Keltos, I have small drawings of the O.19 and O.21 classes- longitudinal section plus several transverse cross-sections. These two classes were very similar, the only significant difference being the larger beam of the O.19 and O.20 to accommodate the mine tubes.
The K.XIV class and O.16 differed mainly in dimensions with O.19 and O.21, but the differences were not great- a matter of a few feet in length, a few inches in beam. The real differences were in internal equipment (O.16 and the K.XIVs had 8-cylinder MAN four-stroke diesels while the O.19s and O.21s had 7-cylinder Sulzer two-strokes for instance), plus in the percentage of welding which increased in each successive class; in O.16 the percentage was 49%. And, of course, the O.19s and O.21s were originally equipped with snuivers- O.19 was the world's first submarine with what later became known as the Schnorchel, though some sources credit O.16 with being the first.
Be happy to send you the drawings I have, but check with Denis469 first- I sent him the drawings last year and he may be working on them already. Would be a shame to duplicate any effort!
As an aside, our current deputy minister for health, Jet Bussemaker, is the granddaughter of the final commander of O.16, who was killed when O.16 was sunk by a Japanese mine in December 1941.
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