The external BOW and STERN THRUSTER
Docking without compromise !
EXTURN – Basics
The idea for tunnel thrusters came up in the 70´s and wasn’t
worked over since…concept is outdated !
EXTURN has been invented by an experienced group of sailors and designed by highly
qualified engineers in 2003/2004. After extensive tests of the entire system and all components
in a sophisticated test channel and on test boats, EXTURN has been released for sale in 2007.
Marinno is the only thruster company with inhouse testing environment.
Constructional Benefits:
+ sealed unit, fully protected drive components
+ no explosion risk
+ great installation/operation convenience
+ maintenance-free
EXTURN – Benchmarking Results
 Best performance - ideal leverage, no cavitation
 Lowest electricity consumption – approx.50%
 Shortest and easiest installation – no hull destruction
EXTURN
tunnel
 No waiting and drying time – mountable during season
 Least interior space requirements
pivot point
 Longest run-time - motor cooled by seawater
 Min. 80 % less noise emmission
 Competitive system costs – lowest installation/running costs
 Completely maintenance-free – no anode and spare part changes
EXTURN‘s Performance Benefits
 Most forward to the bow, better leverage
 Short transverse channel
EXTURN
tunnel
 Deeper under the water line
 No ventilation of the propeller
Minimum 40 % more efficiency as comparable tunnel-systems
Considerable shorter reaction time
pivot point
EXTURN‘s Hydrodynamic Shape
The hydrodynamic shape of EXTURN results in minimal drag, it is comparable
with a folding propeller! Experienced regatta sailors couldn’t measure
speed loss using GPS. Mathematically EXTURN results in a maximum speed
loss of 0.2 knots at 10 knots cruising speed.
EXTURN creates less drag then tunnel thrusters – Why?
The flow speed at the tunnel´s position is minimum twice as fast as
at the bottom of the hull with EXTURN (see cross section of hull).
This results in at least the fourfold retention force for a tunnel thruster
which slows down the boat significantly.
EXTURN – System Components
Remote control & Receiver
Relays
Joystick
Joystick
E-BOX
Batteries
EXTURN
EXTURN – Installation Scheme
EXTURN – Designed to Last
Components from and
assembling in Germany,
Switzerland and Austria.
Adapter
Made of hard rubber, optimizing
the flow characteristics and ensuring tight
and simple mounting.
Hollow shaft with cable routing
made of steel with neopren and rubber
fittings to seal connection and perform
as suspension.
Electric motor
Marinno-designed and special
built motors guarantee outstanding performance.
Up to 5 minutes
nonstop operating time.
Endurance approved for
more then 200 hours….
…20 years – lifetime.
Maintenance-free !
Exturn housing
Extreme robust, special coated
Aluminium housing.
Seawater-resistant and redox-free.
3-Blade-Vector-Propeller
purpose-designed by Marinno
to ensure highest efficiency.
E-BOX – Unique Offering
EXTURN is only system which comes with an E-BOX at no extra charge :
 Operation of up to 3 controls
 Easy Plug & Play connections
 Automatic command among different controls
 Automatic shut down of the controls in case of inactivity (10 min.)
 Temperature monitoring of motor (flashing LED on control panel)
 Gear protection – delay of redirecting (left / right)
 Compatible to non-EXTURN control panels
Relays – Designed to Last
Even with the relays EXTURN relies on quality :
 Waterproof capsuled special relays (IP 65)
 Maximum function warranty (200 A continuous current)
 No malfunctioning – installation in any position possible
 Design prevents sticking of contacts even at continous use
 Extreme high durability
Electricity Consumption & Supply
 Lower power consumption (- 50%) at higher performance
 Longer operating time with less battery capacity
 Minimum self-discharging even after long breaks
 DC / DC-Converter for simple charging of 24-V-batterybanks
 Unique battery protection system prevents discharging of batteries
 Compact battery dimensions – easy transportation
24-V-batterybank
Controls
Joystick with safety button
 On/Off switch to prevent unintentional operation
 Overheating indication by flashing LED
 No viscous shifter mechanism
 Child-proof lock
 Safety class IP 67
Controls
Remote Control & Receiver
 On/Off switch to prevent unintentional operation
 Waterproof and Floatable
 Within a short time connectable (Plug & Play)
 Integrated bracket
 No interaction with other RC equipment
 Automatic switchoff for battery protection (after 90 sec.)
Maintenance & Operation
EXTURN
tunnel-system
Propeller after breakage
Propeller after breakage
Circuit breaker after overload
Circuit breaker after overload
Anodes
Carbon brushes (motor)
Various gaskets
Oil change
EXTURN – Installations on Sailing Boats
 EXTURN as bow thruster for sailing boats
 EXTURN as stern thruster for sailing boats
With regard to the hull shape and materials, there are no restrictions with EXTURN!
EXTURN – Installations on Power Boats
 EXTURN „integral“ as bow thruster for power boats
 EXTURN „vertical“ as stern thruster for power boats
 EXTURN „extension“ and „hut“ as stern thruster for power boats
With regard to the hull shape and materials, there are no restrictions with EXTURN!
EXTURN
Length: 550 mm
Weight : 19,5 kg
Lateral cut: 165 mm
EXTURN DUPLEX
Length : 980 mm
Weight: 35 kg
Lateral cut : 165 mm
© 2008 MARINNO maritime innovations GmbH