SCREW PROPELLER
Screw propeller's calculation methods benefited a decisive step forward, when the functioning of the blades was compared
with rotating wings. The calculation of the relative velocities and induced, due to rotation, combined with the advance of the fluid is essential to define the
twist of the propeller blades. The prediction of performance such as power, lift and torque,relies on mathematical practical tools you will find here (in part) gathered:
The aircraft screw propellers ,
ships propellers ,
fans or ventilations are propulsion type propellers. The blades using the motor torque to accelerate the fluid and generate thrust by reaction. see:(
change of momentum).


Capture the energy of fluids using screw propellers to turn the fluid motion into energy.The propeller becomes a motor.
Capture energy systems like wind turbines , and
tidal turbines or axial turbines use the torque generated on their blades to drive
generators or
pumps machines.


The pitch is defined in many ways that it is important to distinguish. See:
The geometric pitch and effective pitch

calculation methods predict performance,
efficiency and the shape of blade profiles. HELICIEL
is a calculation software all public (because a simple knowledge of basic mechanics, force, torque, power output is sufficient ...) Allowing
calculation of screw propellers,
turbine helices calculation, and
calculation of the wings or hydrofoils.

Heliciel allows the use of
profiles whose performance and
forms are stored in a database, to
produce a 3D model. The
geometric shape of the blades, the
number of blades and the rotational speed can be tested to evaluate thrust, torque and efficiency of
screw propeller, turbine or wing3D model. .
A drawing of blades and profiles can then be edited in 2D or
3D (IGS).