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, 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

Cronselaar commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"One of the best aero posts in a while, also like the fact that you stay true to your own understanding and ideas..."
18 hours ago
Vladimir "Lazy" Khudyakov commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew Simple build and fly it. And back after to discuss about deflection, fences, L\D and so on... Build it. "
yesterday
Martin commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew, do the spoilerons only move up?"
yesterday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Vladimir, of course it's possible as are many other things, but it may or may not be desirable.  Your zero control deflection AoA is far away from your best L/D angle that you dramatically modify your aerofoil profile with elevon…"
yesterday
bgeig commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"Andrew - Could you share some details on creating the mesh and modifying it in OpenFoam? I have always found that is the hardest problem to overcome when using it. Are you using a commercial grid program or just the OpenFoam tools? Thanks."
Thursday
Martin commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew, I guess twist is right way to go then. Btw, it's also possible to use cambered airfoils in the pitch neutral areas of the wing. Blending the airfoils will be very hard though."
Thursday
Vladimir "Lazy" Khudyakov commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew It does not matter... :))) My promise: flying wing must be build clean and simple as possible. Any construction or waste aerodinamics perversion. As you see, possible to buil using NACA foils without elevon deflection. "
Thursday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"Very nice Vladimir.  What can it do?  L/D? Range, Payload etc. etc... @Stephen,  yes I'm familiar with Martin Hepperle's page and it is a good resource.  The part you refer to is limited to linear twist distribution…"
Thursday
Martin commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew, I think flaps are the easiest way to achieve higher CLmax on a flying wing. I am also working on a 500 mm span flying wing. Looks similar to Vladimir's picture. The longest flight has been a few minutes shy of an hour. The payload is…"
Thursday
Stephen Gloor commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"Andrew - Have you seen Martin Hepperle's flying wing design algorithm? http://www.mh-aerotools.de/airfoils/ - click on the "Basic Design of Flying Wings" You can get the twist required with different cambered airfoils. "
Thursday
Vladimir "Lazy" Khudyakov commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
" For the microplane lovers :))) 500 mm span.  "
Thursday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"No bother, Vladimir.  I know as you do, there are a zillion different ways to design a flying wing. I was constraining myself to sub 1m span and high wing loading because I wanted portability, good payload and the ability to operate in a small…"
Thursday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Martin, deflect flaps downwards, deflect elevons upwards - hey presto, huge washout! :D"
Thursday
Vladimir "Lazy" Khudyakov commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew Sorry, I misled you :))) Find my VERY OLD drafts notes and fast restored project on XFLR. NACA23012 -> NACA0010 linear transition. Details you will se on pictures. "
Thursday
Martin commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Andrew, you could try using flaps. Allthough they can't be as large as on a tailed plane. And yes, they can be moment neutral. http://www.rcgroups.com/forums/showthread.php?t=1320227&page=2&highlight=library#post16265473"
Thursday
Andrew Rabbitt commented on Andrew Rabbitt's blog post Exploring the secrets of flying wing design with CFD.
"@Martin,  my design has been focused on maximizing CLmax.  If you need elevon deflection at high CL you run into the reverse spanwise flow problems I describe in my blog post.  This is the reason that a) I don't want full span…"
Thursday

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

Exploring the secrets of flying wing design with CFD.

Posted on July 28, 2015 at 9:36pm 39 Comments

The flying wing design I have been working on for some time now has been slowly evolving as I have learned more about aerodynamics and expanded my skill set with modelling tools of various forms.  I have recently completely re-surfaced my design with new aerofoil sections and better, more consistent surface…

Continue

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…

Continue

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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