History | Big Jets | Variable Inlet | Variable Nozzle

Development History

Jet Boat Efficiency


The System and How It Works Why It All Works Together Company History *Why It All Works Together* Bigger jets are desirable because they create higher thrust. But the bigger the jet, the more power that is lost in the ordinary inlet duct. This power loss has to be made up by the motor and the pump. The adjustable inlet duct reduces this power loss. And, as the inlet duct becomes more efficient, it increases pressure on the nozzle, which results in higher flow through the system. But, higher flow through the system results in reduced pump efficiency. Hence the need for the variable nozzle to regulate the system flow for pump efficiency. Summary: Using the combination of these three innovations means a high volume of water, an efficient inlet duct and an efficient pump operation under all operating conditions.		Essential Performance Features Larger flow for increased thrust. *Intelligent inlet* for power recovery. Adjustable nozzle for pump efficiency. Practical Engineering Features Inlet molded in boat hull. Flexible motor placement. Engineered for ease of installation.

*The System and How It Works.* Back to Top
	Larger Jet Size increases propulsion efficiency using technology demonstrated in development of larger jets in aerospace industry.
Full Throttle at 15 mph
	Intelligent Inlet Duct automatically adjusts to recover the power of the incoming water at all planing speeds and at all throttle positions.
Full Throttle at 35 mph
	Variable Rectangular Steering Nozzle allows simultaneous control of nozzle area and steering direction to maintain peak efficiency over wide ranges of boat speed, pump shaft speed and steering vectors.
Full Throttle at 50 mph

Company History

The development of IntelliJet Marine, Inc. began when current president, Jeff Jordan, was considering the purchase of a manufacturer of aluminum jet river boats. Mr. Jordan had previously spent ten years in the design and manufacture of small commercial hydroelectric systems, during which time he observed several causes of hydraulic inefficiency in the marine jet propulsion systems.

Any such cause of inefficiency is rigorously attacked in the hydroelectric business because it translates into power not generated and revenue lost. In jet boats it translated into the need for a flatter hull, a bigger motor and a bigger fuel tank.

In jet boats (inefficiency) translated into the need for a flatter hull, a bigger motor and a bigger fuel tank.

The application of hydroelectric design principles to jet boats resulted in three broad patents covering the inlet, pump and nozzle control conditions that must be maintained for efficient marine jet propulsion.

The Variable Nozzle

The variable rectangular steering nozzle allows simultaneous control of nozzle area and steering direction to maintain peak efficiency over wide ranges of boat speed, pump shaft speed and steering vectors.