Matioupi
First Officer
Flight distance : 922569 ft
France
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While trying to test assess max range of the Spark I realize that's its quite hard to keep it in visual line of sight because it's so small...
Largest dimension when flying away is about 15 cm which is about 1 minute of angle at 500 m away.
1 minute of angle is often considered to be the "standard maximum" angular resolution that one can achieve ( https://en.wikipedia.org/wiki/Visual_acuity )
Actually, I'm able to eye track the Spark to about 700-750 m if it's in front of a cloud where there is higher contrast (but not on blue sky where I loose it around 500 m)
Do you think about a safe, convenient and easy way to make the spark looks bigger (for testing purposes) ?
I was thinking about a slightly (weighted or not) ribbon (like on kites) that would hang underneath but I'm afraid that it would get in the propellers during transit at 50 km/h.
For landing, I could catch the ribbon as the Spark goes down.
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