Andrew Rabbitt
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  • Melbourne, Victoria
  • Australia
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Andrew Rabbitt's Groups

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Andrew Rabbitt's Discussions

Logging airspeed on 2.74 onwards...?

Started this discussion. Last reply by Andrew Rabbitt Feb 6. 2 Replies

Does anyone know which parameter group I can find airspeed to log (passively). I have looked in CTUN and NTUN but neither appear to have this listed. Any hints and tips here...?

APM in a 250

Started this discussion. Last reply by Rob_Lefebvre Jan 20. 8 Replies

The crazy man in me is trying to stuff an APM into a cheapie HK250GT as a method to waste an inordinate amount of time. (and likely also money) It is a great lesson in weight reduction and…Continue

Arduino/Ardupilot IDE "hangs" whilst attempting to complie

Started this discussion. Last reply by Andrew Rabbitt Aug 9, 2013. 1 Reply

I'm trying to compile a (very) subtly modified version of Arduplane 2.74b using the IDE downloaded from the Arduplane website (1.0.3) but it hangs when I try to compile.  Actually, it doesn't hang…Continue

Mapping servo neutral and end points...?

Started this discussion. Last reply by Andrew Rabbitt Aug 28, 2013. 5 Replies

Does anyone know any way of mapping the servo mid and end points that APM uses?I have modified elevons on my Skyfun which, unfortunately, have a limited down travel.  If the elevon servo forces it…Continue

 

Andrew Rabbitt's Page

Latest Activity

Andrew Rabbitt replied to Michael Levesque's discussion Possible Composite X8 in the group X8
"I've been working on a wing design that's quasi-Skyfun size (1000mm span) but I keep running into MTOW/payload issues with the equipment I want to have on board.  I'm beginning to think I need to scale it up to achieve my goals.…"
Thursday
Andrew Rabbitt commented on Brian Greeson's blog post My illegal UAS flight
"Well, if you asked the prosecution for evidence of jurisdiction, they might just withdraw the case..."
Oct 13
Andrew Rabbitt replied to Andrew Rabbitt's discussion Skyfun UAV build
"How to polish a turd 101: Well, never one to leave things well alone, I am somewhere along the homeward stretch on my next Skyfun airframe.   I have abandoned pretensions of making it break down for packing and glued it all together, laminated…"
Oct 11
Andrew Rabbitt commented on Stephen Dade's blog post CanberraUAV UAV Outback Challenge Review
"Interesting post Stephen.  It almost sounds like you need to implement a mission command structure like NASA with a series of defined roles and a checklist tailored to each role, including a Supreme Being/Pilot-in-Command/Flight…"
Oct 9
Andrew Rabbitt commented on Jonathan Meringer's blog post Hobbyist Friendly, Autonomous Drone...
"Oh, also given that you're carrying a camera, you could ditch the IMU stuff entirely and run with a "visual-IMU" system based on the University-of-Zurich ideas published here recently"
Oct 8
Andrew Rabbitt commented on Jonathan Meringer's blog post Hobbyist Friendly, Autonomous Drone...
"Interesting concept. I'd ditch the swashplate control and attempt a weight-shift mechanism myself. "
Oct 8
Andrew Rabbitt commented on Andrew Tridgell's blog post CanberraUAV Outback Challenge 2014 Debrief
"Another blog post of Tj's work here"
Oct 8
Andrew Rabbitt commented on Andrew Tridgell's blog post CanberraUAV Outback Challenge 2014 Debrief
"I have configured the ESC for my soon-to-fly Skyfun using SimonK firmware.  This puts zero at mid-PWM (1500?). I was planning on putting an addition to one of the FBW modes that added reverse thrust quasi-sinusoidally based on pitch attitude…"
Oct 8
Andrew Rabbitt replied to Steven G's discussion Failsafe, then crash
"That's being a bit harsh, Andre.  We'll all make mistakes in these endeavours and pay for them, hopefully only with broken parts."
Oct 5
Andrew Rabbitt replied to Steven G's discussion Failsafe, then crash
"It's important too, to make sure you know what the FS stick inputs are doing to the APM/PH.  The radio might know its in FS mode, but if APM doesn't it may behave like it's in the correct mode but with a stick input mixed in."
Oct 5
Andrew Rabbitt replied to Steven G's discussion Failsafe, then crash
"Are you saying your radio does something different in failsafe/LOS mode when it's flying than when it's on the ground?  Likewise, on APM?"
Oct 5
Andrew Rabbitt replied to Steven G's discussion Failsafe, then crash
"It's worth pointing out that if you expect some feature to work, you should at least test that it works in a safe environment before relying on it.  This lesson would be from flight testing 101, I'm guessing..."
Oct 5
Andrew Rabbitt commented on Thomas J Coyle III's blog post Guilty verdict in third Yellowstone Park unmanned aircraft case
"If should be noted that, if they did plead guilty in all cases as the article seems to read, then it demonstrates the power of the State in a playground bully kind of way, rather than any robustness of the law in a legal sense..."
Oct 5
Andrew Rabbitt commented on Andrew Tridgell's blog post CanberraUAV Outback Challenge 2014 Debrief
"Awesome results, Andrew and team. Great to hear all the details too. What's the future for the UAV challenge now Joe's been done and dusted so comprehensively?"
Oct 4
Andrew Rabbitt commented on Rob_Lefebvre's blog post Arducopter Flies Gas Powered Helicopter
"Really nice work, Rob!  I'm impressed!  Well done!"
Sep 22
Andrew Rabbitt commented on wayne garris's blog post Techwing update and maiden
"Nice one Wayne!  I'm real keen to learn how effective your slotted LE's are in the real world.  After playing about with airfoils, vortilons and wing fences in OpenFOAM, I'm about to try some slots.  I plan to post up…"
Sep 22

