Ron van Maanen has information about the Amsterdam jacht Jager. I wondered if this was the Jager that was in Brazil and returned in June 1652. Ron says that the Jager was built in 1650 and was last mentioned in 1655. The dimensions were 70ft x 22ft x 11ft. The armament varied between 8 and 12 guns and the crew consisted of 40 men (at least nominally).