RedactedNarrative: On April 17th, 2021, at approximately 0705 hours, the owner of vessel 2 was launching from the boat ramp at Chickahominy Riverfront Park. As he was backing the vessel into the water the vessel came free from the trailer and traveled backward in the water toward vessel 1. The owner of vessel 2 had a friend on the dock with dock lines that were tied to the vessel while he was launching it. The friend could not stop the vessel, once it came off the trailer, in time to keep it from striking vessel 1. The motor on vessel 2 was raised fully at the time of the collision and was not running. Vessel 2 had a stainless-steel prop on its motor which is what struck vessel 1. There were 4 prominent scratches/gouges on the starboard stern of vessel 1 caused by the prop striking it. The one main gouge was approximately 3 inches in length, approximately 2 inches wide, and was down to the main fiberglass of the vessel through the gel coat. This gouge was below the waterline on vessel 1. Just prior to the collision, the operator of vessel 1 had traveled under trolling motor power from the pier on the left side of the ramp (facing the water) and was getting ready to tie off on the outside leg of the pier to the right side of the ramp. The operator of vessel 1 stated that he had just launched his vessel and was attempting to tie off his vessel when the collision happened. There were no injuries during the collision and the only damage was sustained to vessel 1.