Rohrvortrieb

Rohrvortrieb is a German term that refers to a method of propelling ships through water using a fluid, typically a liquid, in a closed duct or pipe. The flow of fluid through the duct creates thrust, propelling the ship forward. This type of propulsion is commonly used in certain types of specialized vessels, such as airships and submarines.

The working principle of Rohrvortrieb is based on the conservation of momentum. As the fluid flows through the duct, it accelerates, resulting in a force opposite to the direction of flow. This force is what propels the ship forward. In airships, Rohrvortrieb is used in conjunction with lift created by lighter-than-air gases to provide both propulsion and buoyancy. Submarines use a combination of Rohrvortrieb and propeller-based propulsion systems.

Rohrvortrieb has several advantages, including high efficiency at low speeds and the ability to operate quietly. However, it also has limitations, such as the requirement for a stable flow of fluid and the potential for clogging or blockages in the duct. The use of Rohrvortrieb as a primary propulsion system is relatively rare, but it is often used as a supplemental system to enhance maneuverability and stealth.

Historically, Rohrvortrieb was used in early airships and submarines, where the need for quiet and efficient propulsion was critical. Modern vessels have largely moved away from Rohrvortrieb in favor of more conventional propulsion systems. However, there remains a niche for Rohrvortrieb in specialized applications where its unique advantages can be exploited.