Profile Information

About Me:
Mechanical Engineer with more than a decade in electronic engine control development and application in the OEM sphere. I am a lapsed PPL(A) and currently an experimental aircraft builder (Van's RV-8). UAV's are a fascinating diversion from rivetting...
Please tell us a bit about your UAV interest
Inspired by press articles earlier this year on near-space ballooning, I would like to one day send a UAV glider aloft for a positionable return to land. I'm sure others have similar ideas.
Hometown:
Melbourne, Australia (sometimes)

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Andrew Rabbitt's Blog

Telemetry Radio Range testing with home-made dipole antenna

Posted on April 28, 2014 at 11:10pm 14 Comments

On Sunday I spent the morning self-consciously traipsing around my brother's neighborhood with an apparently wierd collection of hand-held electronics and foam in the form or my APM, battery and a Hextronic 3DR knock-off 915MHz telemetry radio and Skyfun fin. We left a laptop on the top floor of the house running APM Planner with the base station radio connected directly to the USB port and using a standard "duck" monopole…

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1300kJ/kg Battery - from the Too-Good-to-be-True Newsdesk

Posted on April 28, 2014 at 5:01pm 15 Comments

This smartphone-sized pocket battery is being marketed for emergency starting of cars with flattery-battery-syndrome, but if the manufacturers specs are believable it would make a fantastic power pack for quads etc.  More than…

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Mercedes Benz vision systems research

Posted on October 4, 2012 at 9:30am 4 Comments

I saw a feature about Mercedes-Benz collision avoidance vision systems research on the Telly here in Germany where I am at the moment. 

 

This particular project uses two cameras to create stereo vision.  Comparing the two images is used to detect pixels that represent motion that could be hazardous to the vehicles current path.

Unfortunately,…

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Mould Plug CNC Machining for HDwing4

Posted on May 24, 2012 at 10:03pm 5 Comments

Since the topic of CNC mills has raised its head here, I thought I'd share this with the DIYDrones community.

One of the things those who are considering this need to be aware of is that the toolpathing of complex shapes isn't a trivial exercise.  I would be interested to know if anyone has experience with any open-source surfacing toolpathing packages - please comment below! 

I am fortunate to have access to MasterCAM V9 - old-fashioned as it is - but…

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Comment Wall (3 comments)

At 6:15am on February 11, 2012, Paul Marsh said…

Oops.  Wrong URL in my PM to you.  Try this:

http://www.poweredmodelairplanes.com/outline.wrl

Paul

At 6:32am on June 17, 2013, Acorn said…

Andrew - Thank you for commenting on my BLOG DIY Passive Gimbal.

How about whacking four free-spinning electric motors on it? One flanking each axis? Just so it is balanced. Would they cancel eachother out? Or would making them spin CW / CCW to each other be better?

At 5:57pm on November 20, 2013, Justin Martin said…

Hello Andrew! Thanks for the support, and offer. I will definitely keep you in mind if anything comes up. The Idea behind the albatross is open. By this I mean, it has specific goals and design elements, however in the long run I would truly like innovations to be customer based. For instance, If customers started laser cutting their own internal storage shelves/formers, and/or other mods, such as a dome/nose adapter.

If the Pro version every comes to be, I will definitely be needing some specific arts, such as retaining clamps and rings for easy quick-release style components.

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