RedactedNarrative: Operator advised that he was recreational cruising in the Delaware River channel just northeast of Pea Patch Island.  Operator stated that the vessel struck an unknown submerged object which caused immediate loss of propulsion, but not engine power.  Operator placed the engine in neutral and then attempted to put into both forward and reverse gear with negative results.  Operator then turned off the engines and lifted the lower unit to see if there was damage, at this time he observed two of his prop blades were bent. Due to strong outgoing tide and sustained winds Operator was blown out of the river channel and onto a gravel/sand bar located at the north end of Pea Patch Island.  Operator then dropped anchor and secured the vessel.