My Cirrus is one of the early ones (1969, s/n 9) and it originally did not have water ballast when delivered. It was added at a later date per a factory supplied mod kit according to the records. This consisted of bags in the wings and dump valve in the lower fuselage. The maximum gross weight was increased from 728 to 860lbs (wet). Unfortunately, the mod was removed long before I acquired the sailplane. It would have been nice to have flown it with water ballast but it does very well without.