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It is very eassy to distinguish betwen a Safire 1 from a Safire 2. Meassure the width on the bottom center cell, 10 cm behind the leading edge reinforcement tape (to avoid the reinforcement tape shrinkage) Meassure now the width on the bottom center cell, 10 cm away from the tail (to avoid the tail shrinkage) When a Safire 1, this meassurement at the tail is about 18 mm wider than this at the leading edge. If it is a Safire 2 then both dimensions are the same.