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


Moderator
Graham Dyer replied to Charosenz's discussion Batt FS triggering too soon, any ideas appreciated
"Ok, I see it now. Yes, perhaps it is sensing current higher than actual and therefore the mAh counts down really quickly?"
4 hours ago

Moderator
Graham Dyer replied to Charosenz's discussion Batt FS triggering too soon, any ideas appreciated
"6: Battery failsafe ECode 1: battery voltage dropped below LOW_VOLT or total battery capacity used exceeded BATT_CAPACITY"
7 hours ago

Moderator
Graham Dyer replied to Charosenz's discussion Batt FS triggering too soon, any ideas appreciated
"Can you show a screen print of this "reserve" amp value you speak of as I fear I'm misunderstanding you. If it's what I think it is then it's not the amount left in your battery, it is the total capacity of your battery so…"
7 hours ago

Moderator
Graham Dyer replied to Randy's discussion ArduCopter-3.1 released!
"No, this is with v3.1.3, using the same parameters as the APM2.5. My vibrations are low, all I changed was the APM and now I can't get Alt_Hold to alt hold so it must be a hardware difference."
7 hours ago

Moderator
Graham Dyer replied to Randy's discussion ArduCopter-3.1 released!
"As an experiment I replaced an APM2.5 with an old APM1.4 on my tricopter and I'm happy to say it works really well using the exact same parameters (apart from the few small APM1 specific differences). Loiter holds position very well but…"
9 hours ago

Moderator
Graham Dyer replied to JB3's discussion Seeking prop balancing tips
"These balancers are often not perfectly in balance themselves and the shaft tips not perfectly centered. I used the conical purple pieces but put onto my own turned-up shaft with very sharp ends. Now a 1cm piece of sellotape will change the…"
9 hours ago
Jethro Hazelhurst commented on Graham Dyer's blog post Prop testing on a 'copter
"I have some 12" RCT Carbon Fiber Propellers on the balancer right now, I can't wait to test them out. Thank you Graham!"
11 hours ago
Andrew Rabbitt commented on Graham Dyer's blog post Prop testing on a 'copter
"Nice to see someone doing some real quantitative testing which seems to be a rare thing despite all the effort many put into experimentation. One comment though regarding the method is that there's nothing to identify repeatability. I assume…"
20 hours ago
Euan Ramsay commented on Graham Dyer's blog post Prop testing on a 'copter
"I've got the 1045 and 1147's in Y6 mode, and they seem ok. I tried 1045 top and bottom, but didn't really notice any difference. My rig is twice the 1kg of the OP's though... They do break easy though - right at the hub. I…"
yesterday

Moderator
Graham Dyer replied to Pasquale Abbattista's discussion Some doubts with PIDs
"One effect of I is that it corrects balance problems and keeps the 'copter more level, it also dampens the bounce caused by a high P. P is the strength of the correction but it does little to keep the copter level, it only reacts to an input…"
yesterday

Moderator
Graham Dyer replied to Pasquale Abbattista's discussion Some doubts with PIDs
"While I wouldn't suggest these settings exactly for your hex, they work for me. I use quite different PID's for my Tricopter which turns the 'copter into a really smooth but tight and responsive 'copter. I've used similar…"
yesterday

T3
Ted Van Slyck commented on Graham Dyer's blog post Prop testing on a 'copter
"I'm surprised no one has posted the math yet, so I'll do it 10x4.7 = 7.44 g / watt 11x4.7 = 7.21 grams / watt 12x3.8 = 7.09 grams / watt Honestly, I'd say for 5500' those are pretty good numbers. At sea level I bet they would be…"
Friday
Artem commented on Graham Dyer's blog post Prop testing on a 'copter
"oh yes, I love the 11.47 rctimers!  they are perfect for the money! my dt750 @4s and 11x47 rctimers drwas about 9-10amps (tri total) on hover (i know dt750 are officially rated for 3s but they do just fine for on 4s not even warm after 13-15…"
Friday

Moderator
Graham Dyer commented on Graham Dyer's blog post Prop testing on a 'copter
"@thomas, well the 12x3.8's only draw 200mA(!) more than the 11x4.7's so potentially frying the motor with a bigger prop like this is a common misconception. Each motor is only drawing 4.11A so they aren't even close to breaking a…"
Friday

Wiki Ninja
Gary McCray commented on Graham Dyer's blog post Prop testing on a 'copter
"Hi Graham, Very interesting and the opposite of what I would have expected and what has been my own (admittedly limited) experience on small quads. I also plugged you copter into Xcopter calc and the main numbers fell in the same ball park, except…"
Friday
thomas Butler commented on Graham Dyer's blog post Prop testing on a 'copter
"Perhaps compare them to the new APC multi-rotor 12x4.5 (MRP) props?!  The MR props are stiffer and have a beefier hub. There was lots of hype over the MR props, but they've been a disappointment on my machine.  Is…"
Friday

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.
Hometown:
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 9 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…

Continue

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…

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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…

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Finwing Air Titan

Posted on February 6, 2014 at 11:30am 13 Comments

Looks like a good fpv/camera ship for long distance flights with…

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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…

Continue

Comment Wall (14 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_1(90+roll);
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.
so
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

GARTH
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.

Gerrit
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

0733000337
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,
Regards
bruno

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 (www.motmen.com)

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