Andrew Rabbitt
  • Male
  • Melbourne, Victoria
  • Australia
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Andrew Rabbitt's Friends

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  • Mario Carpeggiani
  • Acorn
  • Horace Cunningham
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Andrew Rabbitt's Groups

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    X8

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Andrew Rabbitt's Discussions

Logging airspeed on 2.74 onwards...?

Started this discussion. Last reply by Andrew Rabbitt Feb 6, 2014. 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, 2014. 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 commented on Ioan Ghip's blog post Man sized *copter
"He needs to carry some fireworks for the full effect!"
yesterday
Andrew Rabbitt commented on Richard Burd's blog post Improving the RV-Jet Airframe
"OK, back to the flight testing proposal: My aim (and I will try this one day) is to be able to calculate the L/D curve for an airframe by logging and post-processing data collected on APM.  This is not new and I first read about the idea in a…"
May 17
Andrew Rabbitt commented on Richard Burd's blog post Improving the RV-Jet Airframe
"@Ultrafuge, I've not seen FLZ-Vortex but it looks a lot like XFLR5 which I've used quite a bit.  I've also started experimenting with OpenFOAM for the full CFD effect on my latest design work.One of the big issues with…"
May 17
Andrew Rabbitt commented on Richard Burd's blog post Improving the RV-Jet Airframe
"Argh!  Just accidentally deleted a post describing the glide testing process.  No time to rewrite it now - will do later."
May 13
Andrew Rabbitt commented on Richard Burd's blog post Improving the RV-Jet Airframe
"I didn't mean to come across as critical of your methods, Richard.  I applaud your achieving real-world results, however whilst I understand and agree with your claim that you have made the UAS more efficient - you have the data to…"
May 13
Andrew Rabbitt commented on Richard Burd's blog post Improving the RV-Jet Airframe
"I think your analysis is a bit flawed, Richard, but you might have accidentally stumbled on the right answer. You have markedly increased the wing area, which improves wing loading but also, normally, drag because drag is a function of wing area,…"
May 12
Andrew Rabbitt left a comment for Paul Meier
"Hi Paul, I think you should be able to solder to the flex PCB.  It's pretty small SMD stuff, but if you're handy with a small-tipped soldering iron, it should be possible."
Apr 23
Paul Meier left a comment for Andrew Rabbitt
"Hi Andrew I have seen your pic of the qx 100 teardown. I want to teardown my qx 10 but before I do may I ask do you think it is possible to soldier a connection on where the shutter button is (on the flexible printed circuit) and then use pixhawk to…"
Apr 23
Andrew Rabbitt commented on Dan Wilson's blog post Autonomous Airborne Docking for Refueling or Recharging
"Very impressive indeed!  Congratulations!"
Apr 18
Andrew Rabbitt commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Yes, interesting point Andy. Although your ellipsoidal lift distribution can suffer the same fate if it's generated through washout and not chord/planform."
Apr 18
Andy Little commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Interesting, though I dont see this as that new? It has been covered in detail in various books on aerodynamics  from 70's 80's AFAIK I built a wing using a bell shaped lift distribution and found it performs well. Tensor V2 article…"
Apr 18
Andrew Rabbitt commented on Andrew Rabbitt's photo
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Delta Wing - render 15

"BTW, this is the baby I'm working on now.  A slow road but I hope to publish more details soon. "
Apr 17
Andrew Rabbitt commented on Andrew Rabbitt's photo
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Delta Wing - render 15

"No problem and thanks for the compliments!  Welcome to DIYD!"
Apr 17
braindead962 commented on Andrew Rabbitt's photo
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Delta Wing - render 15

"Sorry, forget that as a question - I just followed a link . . .still new to the site. Anyway, wonderful work - I'd love to see this made and flown."
Apr 17
braindead962 commented on Andrew Rabbitt's photo
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Delta Wing - render 15

"Alright for those of us coming late to the party, if you're doing re-colour and rework, who gets credit for the original - beautiful work."
Apr 17
Andrew Rabbitt commented on Chris Anderson's blog post Full Solo launch video
"Here's the director's cut of the launch video... "
Apr 14

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)

Andrew Rabbitt's Photos

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Andrew Rabbitt's Blog

Wing lift distribution presentation

Posted on March 27, 2015 at 12:50am 11 Comments

A very interesting and thought provoking explanation of why the conventional wisdom of elliptical lift distribution needs rethinking.  Interesting for lovers of fixed-wing but also might be applicable for propellers and rotors...?

Digital flight control research from the '80s

Posted on March 2, 2015 at 4:25am 11 Comments

I tripped over this on my suggested links and thought it might be of interest to the DIYD crowd.  Fascinating to see an original Macintosh being used as a ground station!

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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Comment Wall (4 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.

At 8:01am on April 23, 2015, Paul Meier said…

Hi Andrew

I have seen your pic of the qx 100 teardown. I want to teardown my qx 10 but before I do may I ask do you think it is possible to soldier a connection on where the shutter button is (on the flexible printed circuit) and then use pixhawk to trigger ?

Many thanks in advance,

Paul

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