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We investigate the outcome of collisions in very different mass regimes, butan otherwise identical parameter setup, comprising the impact velocity($v/v_\mathrm{esc}$), impact angle, mass ratio, and initial composition, w.r.t.simple hydrodynamic scaling. The colliding bodies' masses range from $\simeq10^{16}$ to $10^{24}$ kg, which includes km-sized planetesimals up toplanetary-sized objects. Our analysis of the results comprises the timeevolution of fragment masses, the fragments' water contents and fragmentdynamics, where we start with bodies consisting of basalt and water ice. Theusual assumption of hydrodynamic scaling over a wider range of masses is basedon material behavior similar to a fluid, or a rubble pile, respectively. Allour simulations are carried out once including full solid-body physics, andonce for strengthless - but otherwise identical - bodies, to test for theinfluence of material strength.  We find that scale-invariance over a wider range of masses is mostly only avery crude approximation at best, but can be applied to constrained mass rangesif tested carefully. For the chosen scenarios the outcomes of solid-bodyobjects compared to strengthless fluid bodies differ most for our intermediatemasses, but are similar for the lowest and highest masses. The most energetic,planet-sized collisions produce considerably faster and more fragments, whichis also reflected in high water losses - above 50 percent in a singlecollision.

Applicability and limits of simple hydrodynamic scaling for collisions of water-rich bodies in different mass regimes