"To understand this you need to look at the following drawings. There you will see what forces are created in a conventional single engined airplane and how the design of Blohm und Voss became more stable.

Forces on a conventional airplane. Here you see what forces are present on a conventional airplane. There is a moment created by the rotation of the engine and prop. The airflow that hits the tail creates a left turn.

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Forces on the BV 141. The center of gravity, which is placed to the right of the geometrical center, compensates the moment created to the engine and prop. The drag of the fuselage compensates the tendency to turn to the left created by the airflow that hits the tail. There is no longer the tendency to turn to the left."