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The wing span (WS) of the EJR-145 = 20.04 m (65 ft 9 in)
Find scale like this: X = real WS/model WS
The trick is (real WS) and (model WS) must be in the same units: inches, etc.
Then scale = 1/X.
If you do not understand, measure and post the model wingspan (with units) and I will calculate the scale for you.
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