r₁ = dₐ 

r₂ = 0,1 dₐ 

h₁ ≥ 3,5 s

h₂ = 0,1935 dₐ – 0,455 s

Volume of the curved section (without shelf height h₁) V ≈ 0.1 (dₐ - 2s)³

Outer surface of the curved section (without shelf height h₁) | Aa ≈ 0.99 * dₐ²

Inner surface of the curved section (without shelf height h₁) | Ai ≈ 0.99 (dₐ - 2s)²

Largest wall thickness | s ≤ 0,01 dₐ; max. 25 mm

If s = minimum wall thickness, please specify on enquiry.