I am not an expert on parachutes, however a few years ago I managed to blag a guided tour of the parachute museum at Brize,Norton they showed me a chute like this that was designed for the parachute instructor to use in the air , in case they got pulled out during training, they had to open the front and chuck it out, and it was on the small side, but the bloke said its better than waving your arms in the air