The Focus sport was designed as a full blown competitive pattern plane.  The Venus II is an ARF designed to sort of resemble a pattern plane.  The Focus has a much better wing design for flying different maneuvers.  The Focus Sport is based off of the Focus II, which is still a competitive plane up until about Masters.  The biggest difference is the wing and the moments on the plane.  The Focus Sport does fly CONSIDERABLY better than the Venus II.

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