx40A or 22.2Vx20A). As you mentioned (with…"
Nov 18

Graham Dyer replied to Hampus Lundin's discussion Voltage drop
"Hampus, were you ever able to independently determine what your voltage was at hover?"
Nov 18

Graham Dyer commented on DavidJames's blog post +100km flight on a charge with a Techpod
"On flights like this has anyone experimented with giving the GPS more bias using ALT_MIX: ( I know it's claimed that GPS altitude is notoriously inaccurate…"
Nov 16

Graham Dyer replied to James Wright's discussion London 3d printing show recap in the group 3D Printing Drone Parts
"Thanks for this, pretty amazing how the tech is advancing."
Nov 15

Graham Dyer replied to James Dunthorne's discussion Hex-rotor rolling on takeoff - checked everything in troubleshooting guide
"Post the Dataflash log if you can.  After I set up a new copter I make sure the props are off, then throttle up to 25% and then tilt the craft forward/aft, left/right manually and listen/watch for the lower motors speeding up. So tilt forward…"
Nov 15

Graham Dyer replied to Mike Mac's discussion Bad AHRS
Nov 15

Graham Dyer commented on Tom Rearick's blog post Drones Make Love Not War
"Very interesting, same thing here in Africa. On one occasion the bees I observed seem to fly under the multirotor and unfortunately dart upwards occasionally to be struck by the blades killing them, I assumed they had stingers so moved the couple…"
Nov 9

Graham Dyer replied to m ridwan hakim's discussion Problem with my pixhack or ?
"Don't worry too much about the increasing power by itself, it does that some times as it hasn't taken off the ground it increases power to try do so. It shouldn't do it in flight."
Nov 5

Graham Dyer commented on Chris Anderson's blog post Pixhawk/APM compatible Wifi radio
"Can it run in parallel with a telemetry module? Also can one use the WiFi on a laptop?"
Nov 4

Graham Dyer replied to m ridwan hakim's discussion Problem with my pixhack or ?
"You say "Motor test C will make my motor C and D spinning together, and Motor test D same as C it will make my motor C and D spinning together, A and B is normal" That's not right, each test should make one motor turn alone by itself,…"
Nov 4

Graham Dyer replied to Gábor Zoltán's discussion Adding extra functions to MinimOSD
"Not that I'm aware of, I think the memory available on the chip is very small ."
Nov 2

Graham Dyer replied to Gábor Zoltán's discussion Adding extra functions to MinimOSD
"Feature. It's the summary of your last flight. Time, distance from home, distance covered, etc"
Nov 2

Graham Dyer commented on Starlino's blog post How much power is needed to hover ? (REVISED!)
"Where are these answers? – are larger propellers really more “efficient” ? – which multicopter configuration is more efficient:  tricopter ,  quadcopter ,  hexacopter or octacopter  ? – I heard…"
Oct 31

Graham Dyer replied to Matt's discussion I want to make a drone - I need your help
"Start here: and here: and here: Small steps first, learn to ride before you get a superbike. Remember…"
Oct 29

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 RPAS Pilot working on various projects. BVLOS mostly, day and at night. 320 hours logged and 14668km as of end Mar '15. Did 114km total distance in one flight 2014, as well as 02h17m with a 3kg electric plane.
Please tell us a bit about your UAV interest
Personal: DIY Carbon H-frame QuadCopter with 250+ flights, 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 goggles & 9" Dvd monitor.

DIY FPV folding carbon Tricopter - XUAV-X2 (AUAV.CO) powered (300mm width, 3DR Telemetry, Sunnysky X2212-980 motors, 10x4.7 carbon props, 2200/5000mAh 3S batts

Twin boom FPV 1.75m plane for long distance Nav & FPV. APM2.6, 60+ flying hours.

Old: Own design & built twin-boom UAV Plane (R.I.P.)
ArduPilot v2.7.1, ArduIMU, MediaTek GPS. Had clocked 70+ hours flying time.

Slowstick - ArduPilot Legacy v2.6.2, APM2560 + Thermopiles, was used for FPV and as a stabilized trainer.
Randburg, Johannesburg, South Africa

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Graham Dyer's Blog

RC Electric Calculator App for Android

Posted on September 3, 2015 at 12:54am 17 Comments

RC Electric Calculator App for Android - version 3.0 is coming out shortly with many improvements and some calculations…


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…


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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