VOITH LINEAR JET

In practical terms we can say it is a hybrid with a propeller spinning inside a pre shaped tube like a water or hydro-jet. The main difference between the two is that the Voith Linear Jet engine’s tube is considerably shorter and is installed under hull. These hybrid features mean that the VLJ functions more efficiently than a propeller does and of a hydro-jet where these two engines begin to be less efficient at speeds exceeding 20, 25 knots when talking about propellers and of speeds below 40 knots when talking about hydro-jets. Accordingly the VLJ represents the ideal solution especially for those boats which carry out multiple functions: patrol shifts at a mere 15 knots or at 35 plus knots when on a rescue mission. Or as a yacht heading for another destination at just 15 knots or maybe at 30 or even 35 knots accordingly. Any way there’s an undisputed speed gap from about 20 and 35 knots. A hydro-jet is excellent at speeds exceeding 35 to 40 knots but is less efficient and uses up proportionally much more fuel. A propeller driven vessel looses efficiency from around 20 to 25 knots as cavitation sets in with vibrations and unwanted noise. Voith Linear Jet engines nearly always remain efficient (70% of potential) throughout the whole speed gap. This feature means it is best exploited in boats that do not require constant speeds but a wide operational speed range instead. VLJ engines also maintain positive features “borrowed” from two conventional engines: the propeller ones which are just as