Originally Posted by
NutLoose
Composites do not act in the traditional manner that alloy props do. Bending back of aluminium blades indicates rotation and low power, bend forward, suggests power is applied to the prop at impact. Carbon will lose its shape when the epoxy that forms its matrix burns or goes past its melting point. The Hercs R391 props do not show evidence of rotation. CFRP on impact tends to look like a yard broom end, (the business end). The AE2100 is a free turbine engine, so the PCU system feathers the prop on shutdown. These blades appear to be near or at feather.