A Description of the Component parts of the J2 Universal Tool-Kit, and how each provides unique benefits into the aircraft design , build and certification process.

1. The J2 Universal Tool-Kit - Features
Advantages and Benefits
AIRCRAFT MODELLING AND PERFORMANCE PREDICTION SOFTWARE
Key Aspects
RAPID BUILDING OF AIRCRAFT MODELS
Replicating the Aircraft
Any Stage/Any Data
OPTIMISING THE DESIGN
Considering all the Options
CERTIFYING THE AIRCRAFT
Start Certifying Right at the Beginning
Classical Analysis
Supporting Flight Test
AUTOMATIC FLIGHT CONTROL SYSTEM DESIGN
Developing Autopilots and Fly-By-Wire
COMPLETE UNDERSTANDING
Visualising and Viewing the Results
SIMULATION
Fly the Design straight of the drawing board
PUTTING IT ALL TOGETHER
The whole is greater than the sum of the parts
.

2. RAPID BUILDING OF AIRCRAFT MODELS
Replicating the Aircraft
J2 Builder is the main plug-in used for constructing
aircraft models. This enables engineers to build the
models to replicate the aircraft structure so that the
model building is easier and more logical.
The construction of the aircraft model follows a logical
process working with known information of the aircraft
from the first sketch or drawing. This has further
advantages in terms of locating and editing data. This
can save significant time when comparing to other
options.
The user no longer has to search through
multiple text files or FORTRAN code to try to find
the appropriate parameter.
Logical Structure for Aircraft Models
When Building models in Matlab/Simulink it is
necessary to create multiple layers of systems
and subsystems, leading to a complex structure
and hiding scripts and details that should be
easily accessible
Furthermore, there is no need for engineers to enter
information relating to coupled effects etc. The user can
simply enter the aerodynamic, mass or thrust
characteristics of a component and its location, and the
J2 Universal Tool-Kit will total up all the contributions to
work out total forces and moments. This makes the
investigation of different loadings, engine scenarios etc.
automatic within the software. No need to have Complex Models Described using
FORTRAN Code
The net result of this is a much simpler and easier to use
tool for assembling models with complete visibility of all
data.
THIS IS ABLE TO REDUCE THE TIME TAKEN
TO CONSTRUCT AN AIRCRAFT MODEL FROM
OVER 1 MONTH TO LESS THAN 1 WEEK.
J2 Builder removes the need for Complex
Embedded Subsystems with Matlab

3. Any Stage/Any Data
The main reason modelling and simulation
is not used early on in the lifecycle is that
engineers believe that they require lots of
detailed information before they can start
to simulate the aircraft. With the J2
Universal Tool-Kit and J2 Elements, that is
not the case. J2 Elements can take data
from simple wing and empennage
geometry and start to fly the aircraft. This
can come from the original 3-View and
some basic easily available airfoil
information or from more detailed wind
tunnel analysis.
Starting with a Basic 3-View
THESE QUICK AND EASY
METHODS PROVIDE A VERY
EARLY INSIGHT INTO THE
AIRCRAFT BEHAVIOUR.
This can then be used to refine the design
until more detailed information is
available. e.g. Imports from CAD systems
etc.
At each stage through the design lifecycle,
more data is generated regarding the
Instantly Visualise the Behaviour aircraft, and this can be simply merged and
updated with existing models to provide
higher fidelity results.
Eventually, the aircraft will reach
manufacture, with detailed control system
solutions. These too can be linked into the
aircraft model to provide detailed real
hardware/software in the loop testing
through J2 Developer.
THE J2 UNIVERSAL TOOL-KIT IS
CAPABLE OF SUPPORTING THE
DESIGN AND DEVELOPMENT
CYCLE FROM CONCEPT TO
COMPLETION.
THERE IS NO NEED TO PURCHASE
OTHER TOOLS AS THE PROJECT
Graphically Connect Airborne Software into the Model DEVELOPS.
for Increased Fidelity

