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. 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 commented on John Githens's blog post Multirotor used near Vancouver International Airport and Vancouver Harbour
"Well, this lends new meaning to the VFR term "see and avoid"! "
4 hours ago
Andrew Rabbitt commented on Eli Cohen's blog post FDM Ag UAV
"I see what you're saying Eli, but you're comparing the DIY AM, no labor costs approach with paying skilled people to make a composite airframe.  If you're looking at comparing apples with apples, then you have to factor in the…"
4 hours ago
Andrew Rabbitt commented on Eli Cohen's blog post FDM Ag UAV
"I'm still pretty conflicted as to the merit of additive manufacturing.  I see it's advantages at small scales and for complex geometry, but if this airframe would cost USD8000 in the real world, I could machine a set of Al moulds for…"
5 hours ago
Andrew Rabbitt commented on Eli Cohen's blog post FDM Ag UAV
"All very fair and valid points Eli.  Good luck with the continued testing and do keep us posted!"
23 hours ago
Andrew Rabbitt commented on Eli Cohen's blog post FDM Ag UAV
"You don't necessarily need to do flight testing in a wind tunnel.  Here's a paper that should give you some ideas as to how you could use APM to log data and regress to find the airframe drag polar."
23 hours ago
Andrew Rabbitt commented on Eli Cohen's blog post FDM Ag UAV
"Do you have any performance data for the airframe?  Did you try to do any flight testing to correlate with design predictions?"
yesterday
Andrew Rabbitt commented on Graham Dyer's blog post Prop testing on a 'copter
Monday
Andrew Rabbitt commented on Graham Dyer's blog post Prop testing on a 'copter
"Nice to see someone doing some real quantitative testing which seems to be a rare thing despite all the effort many put into experimentation. One comment though regarding the method is that there's nothing to identify repeatability. I assume…"
Sunday
Andrew Rabbitt commented on Emlid's blog post NAVIO: RTK demonstration
"awesome!"
Apr 16
Andrew Rabbitt commented on Chris Anderson's blog post Google buys Titan Aerospace (solar powered, high-altitude drones)
"Is Google going to buy out the FAA, Jack?"
Apr 14
Andrew Rabbitt commented on Chris Anderson's blog post Insanely big multicopter (?) lifts off
"No, the other two aren't worth boasting about, Euan."
Apr 14
Andrew Rabbitt commented on Chris Anderson's blog post Insanely big multicopter (?) lifts off
"Oh, and two-strokes or not, they will be burning a lot less fuel than your average turbine helicopter.  They'll be running in the region of 300g/kWh, whereas a turbine could easily be twice that, or more."
Apr 13
Andrew Rabbitt commented on Chris Anderson's blog post Insanely big multicopter (?) lifts off
"On closer inspection, they run the engines with gear reductions for one direction and belt reductions for the counter-rotating prop.   Odd really, because the 2-stroke engines can easily be made to run backwards, although whether the gear…"
Apr 13
Andrew Rabbitt commented on Chris Anderson's blog post Insanely big multicopter (?) lifts off
"They look like Hirth H30's.  About 100hp each."
Apr 13
Andrew Rabbitt replied to Lockhart's discussion X8 Thust Angle? in the group X8
"hang the aircraft from a string on the prop shaft and see whether the prop axis and the string line up."
Apr 12
Andrew Rabbitt replied to Andrew Rabbitt's discussion Skyfun UAV build
"OK, so Skyfun Mk2 is in gestation and I've got a bunch of new stuff planned, including telemetry and REVERSE THRUST! Here is my new Turnigy ESC with reversible (SimonK) firmware loaded up and functioning.  I am a happy boy right now,…"
Apr 6

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

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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Introducing HDwing 4 - my motor-glider for high altitude balloon (HAB) launch

Posted on March 15, 2012 at 5:00pm 18 Comments

Some who have followed my blog posts will know that I have been working on my HDwing design series for a return-to-launch glider concept using ArduPilot Mega.  Everything I have revealed so far has been based on relatively conventional flying wing ideas. Till now...

This forward-swept flying wing concept was inspired by the work of Justin Ammon (EdgeRC / birdofprey) that I spotted on…

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Slow Flight with APM - mastering the PID on the edge of stall

Posted on March 13, 2012 at 5:06am 14 Comments

One of the features of extreme high altitude flight is the high true airspeeds that are needed to generate the dynamic pressure required for airborne flight.  To minimise these extreme speeds for my high altitude glider project, I wanted to increase the flyable operation envelope closer to the airframe's stall speed, helping the reign-in the stratospheric true airspeeds!

As I was playing…

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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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