| Helicopter
Rotor motion simulator 
Click to go to its download page in Mathworks.com
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This MATLAB tool is to visualize and better
understand the complicated helicopter rotor blade motions
& various reference planes that are used to express the
blade motions.
collective pitching,cyclic pitching, flapping,
lead-lag motions are simulated precisely and one can rotate
or set the rotor blades at desired azimuth.
Orientation of Tip Path Plane (TPP), No Feathering
Plane (NFP), Hub Plane (HP) can be calculated and visualied.
The blade can also be swept all along the azimuth for clear
understanding of the pitch variation.
Understanding the Euler Angles 
Click to go to its download page in Mathworks.com
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In flight dynamics, navigation and 3-D animations,
the use of 3 angles called Euler angles to describe the orientation
a rotated set of axes with respect to another set of axes
is very common.
This tool helps in understanding the angular
motion and transformation which involves 3-D space and projections
(bit difficult for imagination) in a step by step rotations.
For each step, angular components and transformation
are calculated and various elements like path of rotation,
plane of rotation, axis of rotation, set of axes after cuccesive
rotations are included as options.
Note:
Flight and Aerospace engineers, when using
yaw, pitch, and roll (also called heading, attitude, bank)
to refer to rotations about the z, y, x axes, respectively,
often call these the Euler angles.But these x-y-z angles are
properly known as the Tait-Bryan angles, also called Cardan
angles or nautical angles.
A good reference for euler angles can be seen
in wikipedia page
Helicopter Rotor to Fuselage Vibration Transmission Simulator
Click to go to its download page in Mathworks.com
( Keep the mouse pointer over this link for preview )
This is a MATLAB tool to simulate, investigate
and understand the vibration transmission from the helicopter
rotor blades to the fuselage.
One can choose no. of blades and at which
harmonics blade should oscillate, and simulate and visualize
how the rotor vibration will be transmitted to fuselage.
Few visual elements and aids are included
so as to undersand why for a particular combination of no.
of blades and no. of harmonics, the oscillation is transmitted
to the fuselage. For reference, an one per rev oscillation
will also plotted.
My Helicopter course Presentations
As part of my course on "Introduction
to Helicopters", I have presented some presentaions on
fundamentals and aerodynamics of helicopters. Some of those
presentations can be downloaded from the following links.
PPT1
It covers the complete momentum theory and
blade elemet theories of a helicopter rotor starting from
first principles..
PPT2
Extended Momentum theory, Combined Blade
element theory, Tip effects Root cutout and Inclusion of root
Cutout & tip effects are discussed in this presentaion.
PPT3
This presentation deals briefly with Forces
on Helicopter, Helicopter Flight Modes, Blade Collapsing,
Controls, Gyroscopic precession and Helicopter stability.
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