Abstract: A hull and gunnel protector for use with trolling motors which includes an U-shaped cover with a hinged panel to access a cushioned internal gunnel cavity. The cushioned internal gunnel cavity is constructed and arranged to accommodate for a variety of geometrically shaped gunnels or gunwale. The cushioning properties serve to protect the hull and gunnel from clamping forces exerted by the trolling motor's mounting clamp.

Abstract: In a recoilless air gun in which opposing pistons are arranged to be propelled simultaneously in opposite directions when the gun is fired, to compress a charge of air to propel a projectile, the pistons are attached to opposing locations on an endless chain or flexible belt extending around spaced apart reversing pulleys, so that as the attachment point of one piston to the chain or flexible belt moves in one direction along one of the runs thereof between the pulleys, the attachment point of the other piston moves in the opposite direction along the other of the runs. The pistons are propelled by respective similar springs so that the effective masses of the springs are also balanced and the flexible belt or chain is required merely to ensure the desired relative positioning of the pistons and is not required to provide the accelerative and air-compressing force for either piston.