This test clearly indicates that the durability of the series type drogue should be adequate for prolonged operation under severe storm conditions.
The test sample was intended for use in drag tests, not durability tests. The cones were rather crudely sewn and it is both surprising and encouraging that they did so well.
It probably would be a good idea to sew a small reinforcing tape along the forward edge of each cone. This would reduce the possibility of tearing the material when retrieving the drogue over the transom of the boat.