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airspeed measurement
For UAVs this type of airspeed sensors is used:
Arduplane Airspeed sensor (> 10 EUR, > 20 EUR the kit with tube): http://www.aliexpress.com/item/Ardupilot-Arduplane-Pitot-Air-Speed-Meter-Airspeed-Gauge-Tube-for-APM-2-5-2-6-APM2/32322446850.html
maybe it is usable in our context?
Sensor is: MPXV7002DP ~10EUR
Data sheet: https://www.freescale.com/files/sensors/doc/data_sheet/MPXV7002.pdf
needs 5V supply
Some details about Test/Votages: http://diydrones.com/forum/topics/airspeed-sensor-not-working