Cone bottoms for tanks

This is a draft page for JamsRL's scrutiny.

Forget the hole in the top for the time being so, to find length of sloping side ‘L’ Base dia ‘D’ = 570mm (typical for a 205 litre steel drum, but check before proceeding) hence base radius ‘R’ is half this = 285 Desired angle ‘a’, say = 45° L= R/Cos a L= 285/Cos 45 (Cos being Cosine, available on many calculators or the internet) L = 403mm To address the hole in the top, use the same formula but substitute the diameter of the fitting you want to use for the base diameter, say 30mm Hence if D = 30, R will = 15 l = 15/Cos 45 l = 21.2mm

We are aiming for this shape to roll into the cone,

so we need to know the angle between the two edges (b°). We’ve already calculated L, 403mm. We know the outer arc length (x) is the same length as the circumference as the drum so we can calculate this using the formula C = π x d, where C is the circumference of the circle