Quote:
Originally Posted by MetroMPG
I'm not clear on how the scale balance is set up. Can you explain it?
I'm guessing there's an actual scale to measure lift (which the student wasn't measuring for this test). For measuring drag force, is there a pivot on the rod holding the model (at the "floor" of the test area), and drag force is measured on the other side of the pivot point?
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The best i can remember (I never used the tunnels) is the center of the model is attached to a vertical rod that is hinged at its base. Then another rod is attached perpendicular to that and creates a lever arm. The lever arm creates a downward force on a scale.
I was hoping these guys may have come up with a better method because as force (wind) is applied to the model the deflection of the lever/scale might tilt the model thus throwing every thing off.
Geoff