An extension of the model of the gravitational scattering by moonlets in pl
anetary rings to collisional diffusion is presented. The resulting typical
propeller-shaped structures bear the chance to deduce the existence of larg
er(> 100 meter) embedded bodies in planetary rings. Their spatial extension
s provide estimates for the size of the embedded bodies and they contain in
formation about the physical properties of the surrounding ring-material li
ke the kinematic viscosity, mass-density, mean free path and collision freq
uency. The induced structures lie in the range of the resolution of the Cas
sini Imaging experiment, and thus, could be observed in near future.