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I Couldn’t Believe It!
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<blockquote data-quote="spartavel" data-source="post: 54195" data-attributes="member: 10896"><p>Take care you have people speaking of Seagulls and Cormorans attacking their Spark. It seems the spark is tiny enough that they are not scared of it. They seem to consider them as a human tool competitor against their fishing territory since they seem to also go after the human piloting the drone, as if they fully understand who is in charge. They also seem to study the drone first and know how to take it down fast. Birds are known to see things much better and faster than humans. They see flicker at up to 150 images per second (humans are at 50 per second at best - in lower light it's 15). So birds may detect better the blades spinning. A 10000 rpm blade which is probably the maximum rotation on a spark mean a little bit more than 150 rps, mean that a bird is close to detect the rotation. However, when staying still the Spark may be at 5000 or 7000 rpm which makes it around 75/100 rpm which is bellow the upper limit of detectable movement of a bird. So a bird sees and knows how the spark stays in the air.</p></blockquote><p></p>
[QUOTE="spartavel, post: 54195, member: 10896"] Take care you have people speaking of Seagulls and Cormorans attacking their Spark. It seems the spark is tiny enough that they are not scared of it. They seem to consider them as a human tool competitor against their fishing territory since they seem to also go after the human piloting the drone, as if they fully understand who is in charge. They also seem to study the drone first and know how to take it down fast. Birds are known to see things much better and faster than humans. They see flicker at up to 150 images per second (humans are at 50 per second at best - in lower light it's 15). So birds may detect better the blades spinning. A 10000 rpm blade which is probably the maximum rotation on a spark mean a little bit more than 150 rps, mean that a bird is close to detect the rotation. However, when staying still the Spark may be at 5000 or 7000 rpm which makes it around 75/100 rpm which is bellow the upper limit of detectable movement of a bird. So a bird sees and knows how the spark stays in the air. [/QUOTE]
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I Couldn’t Believe It!