[3][c] 30 tons of coal were carried,[4] giving an endurance of 2,600 nmi (3,000 mi; 4,800 km) at 12 knots (22 km/h; 14 mph).

[2] Testing, which was delayed by ice in the Baltic, showed a number of problems, including vibrations at high speed, cracking of the propeller shafts and failure of hull frames in the ship's stern.

Attempts to rectify these faults included reinforcing the hull and experiments with different propellers, but were only partly successful.

[3] While both torpedo boats had similar stability and seaworthiness,[2] Natter continued to suffer from vibrations at high speed, which prevented the German-built ship from reaching its contract speed due to fear of vibration-induced [5] These problem stopped the German-built ship becoming fully operational, and was instead used as a mobile torpedo-battery at the port of Pola (now Pula in Croatia).

[1] At the outbreak of the First World War, Tb 18 formed part of the Minesweeping flotilla of the Pola Local Defence Forces.