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you could use a spring behind your object, and calculate inline reaction force from deflection.

it will be essential the wind speed is accurately measured

force will represent wind velocity squared *drag coefficient , once calculated the drag coefficient can be used elsewhere, in acceleration calculations for instance.

measuring forces versus wind speed should produce a exponential graph in the form f = v^2 as drag force is proportional to square of velocity

if you translate the action into freefall , at terminal velocity the forces balance,

down = mass * gravity acceleration ( newtons)

up = velocity ^2 * drag coefficient (newtons)

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Q: How do you measure aerodynamic forces in a homemade wind tunnel?
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