福伊特-施奈德（Voith Schneider®）推进器（VSP）是一种船舶驱动装置，该装置可在不改变转速的情况下任意改变推力大小和方向。前进和后退（行进）以及船舶横向（转舵）的操纵是通过对螺距的调整进行的。这种操纵方式赋予了船舶高度的机动性，可在不改变转速的情况下非常精确地控制推力大小和极为迅速地改变推力方向。船只如果装备了两台或多台VSP，即可向任何方向移动，包括横向（侧推）。

VSP主要用于对船只的安全性和机动性要求很高的领域。VSP的特别之处在于其垂直回转轴。推力是由独立摆动的平衡桨翼产生的。

A cyclorotor, cycloidal rotor or propeller, is a fluid propulsion device that converts shaft power into the acceleration of a fluid using a rotating axis perpendicular to the direction of fluid motion. It uses several blades with a spanwise axis parallel to the axis of rotation and perpendicular to the direction of fluid motion. These blades are cyclically pitched twice per revolution to produce force (thrust or lift) in any direction normal to the axis of rotation. Cyclorotors are used for propulsion, lift, and control on air and water vehicles. An aircraft using cyclorotors as the primary source of lift, propulsion, and control is known as a cyclogyro. When implemented on ships, cyclorotors are sometimes referred to as Voith–Schneider propellers.