 The distance from the top of the 1 st secondary mahovogo pen to the top of the wing more than half the length of the wing or equal to it (figure). The wing is no less than eight times longer than the bobbin. The distance from the top of the 1 st secondary mahovogo pen to the top of the wing significantly less than half the length of the wing. The wing is less than eight times the length of bobbin.
Fig. Wing village swallows: Yes - the distance from the top of the 1 st secondary mahovogo pen to bend the wing, b - the distance from the top of the wing to the top of the 1 st secondary mahovogo pen
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