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 Thomas J Coyle III's blog post Secret Service: Drone that crashed on White House grounds was being used recreationally
"If the White House spoofed GPS signals to defend against unwanted Phantoms, the pizza delivery would be delayed"
Tuesday
Andrew Rabbitt replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"What you're talking about Rob is apparent drift.  In manned aircraft and with heading gyros, this is traditionally compensated manually either by reference to compass or by an open-loop correction schedule when magnetic north is…"
Tuesday
Andrew Rabbitt commented on Thomas J Coyle III's blog post Secret Service: Drone that crashed on White House grounds was being used recreationally
"It might have been recreational use, but I bet he didn't inhale..."
Tuesday
Andrew Rabbitt replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"I'm curious why Anna spends her time spamming every forum known to man asking the same dumb questions.  Really Anna, noone actually knows how long the piece of string is! If you'd invested the same amount of time you spend on forums…"
Monday
Andrew Rabbitt replied to Anna Tian's discussion Best open source autopilots v.s. commercial autopilots for conventional fixed wing unmanned aircraft usage
"I'll bet there would be very few in the AP industry who haven't had a look or a fiddle with an APM or Pixhawk..."
Monday
Andrew Rabbitt commented on Blucraft's blog post Design an Airplane in 1 Minute
"I can't for the life of me figure out why you'd only want to spend a minute designing an aircraft."
Sunday
Andrew Rabbitt commented on Gary Mortimer's blog post Trappy ended up paying
"It's a civil claim, not a criminal finding. In fact nothing was found at all in the end! If the FAA had rolled over they would be liable for Trappy's expenses so they were never going to do that. Only reduce their claim to a value that…"
Sunday
Andrew Rabbitt commented on Mark Harrison's blog post Crazed Maniac Flies Drone Through Congressional Hearing!
"Smart move!  If it had lost control and ripped one of the reps heads off, Colin could just blame the French :D"
Jan 22
Andrew Rabbitt commented on Gary Mortimer's blog post Trappy ended up paying
"I didn't realize the NTSB was a judicial body."
Jan 22
Andrew Rabbitt commented on Andrew Jawitz's blog post Making History- The DIY origins of the Luftwaffe
"I should also add that wing sweep does really bad things to the stall characteristics too, further limiting the minimum speed of a swept-wing Nürflugel.  Like Wayne, I have been CFD'ing my way towards a flying wing design of my own…"
Jan 21
Andrew Rabbitt commented on Andrew Jawitz's blog post Making History- The DIY origins of the Luftwaffe
"I'm with Wayne on this one.  A Nürflugel isn't (necessarily) more efficient than a conventional aircraft because the maximum practical lift coefficient you can achieve is somewhere around the 0.7-ish mark.  There's also…"
Jan 21
Andrew Rabbitt commented on Chris Onyando's blog post KENYA CIVIL AVIATION AUTHORITY FINALLY SPOKE
"They've neglected to disguise their overlordship in enough bureaucracy.  Amateurs!"
Jan 20
Andrew Rabbitt commented on Andrew Jawitz's blog post Making History- The DIY origins of the Luftwaffe
"Nice one Bob.  Correcting someone's use of their peddels (sic) and faps (sic) also makes one look like a boob... ;)"
Jan 20
Andrew Rabbitt replied to Niall Woodward's discussion Unpowered Glider from Space
"You will stall above the critical angle of attack.  The problem is that this angle reduces fairly significantly with reducing Re.  Might be 16° at sea level, whereas could be less than 10° up high.  Adding control deflections…"
Jan 20
Andrew Rabbitt replied to Niall Woodward's discussion Unpowered Glider from Space
"The jetstream winds can be hundreds of mph, so between the ascent and descent it can move a long way away from the launch point.  The aim of getting it to fly as early as possible is to be able to recover the position, so there's no need…"
Jan 18
Andrew Rabbitt replied to Niall Woodward's discussion Unpowered Glider from Space
"Me too! :)"
Jan 15

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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