The stratificationinthe moldof structural componentsand bindersis called "Composite".
The structural elementsnormallyare composed ofnatural or synthetic fibers(glass, carbon, polyester, kevlar) withspecialmechanical characteristicsthat normallyare wovento forma mesh.
Several layers oftissuesalsoofdifferentoriginaresuperimposed andimpregnatedwithadhesive resinsthat oncehardenedwill carry theseinposition at the desired shape.
The differentmechanical characteristicsof the tissuescanbeusedto enhancestiffness, elasticity, resistanceto shocksorto abrasion alsoonlyin someareas of the partto be realized.
This type ofconstruction allows to obtainself-supportingshapeswithexceptionalmechanical propertiesthatare notobtainablewithanyother process ofmachining.
The propellersobtainedwiththissystemcanbemade withprofilesand shapes thatcan notbeobteined with common matherials for examplein wood(thin profiles orplantcurved)butevenwithheavier materialssuch as aluminum.
Thedimensional stabilityof the composite(wood propeller is deformedwithtemperature andhumidity) and theresistance to abrasion (the wood is very fragileeven ifpainted), increase the propeller operating lifeandespeciallyoffer constant performances.
The composite props now may be ordered in standard or light version, shape, form and profile are the same.
standard version with a recognized, mythical high impact resistance.
the standard version is repairable in most cases (to be assessed from time to time). It is the best choice in the presence of sand or grass.
The light version is on average lighter by about 30%, is built with a different technology and with a higher percentage of carbon fiber.
The user, however, should know that the impact resistance is lower and in many cases the propeller is not repairable. It is the best choice for compettion use.