Up until the end of the Second World War, the building of speed boats became the core business of the Lürssen shipyard - also for export. The boats were built as wooden hulls (Doppelkraweel - mahogany - white cedar) on light metal - frames built from S-100 were armoured with a navigation station. With three Daimler-Benz MB-518 engines, speeds of over 42 knots could be achieved. Due to the favourable underwater hull shape, specially adjusted rudder (Lürssen effect) and an improved foredeck structure, the boats were very seaworthy.