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Graham Dyer
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  • RPAS Pilot Instructor - Johannesburg. (ex-Safari Trails Guide)
  • South Africa
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Graham Dyer's Discussions

So how should someone be taught to operate an RPAS?

Started this discussion. Last reply by Graham Dyer Feb 21, 2016. 2 Replies

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


Moderator
Graham Dyer commented on Hugues's blog post Flight endurance test with a Li-ion battery
"Nicely documented Hughes!"
Sunday
Tommy Larsen commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"Same here. Sent them several emails but no reply."
Feb 6
Amit commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"I think it is fake, I tried to contact them, no reply and no phone number. Strange"
Feb 6

Moderator
Graham Dyer commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"3.8V cells, 4.3V fully charged, just like DJI PH3, Mavic, etc. Wonder when these will go into the next commercial drone, DJI must be looking at them very carefully! And perhaps a bit of salivating... Is a 1 hour Phantom 5 / Pro nearly here?"
Feb 1

Moderator
Graham Dyer commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"= 11.4V, 3.4Ah. To get more capacity you'll need to parallel cells."
Feb 1
Dale Greer commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"The Hermes spec sheet says they are 10C. Each cell is 3.4 Ah at 3.8 V. So, if I make an 11.4 V battery out of three cells, will that still be 3.4 Ah, or is it 10.2 Ah?"
Feb 1
Greg Fletcher commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"Probably real good for a efficient long endurance fixed wing, but not so much for a copter. While the energy density doubles, the maximum C rating is one fifth of the best copter batteries, only 2C. You would still be pushing C limits, but my 650…"
Jan 30
Jose Luis Cortes commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"This seems similar to a Spanish company called Grafphenano. The company announced batteries of 1000Wh / kg based on Graphene. Now they are condemned for fraud. The funny thing is that these projects are very profitable, more profitable as less…"
Jan 30
Nikola Rabchevsky commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"No prices.  No way to buy a finished pack.  DIYDrones needs an editor with some posting standards."
Jan 30

Moderator
Graham Dyer commented on Wade Zhang's blog post ComNav Technology K726 GNSS RTK OEM board for express drone autopilot
"Can you mention the price?"
Jan 30
Guy Tzoler commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"don't forget these guys: http://www.enviasystems.com/"
Jan 30
Tommy Larsen commented on Graham Dyer's blog post 450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?
"Another supplier that cannot deliver ? Just like these guys: https://oxisenergy.com/"
Jan 30

Moderator
Graham Dyer posted a blog post

450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?

We've seen the claims before, 10x, 5x, 3x the energy density for some new wondrous cells.Panasonic 18650GA cells have a gravimetric density of 224 Wh/kg allowing some fixed wing drones to achieve 2+ hours of flight, these new SES cells claim 400-500 Wh/kg and are apparently available for…See More
Jan 29

Moderator
Graham Dyer replied to Rafi Nahmani's discussion Ducted fan motors vs propellers??
Jan 29

Moderator
Graham Dyer replied to Rafi Nahmani's discussion Ducted fan motors vs propellers??
"Ducted fans are less efficient, because a smaller mass of air is used for propulsion and additional friction drag and added weight from the shroud and support structure. The highest propulsion efficiency is a large, slow-spinning prop, not a small…"
Jan 28

Moderator
Graham Dyer replied to Alex Maltais's discussion Skywalker X8 wing endurance VS the c-astral wing
"I got 2h17m and 114km with a Super Skysurfer with an un-aerodynamic gimbal and a weight of 3KG. I suspect that with the same battery/motor combo an X8 would have easily gone further/longer as flying wings are quite a bit more efficient with lower…"
Jan 22

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 qualified RPAS/Drone Pilot Instructor working for a drone school. Previously did lots of BVLOS flying, mostly nighttime. 340 hours logged and 16428km as of end Mar '16.

Did 116km total distance in one flight in 2014, as well as 02h17m duration 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.
Hometown:
Randburg, Johannesburg, South Africa

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Graham Dyer's Blog

450 Wh/kg SolidEnergy batteries, the lightest rechargeable cell in the world?

Posted on January 29, 2018 at 10:27pm 10 Comments

We've seen the claims before, 10x, 5x, 3x the energy density for some new wondrous cells.

Panasonic 18650GA cells have a gravimetric density of 224 Wh/kg allowing some fixed wing drones to achieve 2+ hours of flight, these new SES cells claim 400-500 Wh/kg and are…

Continue

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…

Continue

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…

Continue

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…

Continue

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…

Continue

Comment Wall (17 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_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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