4. OPTIMISING THE DESIGN
Considering all the Options
Being able to build a single model quickly already
gives significant advantages in the process of
modelling and simulation. However, it is unlikely
that the first option considered is the correct
solution. To this end it is necessary to perform
trade studies and optimisation. If considering
different options with the classical text file
approach, the easiest way is to take a copy of the
original design, and then make modifications.
This presents 2 problems.
1) The changes required may require
changes to many different aspects of data
stored within the file. This approach is
prone to error as areas get overlooked or
the data is incorrectly adjusted due to
lack of visibility of the complete picture.
2) If the original idea is modified, so the user
has to go into the alternatives to make
the same changes.
Changing a Single Number Gives an aircraft with a
different Fuselage Length and Tail Position
With such a lengthy approach combined with the
potential for errors, numerous options are not
always considered. With the J2 Universal Tool-Kit
investigating numerous options, modifications
and variations are not a problem. The J2
Universal Tool-Kit and J2 Builder provide the
ability to create delta models. The delta models
are a reference back to the original aircraft, and
the user only needs to add the changes. This
instantly reduces the work required to look at
variation.
REDUCE WIND TUNNEL TIME
THROUGH THE ABILITY TO CONSIDER
THE IMPACT OF ALL CHANGES ON
PERFORMANCE AND BEHAVIOUR
Instantly View and Compare the Impact of the Change
Furthermore, if the baseline model is modified, the delta model is automatically updated requiring
no user intervention. This can significantly reduce the potential for errors. This means that the user
can continually evaluate multiple options.
THE DESIGN TEAM CAN EVALUATE MORE OPTIONS AND IDEAS IN HALF THE
TIME USING THE OUT OF THE BOX CAPABILITY OF THE J2 UNIVERSAL TOOL-KIT.

5. CERTIFYING THE AIRCRAFT
Start Certifying Right at the Beginning
Whilst an aircraft performance is its main
design feature, aircraft cannot fly without
being certified. Unfortunately Aircraft
Certification is an intense, lengthy and
costly process. It is not one that is wished
to be repeated unnecessarily. With this in
mind, the J2 Universal Tool-Kit provides
the ability to fly the complete certification
process from the very beginning of the
design.
FLY THE FLIGHT TEST PROGRAM
FROM THE FIRST IDEAS
This ability to focus on the end minimises
wasted time investigating areas early on in
the lifecycle which are not the driving force
of the design. This improves the efficiency Build Complex Certification Manoeuvres Graphically
of the design and engineering resources.
When the certification is considered from
the beginning of the design process, it is
easier to make changes that may have
resulted in re-design later on. By the time
the aircraft is ready for the wind tunnel, all
options and ideas have been considered
and investigated, not only with respect to
performance, and there is a great deal of
confidence in the proposed airframe.
As each update is made it is possible to
simply re-run the test envelope and
manoeuvres ensuring the certification
standards are always met.
See the Results and Establish whether the Aircraft will get
Certified.
THE AIRCRAFT CAN BE CERTIFIED AND RE-CERTIFIED ON THE COMPUTER,
PROVIDING A GREATER PROBABILITY OF SUCCESS DURING THE REAL
CERTIFICATION.

6. Classical Analysis
Whilst the J2 Universal Tool-Kit works with
non-linear models covering the complete
flight envelope, there is always the need to
investigate and demonstrate compliance to
standards when it comes to certification.
This requires the linearisation of the
aircraft at points around the envelope and
the investigation into the classical modes of
motion and corresponding characteristics.
These characteristics are then assessed
against standards to demonstrate
compliance. All this capability is inherent
in the J2 Classical plug-in.
VIEW INSTANTLY HOW A NEW
DESIGN COMPARES TO THE
STANDARDS. Comparison of Airspeed and Altitude on SPO
Characteristics
J2 Classical fully automates the process of
conversion from non-linear to linear
models, the calculation of the modes and
the comparison to the standard criteria.
Templates built into the system supply
boundaries and limits for different phases
of flight with an integrated capability in J2
Visualize to create user defined templates
to cover in-house criteria or additional
Figures of Merit.
State Space models are also generated
which can then be used for the further
rapid development of AFCS.
Investigating Open and Closed Loop Characteristics over a
COMPARE THE IMPACT OF AFCS range of Airspeeds
ON THE HANDLING QUALITIES
DURING ALL PHASES OF FLIGHT.
All these features means that there is a reduced workload on the engineers to calculate and
evaluate the characteristics leading to an increased knowledge of the aircraft and how it compares
to standards leading to reduced certification times.

