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Intelligent
Inlet Duct
The intelligent inlet
duct adjusts to recover the velocity head of the incoming water at
all planing speeds and at all throttle positions. This
higher inlet efficiency is most important in designs based on
larger jets. Larger jets, in turn, are desirable because
they produce more thrust at low boat speeds. This parallels engine
development in commercial aircraft where high-bypass turbofans
move more air through a larger jet for shorter takeoffs.
This combination of larger jet size, efficient inlet duct, and
variable nozzle
allows a 50 to 80% increase in low speed thrust, while increasing
top speed and maintaining higher propulsion efficiency at all boat
speeds and accelerations. These three innovations work
together to approach the limits of propulsion efficiency.
See below for "The System and How it Works" and
"Why it all Works Together".
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Essential
Performance Features
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Larger
flow
for increased thrust.
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Intelligent
inlet
for power recovery.
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Adjustable
nozzle
for pump efficiency.
Practical Engineering Features
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Inlet
molded in boat hull.
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Flexible motor placement.
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Engineered for ease
of installation.
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The System and How It
Works.
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Larger
Jet Size
increases propulsion efficiency using technology demonstrated
in development of larger jets in aerospace industry. |
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Full Throttle
at 15 mph |
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Intelligent
Inlet Duct
automatically adjusts to recover the power of the incoming water
at all planing speeds and at all throttle positions.
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 Full Throttle
at 35 mph |
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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.
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Full Throttle at 50
mph |
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| 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.
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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.
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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.
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.
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The
Patents
To view the
patents, go to:
http://www.uspto.gov/patft/index.html
Click on Patent Number Search.
Enter a patent number noted below.
#5,658,176 “Marine Jet Propulsion System”
#5,679,035
“Marine Jet Propulsion Nozzle and Method”
#5,683,276
“Marine Jet Propulsion Inlet Duct and Method”
#7,241,193 B2
"Variable Marine Jet Propulsion - July 10, 2007
(Click here for .pdf)
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New Contact Info
IntelliJet Marine, Inc.
20623 SE 24th Street
Sammamish, WA 98075
425-200-4246
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