Similitude (model)
（重定向自Dynamic similarity）
![A full scale X-43 Wind tunnel test. The test is designed to have dynamic similitude with the real application to ensure valid results.](/Images/godic/202501/10/Wind_tunnel_x-431856.jpg")
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Similitude is a concept applicable to the testing of engineering models. A model is said to have similitude with the real application if the two share geometric similarity, kinematic similarity and dynamic similarity. Similarity and similitude are interchangeable in this context.