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essais en soufflerie faits par le recordman du monde en cascade (à moto)
Explanation: essai en soufflerie = wind tunnel testing (skiers do it especially for the KL, in order to find the most aerodynamic position for the descent ; cars designer do it, yacht designers have it done to their boats)
recordman du monde = world record holder (commonly used in sporting contexts in the half-English form). I double-checked this with an Alta Vista wbesearch in French & got lots of hits.
www.granddicitonnaire.com (for confirmation of wind-tunnel test) www.fut.es/acfa (for multilingual site of European m'bike stuntrider champion)