Answer: There is nothing in GOST R51274-99.8 to limit the half apex angle of the skirt. But this is a usual rule, this limitation exists in AD S3/1 4.2 and in CODAP C9.7.1. (French code) to avoid the increase of bending moment due to the horizontal component of the compressive load. Note well: the message (#35) is a Warning not an Error since there is nothing in GOST.
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