Andrew Rabbitt
  • Male
  • 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, 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 Rob_Lefebvre's blog post Sony Releases Stand-Alone Imager
"The RX100 has the ability to remote actuate via the USB port.  I didn't realise the QX100 may also have this capability.  The feature doesn't appear to be documented anywhere, but perhaps it's still available. Apparently…"
Sunday
Justin Martin commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Andrew, I think we are agreeing on most points. In regards to the poat, you, yourself, brought It to my attention that I essentially got off topic and went on to discuss matters in design that are completely unrelated, and did so in length! You…"
Saturday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Yes, it's true that Dr Prandtl wrote his paper in the 30's and some of us have seen it before.  There is a lot of received wisdom floating about and Mr Bower's presentation did a sterling job of blowing some of it away. I…"
Saturday
Justin Martin commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"I guess in a way it could be misconstrued as some kind of rant... In reality all I was getting at is that prandtl's lift distribution theory was accepted and proven over the years several times by several individuals, including Nasa. Mr Bower…"
Saturday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"You seem to be conflating a whole bunch of disparate concepts there Justin.  Give us a call back when you've got your thoughts together as clearly as Mr Bowers obviously has."
Saturday
Andrew Rabbitt commented on Chris Anderson's blog post Google producing low-cost ADSB transponders for drones
"If an ADS-B receiver is relatively cheaply available even to the hobbyist flyer, as you describe them, then this at least will alert them to traffic that they wouldn't have probably seen anyway, as well as UAS in the vicinity.  No UAS…"
Saturday
Andrew Rabbitt commented on Rob_Lefebvre's blog post Sony Releases Stand-Alone Imager
" Here's a photo from my teardown showing all the direct electrical control functions."
Saturday
entropia666 commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Brilliant! Thanks for sharing"
Friday

100KM
wayne garris commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Ha, finally some else understands that elliptical lift distribution does not work as well for a loaded aircraft. I used a bell curve lift distribution when designing the techpod, although not quite as radically as done on the Prandlt wing in this…"
Friday
Damian commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Do I understand it correctly you have negative AoA of the tips to reduce the induced tip vortex drag by reversing the lift; and it also solves the adverse yaw problem ??? Can we apply the same principle to improve the induce drag of the law aspect…"
Friday
Stephen Gloor commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Food for thought alright.  Plenty of the crashtest hobby combat wings do not have vertical fins. What I would like is someway to relatively easily calculate the twist/sweepback/airfoil combination.  I guess they are using low or positive…"
Friday

Admin
Gary Mortimer commented on Andrew Rabbitt's blog post Wing lift distribution presentation
"Watched this twice now amazing, thanks for sharing something to consider over the weekend. I know I like wings but now I like them more."
Friday
Andrew Rabbitt posted a blog post

Wing lift distribution presentation

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...?See More
Friday
Andrew Rabbitt commented on Chris Anderson's blog post Google producing low-cost ADSB transponders for drones
"A generic ADS-B number for sub-2kg (or whatever) UAV's would be enough of an incentive to use one.  At least it'd make the manned pilot population more comfortable with having them share "their" airspace..."
Friday
Jared Reabow commented on Andrew Rabbitt's blog post Digital flight control research from the '80s
"can you imagine flying an x8 past  them no flight controller hehe"
Mar 3
Stephen Gloor commented on Andrew Rabbitt's blog post Digital flight control research from the '80s
"You might need two and use the speed difference between them to estimate it.  Mind you I could just take the Penquin out this week and move the battery back a bit and see how it goes.  I also have a wing that is eventually getting an APM…"
Mar 3

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

Wing lift distribution presentation

Posted on March 27, 2015 at 12:50am 9 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 (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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