Cold (compressed air propulsion)
1904 – 150 kg. air charge; speed 35 knots 5-600 m., 24 knots 5-2,000
m.; 72 kg. combat head
1906 – incremental changes to 1904 model; 108 kg. combat head
1906M (modified) – increased air discharge over basic 1906 model; speed
38 knots 5-600 m.