Wind Tunnel Models

The construction of wind tunnel models has continuously evolved over the last 50 years. Early models were of relatively simple construction with mainly wooden fuselages and steel wings and tailplanes. Only a limited number of surface pressures could be measured due to the technology available at the time for pressure measurements.

Models are now completely manufactured from high grade steels for all stressed components. Advancements in design and machining technology mean that model parts can be made to an accuracy of ±0.025 mm where required. Models for the cryogenic tunnels in particular are manufactured from exotic high tensile steel because of the very high loads generated in these tunnels. ARA undertook a thorough 5 year technology programme to investigate design and manufacture issues for these types of models, including research into materials, fasteners, seal and bonding materials.

Advances in the technology for pressure measurement systems mean that up to 1000 surface pressures (dependent on model size) can now be installed in models with minimal external surface machining. Future developments will include micro-mechanical systems to allow the remote operation of control surfaces such as ailerons, flaps and rudders.