Surfing the Coast of NZ

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sli0701948's picture

Do you happen to know what the sound means? Sound like a metal detector. Altitude changes?

 

You might like autogyros if you're into flying contraptions. (01:47)

 

 

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sal9000's picture
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variometer. it measures air pressure so it lets you know where lift is. the sounds tell you if its lift or sink and how much. like a metal detector for air pressure

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