[ENG] SAN LORENZO SL106 – Hybrid power DIESEL CENTER – The Boat Show


(emphatic musical tones) (gentle music) – [Narrator] A port like any
other, a day like any other, and a yacht, well, a
yacht not like any other. It’s a San Lorenzo SL106 model. It is 32 meters long,
and seven meters wide. It has four double cabins, and
can counsel a crew of five. It is equipped with a
16 cylinder MTU engine, rated at 2,400 or 2,600 horsepower, and then it has two electric engines. Why? What are they for? (speaks in foreign language) Today we’ll have a sensory
experience that we’ve never tried before on a motor yacht. Right, we use the sound level meter. Here at the dock, in a very quiet area, the noise is 46 decibels. Keep this value in mind. (mid-tempo electronic music) (speaks in foreign language) The navigating bridge is huge, but really, it will be enough to have a single display showing the navigation
data, engine controls and the switchboard. (mid-tempo electronic music) Now we start the engine. (speaks in foreign language) We don’t hear any noise, we have started the electric motors, and
now we use them to maneuver. (speaks in foreign language) We are about to set
sail, we’ve disconnected the shore power, and enabled the two powerful generators called Hygen. (mid-tempo electronic music) 44 decibels less than the
value we recorded outside, of course we are inside the wheelhouse, but we are sailing at 10 knots, running on electric motors. (mid-tempo electronic music) 42 decibels, the owner’s
cabin is even more silent than the wheelhouse. Here one rests well, even at sea. (mid-tempo electronic music) (speaks in foreign language) Here the noise is 52
decibels, we are in the lounge on the main deck, and the
engine room is just below. However, this light
noise seems to come from, oh, I understand, it’s
coming from the wake. (waves spreading) (mid tempo electronic music) I climbed aboard the support
boat to record from here the noise of the passage
of the 106 San Lorenzo. (yacht engine running quietly) Running on diesel engine,
the noise is recorded by the sound level meter
at 68 to 69 decibels. Now let’s see switching to
the electric propulsion. (yacht engine running quietly) When in electric mode, the
boat is even less noisy from the outside. (jazzy electronic music) How have they managed to
make a yacht of this size navigate so quietly? Its weight is 115 tons at half load. To make it simple, try to imagine the equivalent weight wise of five trucks moving at about 20 kilometers per hour, without making a sound. This achievement is the result
of an innovative installation designed and built by Diesel
Center, an Italian company based in the province of La Spezia. For many years it has specialized in large yacht propulsion
systems and more. Here they have installed a
hybrid diesel electric drive. (jazzy electronic music) (speaks in foreign language) Even though the name Diesel
Center makes one only think of internal combustion engines, we actually have a dynamic
and innovative company, that has invested heavily
in new technologies, especially in believing and knowing the life onboard a yacht. (speaks in foreign language) Life onboard of yachts
means pleasure, fun, comfort and substantially, wellness and health. For us, the diesel propulsion
is key, it is reliable, and the core of our hybrid drive. Our aim is to make sure
that the boat is always highly dependable, mostly
because the boat carries you and your guests, family and friends. Our highest priority is
always the reliability and safety at sea. (jazzy electronic music) (speaks in foreign language) Our second priority is the comfort. Comfort doesn’t always go along with the traditional diesel propulsion, like in the case of these
big propulsion engines designed for these large yachts. A good solution is to
combine electric motors with diesel engines. The outcome is a versatile
propulsion system that can use either output properly, and according to day to day needs. (speaks in foreign language) For instance, during high speed sailing, it’s possible to use the
traditional diesel engines, instead when cruising near the coast, and enjoying those beautiful
coves and landscapes, it’s possibly to actually listen to the nature surrounding us. Which is what we are
interested in at that time. The quiet electric propulsion
allows us to do all this. Or, if your guests like to
take a dip, it’s also possible to switch up all the
internal combustion engines and power the utilities of this yacht, like electric cookers, air
conditioning, entertainment, and so on, with zero emissions for both the air and for the sea. So whoever goes swimming around the boats will never smell foul
odors, or even see traces of oil floating on the sea surface. For us, the comfort onboard,
is very well enhanced by this kind of technology. (dreamy electronic music) (speaks in foreign language) The propulsion system is
called full parallel hybrid green technology, and it’s
composed of two diesel engines, two electric motors, two
generators, and a high tech system for the onboard energy control. (soft rock music) (speaks in foreign language) One of the main difficulties
of this type of propulsion is the integration of traditional
