Technical Guide to the UTAD-2 Wind Tunnel

6. Requirements to Models

6.1 Model Mounting on Three Component Balance ABMK(t)

ABMK(t) balance has constant lateral support base equal to 450 mm, and longitudinal base can be continuously varied in 300...450 mm range. Joints for model mounting are performed according to recommendations of Aerodynamic Center staff (aerodyn@nau.edu.ua).

6.2 Model Strength

The model, installed on the joints, is to withstand overload 5 (five) times greater than expected in wind tunnel run. Loads have to be distributed by model surface according to that in real airflow. Models, developed and manufactured by the customer, undergo strength test without exception in presence of Aerodynamic Research Center representative and the appropriate certificate is executed.

6.3 Additional Requirements and Recommendations

1. The model must be supplied with log, where all necessary data are designated.
2. The model must be supplied with the reference block (Fig. 6.1), which can be mounted on the wing or other reference surface in a uniform way and fixed tightly. Upper block surface must be flat (within 0.01 mm) and must be not less than 205 by 75 mm. This surface serves for optical inclinometer mounting. Flat surface must be parallel to the reference model line or have a known angle with it, which is indicated in model log. Exception can be done for axisymmetrical objects, which have cylindrical portion 250 mm or longer and cylinder axis is the reference axis of an object. Another exception is possible if flat surface that satisfies requirements mentioned is a part of a model itself.

Figure 6.1 A Sketch of Reference Block for Optical Inclinometer Mounting