From Alpine foils:
To do this, we first chose to shape a fuselage aluminum machined in the mass , because this process allows to take advantage of all the properties of the material. The machined aluminum is perfectly homogeneous, its mechanical performances are intact and it offers the possibility to model an incredibly fine fuselage. Therefore, we meticulously calculated the stresses on the windfoil fuselage so that the ratio between rigidity and fineness is optimal: each existing zone must be perfectly useful. The result is an ultra-stiff, ultra-thin product that provides the ultimate glide feel , as well as exceptional lightness .
Fuselage section 425px
This fineness is achieved in particular thanks to the FRDS technology (Fuselage with Reduced Drag System). This system developed and developed by AlpineFoil consists of modeling a fuselage with a leading edge at the bottom and a trailing edge at the top so as to guide the flow along the profile. Thanks to the FRDS, the flow is perfectly laminar , the drag is clearly reduced and the glide is extremely fluid .
Read more at
https://www.alpinefoil.com/pages-hydrof ... ShTbtWU.99