7. Supporting Flight Test
Even at the end of the design phase,
as the flight test program has started,
the J2 Universal Tool-Kit is still a
major tool to assist in the evaluation
and planning of the flight test
program.
Data from the flight data recorder can
be automatically imported into the
software. This can be used to
construct manoeuvres which can then
be run to evaluate how the predictive
model compares to the real aircraft.
The predictive model can then be
updated to flight match the real
aircraft. Using Flight Test Data to create manoeuvres for Flight Matching
Subsequent test flights can then first
be flown using the J2 Universal Tool-
Kit and the results presented to Test
Pilots. This enables pilots to see and
view the test flight before they start
and demonstrates what they can
expect.
PILOTS DEVELOP CONFIDENCE
IN THE AIRCRAFT AND IN THE
AIRCRAFT MODEL THROUGH
THE ABILITY TO TEST, UPDATE
AND RE-TEST.
Comparing Predictive and Actual Data

8. AUTOMATIC FLIGHT CONTROL SYSTEM DESIGN
Developing Autopilots and Fly-By-Wire
Most modern aircraft have some
form of Automatic Flight Control
System (AFCS) in its simplest terms;
this can be a height/heading hold
autopilot. On military aircraft this
can be developed to correct for
unstable airframes, and provide
different controller options for
different flight regimes. With
Unmanned Aircraft the AFCS can be
used for automatic waypoint
navigation and extended to support
swarming and many other options.
When designing an AFCS, industries
most common tool is
Matlab/Simulink. This is a very
flexible tool for developing any sort
of control system. Unfortunately,
this requires the engineer to put all
Drop Aircraft Model straight into Matlab/Simulink FCS Model the aerospace knowledge into the
tool. When running analyses, the
engineer has to develop complex
models for the aircraft, and is only
able to run one case at a time.
These are both time consuming
processes, and can result in fewer
options and ideas being considered
over a smaller subset of the
preferred envelope.
The J2 Universal Tool-Kit and the J2
Matlab Toolbox are able to
overcome these problems,
seamlessly integrating the System
design capability of Matlab/Simulink
with the aircraft models and batch
capability of J2 Universal. Aircraft
Taking the Aircraft and FCS model and Running Analyses models built using J2 Builder can be
Across the Whole Flight Envelope
“dropped” straight into a
Matlab/Simulink system design model, and the FCS Designer can concentrate on the development of
the FCS rather than the construction of the aircraft model. These models can then be brought back
into the J2 Universal Tool-Kit for detailed analysis across the whole flight envelope.
THE ABILITY TO FOCUS EFFORT ON THE FCS DESIGN AND EVALUATE ACROSS
THE COMPLETE FLIGHT REGIME GIVES UNLIMITED FLEXIBILITY.

9. COMPLETE UNDERSTANDING
Visualising and Viewing the Results
The analysis side is only part of the
capability of the J2 Universal Tool-Kit.
There is further power and capability
through the use of data displays and
visualisation. Integrated into the J2
Universal Tool-Kit are J2 Visualize and J2
Virtual.
J2 Visualize gives instant cross plots,
time histories, traces and data monitors
allowing engineers to see the results as
either post processing or as data are
generated.
Drag Curve Generated from Cross Plot of Multiple Trim Conditions
J2 Virtual provides a 360° playback
capability giving a complete
understanding in real-time in a scaled
environment of the aircraft behaviour.
Different scenarios and designs can be
compared automatically without the
need to transfer the data to other
applications. This saves time and helps
to minimise mistakes.
Data from CAD packages can be
imported so that users can view their
aircraft and see how it flies. Comparing Different Scenarios to Assess the impact of change
STATE OF THE ART
VISUALISATION INCREASES
UNDERSTANDING AND
DEMONSTRATES THE TRUE
CHARACTERISTICS OF THE
AIRCRAFT
Comparing Flights in a 3-D Real Time Playback

10. SIMULATION
Fly the Design straight of the drawing board
The integrated graphics capability ensures a full and
detailed understanding of the aircraft’s behaviour
throughout the project. However, sometimes it is
necessary to “feel” the aircraft behaviour, and to
understand how the numbers and charts relate to
the pilot. This can give a better understanding of
Pilot Induced Oscillations, pilot reaction delays, and
how putting a man into the system can have a
further effect on the overall behaviour of the aircraft.
With classical simulation, to enable aircraft models to
be converted into real time simulation models
requires the development of tables, and the
development of simulation code. This means a
further lengthy and complex process, which results in
real-time simulation being left until the very end of
the design process, or for pilot training.
Desktop Simulation enables Engineers to get a
WITH THE J2 PILOT PLUG-IN, IT IS real “feel” of the aircraft
POSSIBLE TO FLY ANY AIRCRAFT AT ANY
STAGE IN THE DESIGN PROCESS.
Automatic interfaces are already in existence, which
means no code is required to be written or data files
exported. The plug-in can automatically interface
with any model in the system and fly-real-time.
As the project develops, it is necessary to get Test
Pilots to evaluate the aircraft. With J2 Pilot, the
same flight models and software used to drive
desktop simulation can be integrated into Motion
Platforms and Full Mission Simulators to enable
continuity from design to evaluation and test. This
represents a significant cost saving on the
development of simulator models as they can be
taken straight from the engineering solutions without
additional effort and rework.
Using J2 Pilot to Drive a Full Motion G-Cuing Seat
providing further feedback to Pilots for Enhanced
Pilot Training