diesel electric propulsion with the electric one. The engines are built by MTU,
one of the most important manufacturers of diesel engines for ships, and for pleasure or commercial crafts. MTU also builds engines
for many other vehicles, from locomotives to
earth moving equipment. In short, it is a global giant. (soft rock music) (speaks in foreign language) The electric motor is
designed and manufactured by Diesel Center, but
will be produced by MTU. It has been designed in such
a way to have the same torque of the diesel engine, up to the rate of 1,000 revolutions per minute, but is actually a lot smaller. It has the equivalent output of approximately 180 horsepower, while the 16 cylinder MTU
diesel develops a power of over 2,400 horses. (soft rock music) (speaks in foreign language) The two motors are working
on the same propeller shelf and are coupled together
through a clutch to be able to be used either separately
or at the same time. (trumpeting soft rock) On board, the power can
be supplied by either the shore connections, or can be generated by diesel generators. Alternatively, it’s possible
to use the electric motors that when coupled to the diesel engines, work as alternators. The electric power produced
is controlled by this unit, but also monitors the battery charge. (speaks in foreign language) Onboard the San Lorenzo,
technology is at its highest level. These generators, for
example, are designed with permanent magnets,
and variable revolutions depending on the power demand, delivering up to 150 kilowatts. If we use the generators
of equivalent power with traditional technology, they would occupy half of
the entire engine room space. These are instead quite small. (dreamy electronic rock music) (speaks in foreign language) These lithium ion batteries
are able to accumulate up to 150 kilowatt hours of energy. Equivalent to the current
used by a family of three in an ordinary apartment in a month. (laid back rock music) (speaks in foreign language) To sum it up, thanks to this technology, you can rest at anchor, perhaps
in a beautiful pristine bay, without emitting any exhaust
gasses, and making no noise. (laid back rock music) When cruising with eclectic propulsion, it’s possible to sail very quietly, and without producing any exhaust gas. The yacht and all its
utilities can be operated for over nine hours in the
zero emission power mode. In displacement, it’s
very convenient to use the electric propulsion,
since only 120 kilowatts of energy are enough
to sail at nine knots. To make it simple, it’s
like this mega yacht is propelled by a 150
horsepower outboard engine. Amazing, isn’t it? (laid back rock music) When the batteries are low, it’s necessary to switch on the diesel
generators that are able to produce the necessary
energy and extend the use of the electric propulsion. (laid back rock music) (speaks in foreign language) Now I have activated the
economic navigation mode, and the system is optimized
for minimum fuel consumption. (speaks in foreign language) Just observe, here a
diesel engine is running, while the other is off, because
on the shaft, right now, it’s enough to clutch the electric motor to have the propellers
rotate the same way. The other electric motor is
working as an alternator, driven by the diesel engine, and all other generators
are off to save fuel. (speaks in foreign language) In this configuration, the
fuel consumption decreases up to 30% at 10 knots, due to the fact that only one diesel engine is turned on. (inspiring soft rock music) Right now the total fuel
consumption is 62 liters per hour, not only for propulsion
uses, but also to feed all the electrical services on board. (inspiring soft rock music) If also the other diesel
engine is turned on, the combined fuel
consumption is 42 plus 37, which gives 79 liters per hour. To this value, it’s necessary
to add the consumption of two electric generators,
since we don’t have one of the electric motors working
as an alternator anymore, and it’s still necessary to produce energy for onboard utilities. (dreamy soft rock music) (speaks in foreign language)
Alright, the fuel saving is evident, but is the San Lorenzo SL106 also able to go fast? One, two, three, four, just a
few seconds and it’s planing. The bow rises slightly, but
what increases above all else are the revolutions and the speed. I pushed hard, look at the
engines at their maximum speed. 2,350, 2,360 revolutions per minute. And the speed is 25.2 knots. It’s also possible to
activate the boost function, and what’s happening? We are driving the
propellers with four engines. The two diesel, and the two electric. And the speed is 26.8 knots, 26.9. Wow! (stirring soft rock music) (speaks in foreign language) With the electric propulsion
noise and vibration are reduced to a minimum, and you can also sleep while sailing, when you stop at anchor to swim, all electrical services on
board will continue to operate, powered by onboard batteries with no emission of exhaust gasses. And finally, thanks to a
reduction in consumption by about 30% in displacements, well, the advantages of this
full parallel hybrid green technology system, designed
and built by Diesel Center, become quite clear. (emphatic musical tones)

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