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Old 02-19-2021, 05:16 AM   #1 (permalink)
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Default Drone 'Kill switch' failed...

https://www.bbc.co.uk/news/uk-england-sussex-56112694

This thing must be of some considerable size considering it weighs over 200lbs (95Kg).
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Old 02-19-2021, 05:35 AM   #2 (permalink)
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not heli related

post that in the drone section

just a fyi, you could always delete it.
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Old 02-19-2021, 05:54 AM   #3 (permalink)
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Oops, sorry. Hopefully it can be moved. I don't want to double post.
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Old 02-19-2021, 06:08 AM   #4 (permalink)
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Not really a drone in my opinion.They were lambasted by health and safety and the CAA for being so lax.It hadn't been tested enough.
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Old 02-19-2021, 07:41 AM   #5 (permalink)
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Well, that is DHL struck off my list of preferred carriers
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Old 02-19-2021, 03:38 PM   #6 (permalink)
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Default Relative Size...

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Old 02-19-2021, 07:51 PM   #7 (permalink)
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No one thought the much anticipated package drones would be small, right? After all, these are a major factor in Remote ID laws.
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Old 02-19-2021, 09:32 PM   #8 (permalink)
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Stand back please, this is dangerous stuff. That's why we are the only qualified pilots that should be able to fly drones. You don't know what you are doing with your toy helicopters and quads. These are serious machines. Yours are dangerous.


In all honestly, it looks right good on them that they screwed this up. And like I jokingly said above, they think that they are the only ones qualified to fly any drone and all the rest of us should be banned from flying. Pompous idiots. I hope it sets their plans back decades.

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Old 02-19-2021, 10:03 PM   #9 (permalink)
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They couldnt be bothered with fan shrouds. Nope. Lets make a flying guillotine.
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Old 02-19-2021, 10:14 PM   #10 (permalink)
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They couldnt be bothered with fan shrouds. Nope. Lets make a flying guillotine.

Aerodymamic effects at the lip of the duct make shrouded props that size a positively stable ducted fan which is a bad thing for a racing drone. The effect will constantly be trying to stabilize the multirotor and working against it moving forward.
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Old 02-19-2021, 10:25 PM   #11 (permalink)
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Quote:
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Aerodymamic effects at the lip of the duct make shrouded props that size a positively stable ducted fan which is a bad thing for a racing drone. The effect will constantly be trying to stabilize the multirotor and working against it moving forward.
Sounds like the duct should be variable with a machine that size.
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Old 02-20-2021, 12:13 AM   #12 (permalink)
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More details today about this crash. This is an utter clown fiesta, clearly built by a bunch who know nothing about standard RC practices such as failsafes. The bloody control system is on a breadboard!!

https://www.theregister.com/2021/02/...investigation/

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Old 02-20-2021, 12:17 AM   #13 (permalink)
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Look at the quality of that kill switch, and the soldering on that!

https://www.gov.uk/aaib-reports/aaib...slash-a-040719

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Old 02-20-2021, 01:04 AM   #14 (permalink)
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Quote:
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Sounds like the duct should be variable with a machine that size.

Look up "ducted fan multirotor" on youtube. Lots of people have tried this thinking it was a great idea. It is not.
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Old 02-20-2021, 01:16 AM   #15 (permalink)
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What the hell, there are online services that will make one off PCBs at very reasonable prices. I was looking at having 10 small double sided PCBs made and the cost was something like $20 total
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Old 02-20-2021, 02:46 AM   #16 (permalink)
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The Airspeeder website is all lovely and shiny, with major sponsors:
Airspeeder.png

But when you peek under the covers:
  • "The AAIB found that the Alauda Airspeeder Mk II was not designed, built or tested to any recognisable standards and that its design and build quality were of a poor standard. The operatorís Operating Safety Case contained several statements that were shown to be untrue"
  • "At the time of the accident the operatorís staff consisted of a Chief Executive Officer (CEO), one permanent member of staff and several part-time university students."
  • "on 3 July 2019... a test flight was flown at the aerodrome that day using one of the UAs; the CAA were not present for this test flight. This flight resulted in a hard landing due to a loss of power which was later traced to a fault in a battery feeder cable connection"
  • "The electronic control box was removed from the damaged airframe and fitted to the remaining UA for a flight the following day."

A 3m long, 95kg drone, with unshrouded 32" propellers and capable of 80km/h speeds. Was being flown in front of a crowd, in close proximity to controlled airspace, using a hand-soldered control box that was removed from a crashed model the day before....

The RC and modelling hobby, with our safety record that exceeds that of both the UK CAA and the USA FAA is paying the penalty because of drone cowboys like this.



The onboard kill switch had a "fail-dangerous" design. Loss of power to the kill switch kept the model powered. The ground "kill switch" controller is a hand soldered dongle, connected via USB to a laptop, with zero weatherproofing. And required typing a command into the laptop to activate it!
  • "If the kill switch failed to operate, the UA would continue to fly
    until the main battery depleted."

Then they inspected the quality of the electronics and soldering work:
  • "All the assemblies failed an evaluation against all IPC A-610 classes due to quality and workmanship issues"

And I'm not even a quarter of the way through the report.... We wouldn't allow a setup this unsafe to fly at our club field on a 1kg model, the safety officer would ground them until they at least passed the basics of having a model that demonstrates a failsafe.

Heck, over here a failsafe is a mandatory requirement for all models over 20kg!
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Old 02-20-2021, 09:39 AM   #17 (permalink)
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Quote:
Originally Posted by Andy from Sandy View Post
Oops, sorry. Hopefully it can be moved. I don't want to double post.
Moved for you.
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Old 02-20-2021, 03:49 PM   #18 (permalink)
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It wasn't designed by modelers it was designed by drone weenies with no experience building RC models or with what can happen when you do a poor soldering job or fail to protect solder joints against vibration. Look at that breadboard, soldered flying leads all over and no silicone goop or even just secured wiring.


The upside down PCB mounted XT60 also caught my eye, probably installed the battery connectors backwards and then had to either install the PCB side connector backwards or fix the batteries and choose the easier way.


Shame such a nice airframe has such garbage electronics inside of it. It deserves better.
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Old 02-21-2021, 06:59 AM   #19 (permalink)
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Should have said prop guards. Not to provide any sort of duct for the blades but to keep the thing from being a Decapitator 9000 should worse come to worse.


Still dangerous but this does provide some level of protection vs open blades.


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