Here is a Bordeaux wine barrel preliminary model, created with basic geometry.
The barrel curve profile was approximated with a 2 point clothoid. Unwrap and revolve of 10 and 20 degrees were used to create the bent staves.
Flow of the outer and inner surface, (together), of a bent stave, was used to make the unbent stave, using the centerline of the outer surface, to its unwrap.
Staves may be cut with a constant angle, in a curved jig. The unbent staves show the curve.

http://www.damy-cooperage.com/barrels-bordeaux-french-oak.aspx
Height: 95 cm
DiameterTop: 55 cm
DiameterMiddle: 70 cm
Stave Thickness: 2.7 cm
Capacity: 225 liters

The unbent staves may have a tiny inaccuracy in their curvature. (?)
Yet to do: croze, chime, bung hole, hoops, Keyshot rendering...

- Brian