This parametric program calculates Nasa Bend
and Naca Duct shapes.
The 'NASA Bend' is
known as a parametric optimum bending shape for pipe media flow. Variants of the unique
shape (red in pictures) can often be seen in Formula 1 air intake ducts for
manifold optimization, gas
turbine exhaust ducts and race head port runners. It minimizes the
in a bended pipe, by other means turbulence and flow resistance.
The 'NACA Duct' is known as an optimum intake duct shape,
originally invented in 1945 for
aircrafts. It allows air to be drawn into an internal
duct with a minimal disturbance to the flow.
The ramp angle and the curvature profile of the walls creates counter-rotating
vortices which deflect the boundary layer away from the intake and draws in the
faster moving air, while avoiding the form drag and flow separation that can
occur with protruding inlet designs. Common applications are race vehicles and
The Bimotion NASA Bend and Bimotion NACA Duct Excel programs are intended to be
used with the Catia V5 3D models. The cad models are parametric and linked to
the Excel programs. When ever the Excel program is changed and saved, the cad
model described by the Excel plot window will update automatically. The cad
models can however be rebuilt to describe any geometry.
The Excel program can also be used as stand alone
without the cad models using print out templates.