1 Overview 2 Details of the Model Construction - Canada France ...

ing everything needed.
• It takes a while to spin the fan up and down, but wind speed changes can be made fairly
quickly. When planning tests, we need to keep this in mind.
• The model can be accessed when the fan is running by feathering the blades to zero wind speed
(e.g. while applying the China clay, so that the fan may be brought to full speed without any
delay.)
• The camera on top of the wind tunnel is not easy to access. Having remote control over one or
both cameras would be beneficial, though not necessary.
• Everything that enters the room must be carried down a flight of stairs.
Appendix 1: The UWAL tuft-making loom
Figure 23 shows the design of the loom used at UWAL for easily making long strips of tufts for
flow visualization. The loom consists of an aluminum channel section, ~6” wide, (shown in grey)
with three or four wooden rails (in yellow), about ~1” apart, and running the length; the length of
the channel is about 3’. The tuft yarn is woven across the channel, going through the opposite
slots in the side members. A long piece of Scotch tape is then used to fix the yarn along the
length of each of the wooden rails. The yarn is then cut on one side only in each of the gaps
between the wooden rails and also the sides of the channel, leaving ~1” lengths of yarn stuck to
the Scotch tape. The tape is peeled off with these tufts stuck to them and fixed where required on
the model.
Figure 23: Design of the UWAL tuft making loom.