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The Jet must be submerged at least up to boat propulsion the Jet driveshaft to prime when the vessel isstationary.For vessels with low transom emerson, modifications to the hull may benecessary.· A deadriseboat propulsionof a minimum of 8° is recommended at the transom to avoidboat propulsionair enteringthe Jet intake.· Appendages such asboat propulsionkeels/strakes should be kept clear in front of the Jet intake, inorder to stop possible cavitation. (Refer Pacific Jets for the correct distance as thisdistanceboat propulsionwill vary depending on Jet Model selected).The basicboat propulsioninformation required to select a TWIN DISC JETS Jet to match an engine and vessel iscontained in the APPLICATION CHECKLIST.Once this information is available it is possible to select an appropriate Jet Model (or multiple of
Jets).Each Jet Model has maximum recommended displacementsboat propulsionat maximum power inputs. This issummarized in the JET SELECTION - BY DISPLACEMENT table.boat propulsionTHESE SELECTION TABLES are a guide only and utilize only one factor in the selectionprocess (DISPLACEMENT). Other factors including waterline length, engine selection,hull shapeboat propulsionand intended usage influence the final Jet selection for optimum propulsiveefficiencies.2. Tables assume that the hull shape selected is suitable for the intended use and speed.The Jet is installed correctly and thereboat propulsionare no keels, appendages or aeration.3. Laden displacements listed in the table are MAXIMUM. Displacements well below themaximum All Up Weight (A.U.W.) are required for best propulsive efficiency.4. A.U.W, in the grey area will generally result in reduced propulsive efficiencyboat propulsionand mayhave application restrictions.5. Table assumes that the trim of the vessel is optimised for the intended use and speed. ALL APPLICATIONS MUST BE CHECKED BY TWINboat propulsionDISC APPLICATION DEPARTMENTS PRIORboat propulsionTO ORDER OR CONSTRUCTION, ESPECIALLY APPLICATIONS WHICH FALL IN THE SHADED DISPLACEMENT AREAS The Speed Guide Table relates powerboat propulsionto weight ratios (HP/Tonne)boat propulsionfor a given WATERLINE LENGTH (W.L.L.) to boat speed. With a known engine HP, the A.U.W. of the vessel and the W.L.L., plot aboat propulsionvertical line from the W.L.L. to the HP/tonne curve and draw a horizontal lineboat propulsionto read off the boat speed (knots). If the engine power is not selected, but W.L.L. and expected boat speed areboat propulsionknown, plot a horizontal and vertical line, and their intersection will give the required power to weight ratio(HP/tonne).Once the required power to weight ratio (HP/tonne) is established fromboat propulsionthe Speed Guideboat propulsionTable, thetotal power requirement is obtained by:For multiple Jet installationsvdivide total power by the number of Jets to give the power outputrequired per engine.Select anboat propulsionengine HP, atboat propulsionleast equal to or greater than that required from the Speed Guide Table.Theboat propulsion.

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