A Rotary Air-data System (RADS) periodically samples pressure data from a main rotor blade mounted pitot-scoop integrated with a high accuracy pressure sensor to compute a velocity vector that is resolvable into the aircraft's coordinate system. Mathematical techniques are employed which provide accurate...http://www.google.co.uk/patents/US6938472?utm_source=gb-gplus-sharePatent US6938472 - Static pressure calculation from dynamic pressure for rotary air-data system and methodology therefor
