The HH 7-11 stellar jet is one of the iconic outflow sources
from young stars. Its jet is peculiar in that it has a very
low-excitation spectrum and no reliably measured motions except
for HH 11. I will present new narrow-band images of the system
acquired with HST that allow us to measure precise proper motions
and determine electron densities throughout the flow. When combined
with existing data, a new picture is emerging as to how the
flow interacts with its surroundings in this very young system.