Emmanuel Pil
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I know it's all about drag and lift, but why doesn't the wind drag this bird backwards?
Because the bird was slope soaring. The camera was on a structure. Wind was forced upwards, over the structure, so the bird was gliding forwards relative to the airflow, while maintaining its altitude.Emmanuel Pil said:I know it's all about drag and lift, but why doesn't the wind drag this bird backwards?
And downwards relative to the airflow.Baluncore said:Wind was forced upwards, over the structure, so the bird was gliding forwards relative to the airflow, while maintaining its altitude.
Yes, gliding.russ_watters said:And downwards relative to the airflow.
Where was the beach interface to the water (hint: it wasn't open water)? Why do I ask that question?Emmanuel Pil said:So here is another one above open water. What now?
Are you hoping for something supernatural here? The bird is taking advantage of the wind currents; there is no magic or supernatural stuff going on, obviously.Emmanuel Pil said:If the answer is: wind blowing upwards and bird gliding downwards relative to the airflow, I just don't see the right angle of the bird's wings. Something awkward here.
That bird is slope soaring on the sea breeze, in air rising up the gentle slope of the beach and the dunes.Emmanuel Pil said:So here is another one above open water. What now?
Rising air is often used by birds to reduce the energy cost of flying.Emmanuel Pil said:I just do not consider the answer that the bird uses an upward windblow the correct one.
But the shoreline is where the photographer stands, and the shore must be rising ground. The wind only needs to blow diagonally onto the shore to rise.Emmanuel Pil said:See here a tern hovering above a river. No hills, no dunes.
No, no! Please don't leave! We can give you the answers that you want...Emmanuel Pil said:Well, maybe I'm on the wrong forum. Thanks anyway.