General Barberis 1930s Studies for the Regia Marina -- Groups 1 and 2

[YourChair]

Stefano Sappino's blog has information on these battleship studies:

Regia Marina’s BB Design P1 by General Barberis (Navy Corps of Engineers)

At the beginning of the ’30, the Italian navy conducted a series of studies to identify the limits of battleship design, according to the international agreements or more complex scenarios. T…

stefsap.wordpress.com

In the post, he says:

At the beginning of the ’30, the Italian navy conducted a series of studies to identify the limits of battleship design, according to the international agreements or more complex scenarios.
This design is one of those realized by General Luigi Barberis, commissioned by Admiral Gino Ducci, Regia Marina’s Chief of Staff.

Barberis’ work was group in three set of studies:

• group one, units up to 14.000 tons, 147 to 205 meters length, 3 triple 203 mm. or 3 double 305 mm, 28 to 36 k speed;
• group two, units up to 20.000 tons, 169 to 228 meters length, 2 triple 305 mm. or 4 double 305 mm., 28 to 36 k speed
• group three, units over 26.000 tons.

The P1 design belongs to the group three, all the specs are reported on the drawing.

(Source: Progetti di corazzate per la Regia Marina, Michele Cosentino, Storia militare)

In his posts, he only provides information about 4 of the Group 3 designs. Does anyone have information about the Group 1 and Group 2 designs? Group 1 is especially interesting because one of the armament layouts would correspond to a heavy cruiser, perhaps a follow-on to the Zaras.

 

[A Tentative Fleet Plan]

Michele Consetino's article in Warship 2023, The Italian Navy and the Battleship in the 1930s: Theory and Practice doesn't have much more technical information than Stefsap's articles other than to point out that Group 1 was numbers from A1 to E5, Group 2 from F1 to M3, and Group 3 from N1 to S4 (with the letter O being omitted to avoid confusion).