In this interview on NASA Edge Ian Clark, principle investigator for the Low Density Supersonic Decelerator, talked about the environment the parachute part of the system has to operate in:
Parachutes are very fickle devices, particularly supersonic parachutes. When we have to use them like we do at Mars, it’s behind a very large, blunt vehicle. That vehicle is screaming through the atmosphere. It’s punching a hole in the atmosphere. All the air is rushing in behind it to fill the vacuum that it’s creating. That creates a very turbulent, very unsteady environment for the parachute to live in.
The farther the parachute is from the vehicle, the less turbulence there is. So what limits how far away it can be deployed?
If the above illustration shows the 6 m capsule with the SIAD deployed, it doesn't seem to be to scale - the parachute is 33.5 m. Is it of a different parachute and SIAD combination? Does it represent the proportions used in the real system accurately?