The wing is a delta in the form of an equilateral triangle with a span of four body diameters. Wing section is a symmetric cylindrical arc with a relative thickness t/c of 4%. Leading and trailing edges of the wing should be rounded with a radius equal to 0.002 D. However, this specification is unclear. It is obvious that the specified radius can not be applied near the wingtips, or large deformations in the plan form of the wing would occur. In the past, this part of the specification was interpreted in different ways by model designers which led to small differences in shapes of the tested models. The recommended solution is to have the leading- and trailing-edge radii of 0.002 D at the theoretical root chord and to decrease the radii towards the wing tips proportionally to the local chord.