Narvik University in Norway run a wind tunnel as part of their aerodynamics department.
The fan became damaged during one experiment, doing terminal damage to all the blades.
The university needed an exact copy to replace the damaged fan, so they sent it to us to reproduce.
The blade profiles were recreated using our Coordinate Measuring Machine (CMM), then a 3D CAD model created. From there the first challenge was to build the laminated four blade blank, using the traditional method of alternating solid and split layers to create a consistently strong blank.
The blank was then machined using our CNC, one blade at a time, prior to having the hub hand crafted and the hub shroud created using the traditional plywood method.
Once complete the fan and nose-bowl (which also needed some repair for dents it had received during the incident) were painted using a colour matched paint.