The type 9
was similar to the type 16 type sharing the same improvements of the type 7-P
type. Length 105 feet and a displacement of 227 (light)-265 (submerged) tons.
Average
achievements of the design on official trials. The guaranteed achievements were
somehow slightly lower. For surface purposes fitted out with a gasoline engine.
In the
so-called light condition was the maximum speed 11 knots, endurance 60 hours
and the range 660 nautical miles. With the cruising speed of 8,5 knots was the
endurance 120 hours and the range 1.020 nautical miles.
In the
so-called intermediate condition was the maximum speed 10 knots, endurance 60
hours and the range 600 nautical miles. With the cruising speed of 8 knots was
the endurance 120 hours and the range 960 nautical miles.
In the
so-called submerged condition carrying a periscope was the maximum sustained
sped 8 knots, the endurance 4 hours and the range 32 nautical miles, at 7 knots
an endurance of 9 hours and a range of 63 nautical miles and with a speed of 5
knots respectively 30 hours and 150 nautical miles.
In contrary
to the 8 was the type 9 fitted out with twin screws and was the auxiliary
machinery doubled.
The
armament was similar to the Type 16 designs although the number of torpedoes
she could carry with her was increased to another two. Strangely enough the
E.B.C. did not recommended to do this.
Source
Archive Kon. Mij. De Schelde 1875-1960 (Municipality
Archive Vlissingen) T 214.802. 
