Hi,
Yes, I also found the above comparison surprising. The majority of users (including me) have suspected that the anemometer actually under-reads. However, the "anemometer factor" (calculated from the physical dimensions) is very much at the lower end of the expected range, so indeed it might be expected to over-read.
But most users (including me), particularly of FO stations, are not able to locate their wind sensors "correctly" (i.e. 10 metres above ground with no nearby obstructions), so perhaps FO have built in an "error" to give more realilistic values from a typical installation ?
Cheers, Alan.
Yes, I also found the above comparison surprising. The majority of users (including me) have suspected that the anemometer actually under-reads. However, the "anemometer factor" (calculated from the physical dimensions) is very much at the lower end of the expected range, so indeed it might be expected to over-read.
But most users (including me), particularly of FO stations, are not able to locate their wind sensors "correctly" (i.e. 10 metres above ground with no nearby obstructions), so perhaps FO have built in an "error" to give more realilistic values from a typical installation ?
Cheers, Alan.