What is the best causal scale-space for 3D images

An adjustable outboard motor mounting to be secured to the transom of a boat and support the mounting brackets of a motor, the device having a flanged plate slidable up and down the transom in channeled guides, and having spaced hydraulic piston and cylinder rams operatively mounted between upper and lower brackets, the lower brackets being fixed to the guides and the transom, and the upper brackets, the plate, and the motor brackets being secured together for unitary motion, the hydraulic rams lying in a plane parallel to the transom and located between the transom and the center of gravity of the motor.