Andrew Chapman
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  • Sydney, NSW
  • Australia
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Andrew Chapman's Discussions

X8 coax thrust induced vibration

Started this discussion. Last reply by Hugues Mar 21, 2015. 5 Replies

senseFly camera hardware hack

Started this discussion. Last reply by Gai May 19, 2014. 6 Replies

Empty KML+GPX files from Plane logs?

Started this discussion. Last reply by Michael Oborne Dec 4, 2013. 8 Replies

Andrew Chapman's Groups

 

Andrew Chapman's Page

Latest Activity

Aaron Boyle replied to Andrew Chapman's discussion UAV businesses in or near Vancouver? in the group Canada
"I see that this is a pretty old feed BUT if anyone is still interested, I went with these guys for coverage: http://www.shawsabey.com/products-services/drone-insurance/"
Nov 30, 2015
Andrew Chapman commented on earthpatrol's blog post AscTec Leading the Way
"Has anyone seen an Octa-V frame for sale?  I've seen a few home-built frames, but none in production."
Sep 6, 2015
Andrew Chapman replied to Daniel Paez's discussion new start with the ebee by Sensefly
"For anyone using eBees, I've just started a user group online with the idea of sharing tips+tricks and discussing issues specific to this platform. Hopefully it can build up into a useful…"
Aug 18, 2015
Andrew Chapman replied to Andrew Chapman's discussion Any UAV businesses or research in Sydney? in the group Australia
"A couple of years later, but looping back on this to say I've joined Australian UAV (www.auav.com.au) to expand their operations into Sydney. We use a mix of eBees (very expensive, but amazingly reliable) and DIY builds for larger…"
Jul 31, 2015
Rob_Lefebvre commented on Andrew Chapman's blog post A Pixhawk powered job for Fox Sports
"Andrew, I totally hear you about trouble booting up an Octo and having is wobbling around while trying to calibrate the gyros.On my large Octo, it is powered by a BEC which includes a fail-safe magnetic power switch. So I connect the batteries, but…"
Jun 15, 2015
Andrew Chapman commented on Andrew Chapman's blog post A Pixhawk powered job for Fox Sports
"Tridge: sounds like a more thorough solution on both counts, good stuff John: camera is a GH4, which is almost the perfect aerials camera in my book. The gimbal is customized from a famoushobby BG003 (added dual bars and aluminium roll bar, both to…"
Jun 14, 2015
John Moore commented on Andrew Chapman's blog post A Pixhawk powered job for Fox Sports
"What camera/gimbal are you flying?"
Jun 14, 2015

Developer
Andrew Tridgell commented on Andrew Chapman's blog post A Pixhawk powered job for Fox Sports
"We'd like to eventually get rid of the gyro calibration step at startup. Instead it would run a filter (possibly the small EKF?) to estimate gyro biases over time, and arming would only be allowed once that has converged. That should allow…"
Jun 14, 2015
earthpatrol commented on Andrew Chapman's blog post A Pixhawk powered job for Fox Sports
"Concrete is full of steel rebar and will impact your RF/mag devices. Here's what a concrete surface looks like before the pour.  "
Jun 14, 2015
Andrew Chapman posted a blog post

A Pixhawk powered job for Fox Sports

Hi everyone, The question comes up from time to time as to whether the Pixhawk is a good alternative to DJI, Mikrokopter, etc for professional use in heavy-lift cinematography. So I wanted to mention this high profile and *very* high risk job we recently completed for Fox…See More
Jun 14, 2015

MR60
Hugues replied to Andrew Chapman's discussion X8 coax thrust induced vibration
"Your vibrations levels are perfect (+1/-1). So what is the issue really ?"
Mar 21, 2015
Andrew Chapman replied to Andrew Chapman's discussion X8 coax thrust induced vibration
"18" CF props from TMotor, they don't get much stiffer than that! Being larger slower turning props I'm guessing this is a frequency thing that you wouldn't get on smaller faster props.  There's approx 10cm spacing…"
Mar 1, 2015
Clarence Casper replied to Andrew Chapman's discussion X8 coax thrust induced vibration
"How stiff are your props? Perhaps you can try stiffer ones, or smaller diameter 3 bladed ones."
Mar 1, 2015
Oleksandr Chendekov replied to Andrew Chapman's discussion X8 coax thrust induced vibration
"I know designers of D-27 engine and SV-27 propfan for Antonov An-70 had some problems with wibrations and extra noise. After initial testing program they put propellers bit far from each other. But you should admit that SV-27 propfan utilizes…"
Mar 1, 2015
Stuart Brookes replied to Andrew Chapman's discussion X8 coax thrust induced vibration
"Another possibility over your idea is a resonant frequency. the single props setups will probably be revving higher than the coax setup to get the same overall thrust. I changed my quad to X8 and didn't see what you have seen, both about the…"
Mar 1, 2015
Andrew Chapman posted a discussion

X8 coax thrust induced vibration

Hi all, Since moving to high-end motors and props I have had very low vibes in all my craft, so I was surprised to run into vibration issues in a recent build, my first X8. I did all the usual things of (re)checking all my motors and props for balance (both hub-wise and length-wise), checking prop tip alignment, etc, but still had the issue.I thought it could be the turbulent air between the coax props that was causing it, and this thing has plenty of thrust to fly with only one prop in each…See More
Feb 28, 2015

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Profile Information

Please tell us a bit about your UAV interest
Quads, planes, long-time RC interest, aerial photography. Started a little sideline UAV businesses in 2013 (www.skymount.com), now back home and doing it commercially with Australian UAV (www.auav.com.au)
Hometown:
Sydney, Australia

Andrew Chapman's Blog

A Pixhawk powered job for Fox Sports

Posted on June 14, 2015 at 10:29am 5 Comments

Hi everyone,
 
The question comes up from time to time as to whether the Pixhawk is a good alternative to DJI, Mikrokopter, etc for professional use in heavy-lift cinematography. So I wanted to mention this high profile and *very* high risk job …
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It’s Okay to Call Them Drones. Seriously, That’s What They’re Called

Posted on June 13, 2014 at 2:05pm 16 Comments

Hi everyone, 

Although it is less of an issue for the DIY/hobby end of things (we all seem able to use the word 'drone' without thinking of hellfire missiles), but I've been getting pretty tired of the argument in wider circles and dancing around trying not…

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Flip and spiral death from 100m, solved

Posted on April 19, 2013 at 4:00pm 8 Comments

I recently had my 4th in-flight motor shutdown on my old 3DR Quad - I think I've finally figured it out so I thought I'd share the story so others can check for the same problem as well as show some logfile diagnosis.



My earlier flip deaths were from quite low so I…

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