A novel idea to reduce the resistance of a transom stern hull in displacement and semi-planing modes is investigated. By placing a spoon-shaped device in the recirculating zone behind the transom the momentum of the forward moving water will be absorbed and a pushing force generated on the device. Numerical and experimental techniques are applied on a transom stern hull to optimize the shape and position of the device and to explore in detail the physics behind the gain. At a Froude number of 0.4 the maximum measured resistance reduction is 11% while the computed maximum reduction is 17%. This is for the towed case. In self propulsion with one propeller the measured power reduction is 15%. Unfortunately, the power cannot be computed with the applied propeller model, but the reduction in thrust using the device is 12%. Larger gains are possible at smaller Froude numbers, while the effect is reduced when the Froude number is higher. By splitting the thrust on two propellers even larger gains are possible. Howeeer, the device is not suitable for waterjet propulsion. All results in this report are for model scale. Larger gains are expected at full scale.