Investigations show that a time-varying $\delta -{\delta }^{\prime }$ mirror gives rise to asymmetrical vacuum radiation on its two sides, enabling one to gain propelling force from the quantum vacuum excitation. In this work, we propose a design of a Casimir device to gain propelling force by exciting a vacuum asymmetrically with conventional $\delta$ mirrors. This device is experimentally feasible. It consists of a cavity made up of two mirrors, a perfectly reflective one on the left and another one with time dependent transparency on the right. All particles generated from the vacuum are ultimately right moving, so the cavity obtains a left-pointing propelling force.

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• Casimir effect