What is an Alamarin-Jet?
The Alamarin-Jet water jet propulsion unit is a high-quality propulsion unit for boats. It is single-stage axial flow pump which produces a high-volume flow rate and thrust with high efficiency. The jet is located at the back of the boat and receives pump water through an intake at the bottom of the boat. The intake duct leads the water onto the impeller with minimal loss in efficiency and the impeller raises the pressure of the water. This pressure is transformed into flow rate in the nozzle (figure 1, point E). The stator located before the nozzle straightens the flow.
The change in the flow rate creates a reactive force in the direction of the flow, which thrusts the boat forward.
Is a water jet safe?
The jet is extremely safe since the impeller rotates while protected inside the jet, and the grill in front of the water intake prevents large objects from entering the intake duct.
What is a conical impeller housing?
A conical impeller housing allows the impeller to move backward and forward inside the tunnel to adjust the gap between blade tip and tunnel wall.
When beaching often and operating in waters with a lot of sand and silt the resulting wear can cause the gap between impeller blade tip and housing to increase, this has a negative effect on performance and due to the straight impeller housing of other jets it means a ‘wear ring’ must be replaced or impellers must be replaced.
A simple adjustment is required with Alamarin-Jets with no requirement for special tools.
How fast will my boat go with Alamarin-Jet propulsion unit?
Alamarin-Jet estimates a boat’s speed based on the information provided.
Please contact firstname.lastname@example.org and fill in the Application Questionnaire and we will recommend you suitable solution with speed estimation for your needs.
Do I need a gearbox between the engine and the jet?
In most cases, a jet can be used directly without a gearbox or with a 1:1
gearbox. However, if a suitable impeller is not available, a gearbox must be
used to adjust the RPM of the engine to correspond with the jet.