• I hate to be the guy that evokes a MythBusters episode. . . but. . . .

    They addressed this in their 'drone' episode.  Long story made short:  only the largest drone in their quiver, with carbon blades, did damage to human flesh.

    I understood this FoxNews story as "that thing can put your EYE out young man!!".

    I would submit that the specific chances of eye injury are 1 in 10 million flight hours, with the results being non-life-threatening.  Bad, but not catastrophic.

    No, I won't be the first guy to have a drone sucked into an airliner intake, nor crash into a crowd of people.  

    • I didn't see the Mythbuster episode. I may need to watch it.

      It puzzles me that anyone would think that my drone with PLASTIC props wouldn't cut someone.  Me.  If I got a hand in one of those blades, it would do some serious damage.

      I get AMA magazine - have for years. If you look there at the safety articles, there are numerous examples of the damage props do.  I think we should be careful about giving the impression that ONLY CF props are dangerous.  Maybe that's not what you meant to say, but if so, I don't believe it.

      I'm not going to test it on myself, but the evidence I've seen says that the speed, size, shape, and power of the prop are what matter most.  I could be wrong, but I'm going to err on the safe side.

    • Santa Claus….

      Tooth fairy…..

      Easter bunny….
      High RPM Carbon fiber blades can’t cut flesh….
      LOL sorry man just messing with ya. Hey they might not cut your arm off Tony but no way would I want 'me' stopping those props! I don't care what myth busters says if CF props get you hard and fast, your gonna have a very bad day.  You are right your not gonna be the first person to crash into a crowd of people... too late. re- airliner I swear I heard on MSNBC a drone almost got sucked in a 747 @ 40,000 feet... lol Or was it drones cause global warming I forget... :p Either way I'm not worried about that I'd be more worried about a goose on the runway because we don't eat enough of them these days.
      Just for the record I don't think prop guards should be mandated. I was just curious if there were any new ideas out there beyond plastic prop guards. 
  • Some chop saws and table saws have a sensor that detects if the blade touches flesh and stops the blade. I think it detects ground much like a GFI outlet installed in kitchens and bathrooms. That would be interesting if it could be incorporated in our MR's however it would seem that is so touchy a false positive could in the end cause more potential for personal injury that not having that at all. And last I checked CF and nylon aren't conductive. 

    Another thought is what if the props have a designed weak point near the hub that would snap off if it hit something? I know that's not perfect but if you've ever heard a MR crash into a bush or tree there are those dreaded couple seconds as it continues to hack away at the leaves and branches. If that's your body those couple seconds could be the difference between a few stitches and hundreds. But again... would the props malfunction thus causing unnecessary crashes / danger? 

    If a motor that is spinning suddenly is stopped by force doesn't the amperage spike for a second? Could the pixhawk detect this? ESC's have brake mode... could that be incorporated to be instantly turned on? If the esc's had a separate 'safety wire' that if powered up would hard 'break' all the motors if the controller sends it the signal. 

  • I have a child and I fly multies for more than 3 years now, my son Is four. I imagine what the family is going through as at 2 years age we had a life and death injury situation (not multicopter related). Multicopters are no toys with open blades, they cut and slice through flash and bigger props crash bones, once I've been testing a gimbal on a bigger machine on my drive way and got carried away, didn't account for the added weight and "touched"  a fender of the neighbor car slicing right through the plastic. ended up buying guy a new fender :) 

    long story short. exercise caution as those things can and will cause extreme injuries and property damage. IMHO it would be a great idea if all multicopter manufacturers would put a paper warning sign on each blade similarly how they do with the the rotation arrows, especially RTF versions like phantoms, solo and others. 

    • Good idea Artem.

  • I don't think prop guards or flimsy props would help, really.  I mean, suppose that instead of cutting someone, it simply landed on their head from 100 ft?  The fact is, a 3 lb (or 1 lb, or 5 lb) quad is a dangerous object if it hits you.

    I believe in not flying near people, though I confess I have done so.  This is a sober reminder to me, to remember that my quad is a flying lawnmower.  This is very sad.

    Having said all that, if prop guards WOULD work and would make it safer, I would consider them. But I would not want them to be mandated.

    • I agree it would be even more dangerous to have one land directly on your head from a hundred feet. Not good! But I think it's probably more likely on average for people to get clipped with a prop.

      I just wish there were options for the DIY drone to install on their own. Maybe there is but I haven't seen any. 

    • One good move would be to ban carbon props, they have very minor benefits but add significant danger.

  • Richard,

    bumbers protecting propellers are installed by a number of manufacturers of drones by default.

    It's up to the regulator to remove unsafe/ not-safe drones from the market

    (US Trade Department)


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