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Jet Propelled power

Jet Propelled power

Jet Propelled power

(OP)
I have an Australian designed 21foot half cabin fibreglass cruiser called a 'Savage Marlin' that is nearing completion & I have purchased a used 'Noen' jet with an 8inch impeller diameter which will be driven by a small block V8 350 chev  engine. What advantages & disadvantages will I be running into?

RE: Jet Propelled power

Jets tend to be a little indeterminate at low speed as the aggressiveness of output is a flow volume function. This can be a little problematic if you are working in an area with relatively stout currents (e.g., docking perpendicular to the flow in a river) where the physical space constraints prevent the throttle required to adjust position; an excellent answer to this is the addition (at a fairly substantial cost) of bow or/and stern thrusters.

If you can find one, the Hinckley picnic boat uses jets and thrusters with a joystick control and can literally walk sideways; I am told that bayliner has added a jet/joystick option to one of their boats.

Having replaced my fair share of props, I like the concept of a jet, but the low speed considerations can be overwhelming depending on where you boat.

RE: Jet Propelled power

Forgot on the first posting to tell you that there is an Australian manufacturer of jet drives who markets as a Hamilton; they have an excellent engineering/installation guide which would be  worth procuring.

Truck

RE: Jet Propelled power

Jet drives can be temperamental, and need to maintain close clearances to perform well. Too much clearance between the impeller and tunnel will cause cavition.  Sand can be a problem, causing wear. Make sure parts are available.  I am in the process of replacing 3 P-Jet units do to corrosion around the stainless steel sleeve in the tunnel causing the sleeve to go out of round.

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