Haack series
Unlike all of the nose cone shapes above, the Haack Series shapes are not constructed from geometric figures. The shapes are instead mathematically derived for the purpose of minimizing drag. While the series is a continuous set of shapes determined by the value of C in the equations below, two values of C have particular significance: when C = 0, the notation LD signifies minimum drag for the given length and diameter, and when C = 1/3, LV indicates minimum drag for a given length and volume. The Haack series nose cones are not perfectly tangent to the body at their base except for case where C = 2/3. However, the discontinuity is usually so slight as to be imperceptible. For C > 2/3, Haack nose cones bulge to a maximum diameter greater than the base diameter. Haack nose tips do not come to a sharp point, but are slightly rounded.

翻译：
Haack系列
不像其他的头锥，haack外形不是由几何图形构成的，它是数学推导出来的使阻力最小的外形。
改变C的大小，可以得到各种形状的haack曲线，C有两个值是有特殊含义的：
C=0 记号LD 在指定的长度和直径下，阻力最小。这个也就是常说的Von-Karman曲线
C=1/3 记号LV 在指定的长度和体积下，阻力最小
如果C不等于2/3，haack系列头锥在接合处（根部）并不是与箭体完美相切的，但这一点点不连续的地方影响很小，几乎可以忽略
C>2/3时，头锥的直径会比基部直径还大
haack系列头锥的顶部是有点圆弧的，（而不像计算出来那样）是尖的。




头锥形状决定的是形状阻力，
表面微观结构决定的是摩擦阻力，
建议把整流罩弄得光滑一些。。。