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

Graham Dyer's Friends

  • Alban Monares
  • Paul Morgan
  • Gerhard Laubscher
  • ChavAnd
  • Yan Ma
  • Steve Stark
  • pma_
  • Mike
  • Edson Moura
  • David Pulvermacher
  • Spyros
  • Quadzimodo
  • Tyrell John
  • Riaan Vermeulen
  • Gabriel DeVault

Graham Dyer's Groups

Graham Dyer's Discussions

APM:Plane, odd warning sound - no messages?

Started this discussion. Last reply by Grant Morphett Aug 9, 2015. 18 Replies

APM 2.5 suddenly lost ability to connect via USB or Telem

Started this discussion. Last reply by Pavel Sorejs Feb 9, 2015. 1 Reply


Graham Dyer's Page

Latest Activity

Graham Dyer replied to Tyler Troutt's discussion Pixhawk Board Rotation and Compass_Orient
"The internal compass is not really necessary and because it is usually closest to DC power cables it often has higher offsets or gets affected when in flight. The external compass however is necessary and the copter will fly fine with it as long as…"

Graham Dyer replied to Vai's discussion Copter doesn't lift and draws less current than the maximum current it should actually draw.
"You'll need 11x4.7 props for get the current draw and lift you require. You're using about 220W without payload but need more with it. To get more power either increase current (- larger props) or voltage (- 4 cell battery) or both. Some…"

Graham Dyer commented on Nick Arsov's blog post AUAV-X1 , a new vision of the PX4 autopilot
"Old thread but still want to use my X1. How does one connect an analog airspeed sensor to the X1? There are pins for it on the X2 but what does one do for the X1?"

Graham Dyer replied to Gregor's discussion Phantom 4 or DIY drone?
"I doubt Phantoms will be phased out, the Phantom 4 Pro and Pro + have just been launched and the response is very favorable. They will sell like crazy just like the Mavic. If the OP is a tinkerer then go DIY, if not go Mavic or PH4. Used 3's…"
Nov 16

Graham Dyer replied to testuser0001's discussion Bix3 crash in auto mode (log included)
"I have to ask, have you done test flights in FBW-A and Loiter? At what angle does the plane climb in FBW-A with at 80% throttle and holding full up pitch? Are all your control surfaces moving the right amount? What amount of elevator up/down is…"
Nov 7

Graham Dyer commented on Bill Isenberger's blog post Hobbyking web site update makes it harder to find what you are looking for.
"I went off Hobbyking when they deliberately deleted many negative comments on their counterfeit Pixracer product page before eventually taking it off their website.…"
Oct 28
Andreas commented on Graham Dyer's blog post ArduPilot formation flying attempt
"Wow, im starting to surf on this topic of swarming and its awesome. For instance i see that it would be very very useful in geographic survey, if you can swarm to aircraft yo can adquire the terrain data far more quickly that with one aircrat. Of…"
Oct 6

Graham Dyer replied to Pau's discussion Using storm Pro-3 universal gimbal throught pixhawk
"As Marc said it's not a Storm32, they state it uses SimpleBGC V2.40b7 firmware and do not to update it (why not?)"
Sep 29
Petrus Botha replied to Graham Dyer's discussion Pilot's wanted in the group South African DIY Drones User Group
"Graham, I know this is an old post, but are you guys still looking for RPL Pilots?"
Sep 26

Graham Dyer commented on Chris Anderson's blog post Great article on the use of drones to combat poaching
"Burning the ivory achieves a couple things: publicity, which is invaluable and it removes the cause of bribery, corruption and theft which are enormous problems in Africa. Already stockpiles of rhino horn have been stolen from a wildlife authority…"
Aug 10

Graham Dyer replied to Grixis's discussion I need help setting up a FPV camera on a Pixhawk
"I've only managed this with Mission Planner not QGC. One thing there was to set the end points for the channels used for camera control. Do you need additional control through the Pixhawk? Otherwise for normal FPV just connect direct to Rx?"
Jul 14

Graham Dyer commented on Nicholas Witham's blog post Pixracer (actually a counterfeit): Now available from Hobbyking!
"Didn't take long, about a day and it has been replaced by **** That's very cheeky, how about a twitter campaign - #HobbykingCounterfeits ?"
Jul 5

Graham Dyer commented on Nicholas Witham's blog post Pixracer (actually a counterfeit): Now available from Hobbyking!
"Put another comment in the questions section... will be interesting to see how long it lasts."
Jul 4

Graham Dyer commented on Hugues's blog post Anti Jello mount for Mobius brushless gimbal
"It seems to be a good simple way of getting rid of the dreaded jello. RCExplorer uses the weight of the battery on wire supports to get rid of it: After a long time and much experimentation I've…"
Jun 25

Graham Dyer replied to Tom Moore's discussion V-tail sizing example - but is it correct?
"I always err on the larger size with empennage, as the benefits of bigger outweigh the detriments IMO."
Jun 24

Graham Dyer replied to Hakjun Lee's discussion PIXHAWK + S900 Problem, please advise in the group PIXHAWK
"I do this with all my maiden flights as a sure way to see if there are any problems: On shortish grass/lawn, in an open area, carefully throttle up so the multirotor is just starting to "get light on the skids". Do not let it take off! Now…"
Jun 23

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

Graham Dyer's Photos

  • Add Photos
  • View All

Graham Dyer's Blog

RC Electric Calculator App for Android

Posted on September 3, 2015 at 12:54am 16 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 14 Comments

Further to our first attempts at fully automated formation flying (see…


Another 100km+ flight

Posted on February 11, 2014 at 4:00am 25 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…


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, Vikram said…
have u got success in reversing ur aileron ... i m using same setup with XY sensors
At 2:12am on August 21, 2009, Vikram 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, Vikram said…
so u must have tried #define ROLL_REVERSE 1 , then nothing happened ... am i right..
At 3:08am on August 21, 2009, Vikram 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 Vertical Horizontal one, is here

© 2016   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service