Patent ID: 7588846

Claim:
An energy storage system pod for use in an environment characterized by fluid flowing relative to the pod so as to define forward and rearward pod directions, comprising: a first tank for containing a first reactant; a second tank for containing a second reactant, one tank of the first and second tanks being a larger tank, and the other tank of the first and second tanks being a smaller tank, wherein the larger tank is forward of the smaller tank; a fuel cell stack including a cathode and an anode, the fuel cell being configured to react the first reactant at the cathode with the second reactant at the anode to produce power; and an outer shell containing the first tank, the second tank and the fuel cell stack, the outer shell forming an airfoil-shaped profile having a leading edge facing substantially in the forward direction, wherein the airfoil-shaped profile defines a camber thickness that varies along a chord line of the airfoil-shaped profile, wherein the larger tank extends substantially across the airfoil-shaped profile at its point of greatest camber thickness, and wherein the smaller tank is narrower than the larger tank in the direction of the camber thickness.