11. PUTTING IT ALL TOGETHER
The whole is greater than the sum of the parts
The J2 Universal Tool-Kit contains a series of plug-ins that provides different functionality for
different aspects of flight modelling and performance analysis. Each plug-in is designed to enable
engineers to develop solutions faster at any stage in the design cycle. There is a removal in the
reliance of each engineer to developer their own code which results in a cottage industry of
spreadsheets and small applications that leads towards inefficiencies in projects due to the continual
maintenance and tweaking.
Fully integrated tool-kit, eliminating the need to switch between applications to build models, perform
analysis and visualise results.
However, the benefits do not stop with the functionality and capability of each plug-in. When all the
plug-ins are merged into the J2 Universal Tool-Kit there are further benefits through the use of a
consistent platform. The J2 Universal Tool-Kit provides central integrated application using
consistent data and a common platform with seamless communication between engineers and
disciplines.
THIS MEANS IMPROVED COMMUNICATIONS, AND AN ELIMINATION OF
POTENTIAL ERRORS CAUSE BY DATA TRANSFER, RESULTING IN A MORE
EFFICIENT AND COHESIVE PROCESS.
On top of this is an integrated version control and configuration management system that ensures
that all individuals are working with the latest version of information. Furthermore management
can observe the process, keeping track of workloads and project performance.

12. IT TOOK J2 AIRCRAFT DYNAMICS’ AEROSPACE ENGINEERING AND AIRCRAFT
DESIGN SPECIALISTS OVER 10 YEARS TO BUILD THE ‘CODE’ THAT ENABLES THE
UNIVERSAL TOOL–KIT TO INVESTIGATE ALL ASPECTS OF AIRCRAFT HANDLING
AND PERFORMANCE.
WE HAVE DONE ALL THIS SO THAT YOU DON’T HAVE TO.
This state-of-the-art, but easy-to-use software PLUG-INS
suite gives you unprecedented power to design
J2 Builder
and ‘fly’ multiple configurations of the complete An easy-to-use graphical interface that
flight envelope in a 3-D virtual environment – all rapidly develops aircraft models and
at the click of a mouse! When using the J2 builds multiple variants for comparison
Universal Tool Kit, you can save hundreds of
thousands of dollars by streamlining your J2 Elements
process, maximizing your analysis capability and Enables automatic calculation of total
aerodynamic coefficients and derivatives
reduce the risk of serious project flaws. through integrated strip theory.
J2 Developer
At the heart of J2’s A Software Development Kit (SDK) for all
software is the J2 users to write their own components and
Universal Framework, libraries with an interface into J2 Aircraft
Models.
a cutting-edge
configuration control J2 Freedom
Provides flight dynamics simulation of
and data management aircraft data models, allowing you to
platform that hosts all evaluate the complete flight envelope.
steps of the design
process. Everything J2 Active
we offer begins and An open COM interface that instantly
interacts with this key integrates your existing design packages
with the power of the J2 Universal Tool-
framework.
kit.
J2 Matlab Toolbox
Get the full capability of J2 with Simulink
Now it’s time to investigate our range of plug- Model files. Manoeuvres from within J2
ins. ‘Mix and match’ their additional design and can be flown on Simulink Models. Run all
analysis capabilities using floating licenses. Take analyses from within J2 Universal Tool-
control of a bespoke package that perfectly fits Kit.
J2 Visualize
your requirements. This way, you get Instant understanding and evaluation of
the right functionality and maximise the return aircraft behaviour through data
visualization and graphic displays.
on your investment.
J2 Virtual
View any results in a virtual 3-D real-
ARE YOU READY TO RETHINK THE WAY YOU world, to understand what exactly
DEVELOP YOUR AIRCRAFT? happens during unexplained/complex
manoeuvres
J2 Pilot
To find out more about J2 Aircraft Dynamics, Using the J2 Pilot plug-in’s automatic
interfaces/models you can fly aircraft on
our software and our consultancy services, visit your. You can also use J2 Pilot interfaces
www.j2aircraft.com to merge the finished design into pilot
training simulators.