JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 51

up with less wind and a constant annual
output with less noise and mechanical
wear, which is of interest to wind farm
owners, since most of these farms have
reached the end of warranty. The average
length of these warranties is five years,
creating significant cost/benefit problems
for the owners. It has been announced
that in the United States alone, $40 billion
worth of wind turbines are currently at
end of warranty. The Minix device can be
retrofitted rapidly to all VAWT or HAWT
turbines, so is a potential solution for this
problem.

Pollution
Front part of MINIX (upper part) & RV8 Aircraft equipped with MINIX

shape causes a coanda effect and makes it
possible to accelerate the airflow, direct it
towards the interior of the cylinder, and
control part of the rotational movement of
the vortex as soon as it is created.

Land, sea and air applications
Minix Technology has been conducting
wind-tunnel, numerical and real flight
tests on 28 different prototypes for the
past 15 years. This new wing-tip device
is now available for commercial aircraft,
racers, gliders, ULMs, unmanned air
vehicles, and helicopters (blades) (Some

More information

A twofold problem: not only do wing-tip vortices lead to induced drag and therefore to a waste
of fuel, their counter-rotational turbulence can be very violent. There is a potential for serious
accidents, especially around airports, if sufficient intervals between each category of aircraft are
not observed. Each year, air traffic increases by 5%, and it will soon become difficult to circulate in
the airspace due to all this dangerous, invisible turbulence. With MINIX the vortex dissolves faster
which increases safety and allows less spacing/time between each aircraft.

The Minix device reduces energy
consumption on an aircraft by 6% and
leads to a 14% average annual increase in
energy production for a wind turbine.
In aviation and the field of wind energy,
composite materials are used to make
these devices. This includes carbon fibre,
glass fibre, or a combination of both, as a
function of the structural constraints. n

No80 April 2013 /

More information:
www.minix.fr
christian.hugues@minix.fr

Feature Aeronautics

Once the relative wind enters the cylinder,
50% of the efficiency is already achieved.
The acceleration of the air as it enters
the cylinder’s intake creates more of a
negative pressure inside and captures
some of the pressure eddying around the
cylinder, through a helical slit along the
entire length of the device’s second half.
This acceleration will force a number of
mini-vortices out from the wing’s trailing
edge.
The results of the first real flight tests show
net savings in the double digits.

applications require additional testing).
There are also a number of applications in
the marine sector, such as boat stabilizers,
rudders, Lipp rotor blades, submarine
fins and turbine blades, hydrofoil blades,
hydraglider airfoils, and tidal turbine
blades.
All sea and air applications share the same
issues, as vortices (gaseous fluids) and
cavitation (liquid fluids) behave in the
same way (except for density): they cause
drag and noise.
Ground applications include airfoil and
Formula 1 race cars, onshore and offshore
wind turbine blades, etc.
For Formula 1 type racing vehicles, where
the speeds approach those of light aircraft
at around 180 mph (about 289 km/h),
the device is mounted in reverse to invert
lift: the faster the car moves, the more it
“grips” the road and creates less induced
drag in increasing the speed.
For on- and offshore wind turbines, the
problem is the same as for aircraft and
cars, the only difference being that the
wind is active rather than relative. This is
because all productivity gain is based on
Betz’s limit, the consequence being a start-

In 2012, the global air transportation
industry consumed more than 270 million
metric tons of kerosene. To calculate
the CO2 pollution, all you have to do is
multiply that weight by 3.1 to obtain the
tonnage: an incredible 840 million metric
tons of CO2, without even counting the
projected 30,000 new aircraft over the
next few years, or the increase in future
traffic when emerging countries like
China, India, and Mexico (to name only
a few) step up their air transportation
programmes.
There is a different kind of pollution with
wind turbines, which require vast quantities of concrete to attach their bases in the
ground. This in turn uses a lot of energy in
the form of coal or electricity, etc.
A rapid comparison of the long-term
pollution shows that a wind turbine has a
minimum 30-year service life of pollution-free power production, while an
aircraft will pollute throughout its entire
service life!

jec composites magazine 51


http://www.minix.fr

JEC COMPOSITES MAGAZINE - Issue #80 - April 2013

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #80 - April 2013

Cover
Edito
Point of view: hig-end solutuions
Contents
Agenda of Events
COMPANY & BUSINESS In Brief
APPLICATIONS
- Sports & leisure
- Renovation
MARKET
- Singapore
- Education
- Natural fibres
- Biocomposites
FEATURE AERONAUTICS
- Carbon
- Process
- Reinforcement
- Structure
- Bi-angle NCF
- RTM
- Sandwich
- Energy
RESEARCH & DEVELOPMENT
- CAE tools
- CFRP
TECHNOLOGY & INNOVATIONS
- Prepreg
- Material
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Cover
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 2
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Edito
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Point of view: hig-end solutuions
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 5
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Contents
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 7
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 9
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sports & leisure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 12
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 13
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Renovation
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Singapore
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 16
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 17
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 18
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Education
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 20
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 21
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 22
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 23
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 24
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 25
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Natural fibres
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 27
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 29
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 30
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 31
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 32
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Carbon
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 34
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Process
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 36
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 37
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Reinforcement
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 39
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 40
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Structure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 42
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Bi-angle NCF
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 44
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - RTM
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 46
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sandwich
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 48
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 49
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Energy
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 51
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CAE tools
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 53
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 54
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CFRP
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 56
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 57
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 58
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 60
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 61
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Material
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 63
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 64
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Index
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 67
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 68
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