Cones with/without Flared Necks

Radius of choice, preferably (r = 0.1 r = 0.154 diameter or diameter)
"R" should be designed with us and drafted as far as possible to accommodate existing tools.
Warm or cold-formed, with or without collaring on smallest diameter
Either seamlessly formed from a blank or from raw cones with seams, depending on the geometry.
Diameter: 21,3 until 1220 mm 

α = Aperture Angle    Da = Cylinder Diameter     da = Outer diameter

H = Total height    h1 = Stepped-edge height    R = Knuckle radius

r = Neck Angle Radius    s = Wall thickness    zh = Neck Length