F1 Pre-season test - McLaren

[#1]

http://www.skysports.com/watch/video/sports/f1/10178267/watch-the-mclaren-mp4-31
Other than the fact that it is slow and has a lovely engine note - what is this with the grills behind the front wheels
Are they worried about something coming off

[#2]

  nice Jim , am looking forward to another season , hope Hamilton can do it again 

[#3]

Airflow sensors, seen them loads of times. Verifying windtunnel/CFD predictions.

[#4]

thanks - that explains it
I am more familiar with pitot tubes for doing that

[#5]

It's a whole matrix of those, or the equivalent.