Posted 14 May 2017 - 08:53 PM
That blade is made via resin transfer process (RTM).
The graphite sock is pulled over the internal foams of the blade, then placed into an aluminum mold, where, resin is pumped into one side of the mold to flood the piece and then "cooked" so that the blade will set. The mold itself is tightened so that the blade curve can be accurately created inside the mold.
In the meantime, excess resin is pushed out the other end of the mold.
After being "cooked", the blade is removed from the mold and wet sanded to remove any excess resin from the edges.
Very few blades are still made using this process as pre preg is much more cost effective.