There is a need for propellant tank slosh dampers that have lower weight, reduced complexity, and reduced development effort. The purpose of the proposed work is to investigate the effectiveness and performance advantages of floating slosh dampers for achieving these goals. The standard method for damping fuel slosh in propellant tanks is a set of baffles. However, these add significant weight, design and analysis work, and manufacturing complexity to a propellant tank. For example, the weight of the Space Launch System Core Stage Liquid Oxygen (LOX) tank baffling is estimated at over 2000 lbs. and involves 6000 parts. This equates to about 3.4 lbs. of baffles per square foot of fluid surface area.