Graham Dyer's Blog (27)

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 sale now.

Could we see a 1 hour multirotor flight as normal…

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Added by Graham Dyer on January 29, 2018 at 10:27pm — 11 Comments

RC Electric Calculator App for Android

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

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Added by Graham Dyer on September 3, 2015 at 12:54am — 16 Comments

Prop testing on a 'copter

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 Tricopter, battery used is a new Turnigy 3300mAh 30C 3 cell. The motors are…

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Added by Graham Dyer on April 18, 2014 at 9:43am — 18 Comments

ArduPilot formation flying revisited

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

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Added by Graham Dyer on April 14, 2014 at 11:29pm — 14 Comments

Another 100km+ flight

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 landing. 

Basically we did a 300m diameter Loiter for most of the flight,…

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Added by Graham Dyer on February 11, 2014 at 4:00am — 25 Comments

Finwing Air Titan

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

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Added by Graham Dyer on February 6, 2014 at 11:30am — 16 Comments

ArduPilot formation flying attempt

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…

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Added by Graham Dyer on January 7, 2014 at 1:00am — 13 Comments

Testing a cheap(ish) brushless gimbal...

Been testing a brushless gimbal on my quad, it's an own-design laser-cut Liteply gimbal which uses a Foxtech AIO (Martinez) controller ($50) and Foxtech 2208-70kv motors ($21). Information is a little hard to…

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Added by Graham Dyer on August 14, 2013 at 11:18am — 19 Comments

Safety is no accident!

Are model planes dangerous? Are multicopters dangerous?

Below is a link to a thread showing what happens to people who thought they weren't.…

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Added by Graham Dyer on July 19, 2013 at 11:30pm — 16 Comments

Quadcopter in the Kalahari, Part 2

Eventually I got around to part 2, part one is…

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Added by Graham Dyer on July 6, 2013 at 8:59am — 1 Comment

Folding EPP Foam H-Frame Quad

Following on my Carbon H-Quad, I have now…

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Added by Graham Dyer on April 14, 2013 at 1:00pm — 28 Comments

It WORKS...!! Fully automated parachute drop from quadcopter.

Thanks to the Dev team for getting ACv2.9 to us, especially as it fixes a lot of features that have been broken for a while.…

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Added by Graham Dyer on January 20, 2013 at 4:00am — 12 Comments

Pitlab.com OSD & Autopilot launched

The OSD (On Screen Display) is an instrument that…

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Added by Graham Dyer on January 17, 2013 at 8:30am — 7 Comments

DIY Carbon H-Frame Quadcopter

(More construction photos in link below)

I was…

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Added by Graham Dyer on September 29, 2012 at 8:00am — 23 Comments

Skylark Dianmu OSD with RTH

This looks rather nice, the Dianmu system only has RTL (return to launch) whereas the Standard system has that plus waypoint ability. (…

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Added by Graham Dyer on August 20, 2012 at 9:52am — No Comments

GoPro fun in the park, quadcopter with ACv2.5

Had a little fun flying in a local park here in Johannesburg, South Africa. Used a GoPro Hero on my own design anti-vibration mount and my quad running the newly released v2.5 firmware. Click on the photo to go to the youtube video.

Quad specs:

APM2

KDA20-22L motors from Hobbyking, 11x4.7 APC SF props

2 x Super Simple 25-30A ESC's from Hobbyking, two more…

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Added by Graham Dyer on March 20, 2012 at 5:06am — 6 Comments

Volts, Current & Watts with 9x5 3-blade and 11x4.7 2-blade props.

Superimposed volt/current graphs - 9x5 3-blade in red and 11x4.7 2-blade in blue

 

Further to my informal testing of 3S and 4S batteries with the same prop I did a test with 9x5 3-blade props (http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=5248) and 11x4.7 2-blade props (APC SF 11x4.7).

Test procedure:…

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Added by Graham Dyer on March 7, 2012 at 12:29pm — 6 Comments

Amps, volts & watts comparison on quad with 4S & 3S batteries

I have an old BNB Digital Power recorder so I wanted to have a look at the hovering power requirements of my quad. The weight of the quad with either battery is very similar.

Quad specs:

APM2

KDA20-22L motors from Hobbyking

2 x Super Simple 25-30A ESC's from Hobbyking

2 x Hexfet 25A ESC's from Hobbyking (2 of 4…

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Added by Graham Dyer on March 1, 2012 at 9:32am — 10 Comments

ArduCopter in the Kalahari

(Click the picture for the Youtube video)

Some onboard video taken from my quadcopter in the Kalahari desert, South Africa, bordering the Kgalagadi Transfrontier Park. Sorry not GoPro quality and there's no sound.



Separate Mediatek GPS's on both ArduPilot Mega and the Remzibi OSD. A Hobbyking 420 TVL camera provides the video sent back to the ground via a BOB Fox 700 1.2GHz transmitter.…

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Added by Graham Dyer on February 17, 2012 at 1:00pm — 3 Comments

ArduPilot Legacy - RTL & Loiter FPV Video

 

A couple flights this morning using my trusty old ArduPilot Legacy & ArduIMU. Separate Mediatek GPS's on both AP and the Remzibi OSD. A Hobbyking 420 TVL camera provides the video sent back to the ground via a BOB Fox 700 1.2GHz transmitter. FPV is done with video goggles. Radio is a Hitec Aurora 9.

 …

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Added by Graham Dyer on October 9, 2011 at 1:30pm — 4 Comments

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