1 Solomon I. Khmelnik ORCID: https://orcid.org/0000-0002-1493-6630 solik@netvision.net.il An engine for spacecraft Proposal for patenting application Annotation This proposal is addressed to those individuals and organizations that specialize in the field of space technology and satellites. It briefly describes the idea (and the state of its development), which can be patented. The author is looking partners for joint patenting. Contents Proposal for patenting application Appendix 1. About HVE. Appendix 2. On the electromagnetic momentum. References Proposal for patenting application Recently, there has a patent [1], an experiment by NASA based on this patent [2], and a similar Chinese experiment [3] - see fig. 1. They cause doubts and disputes in the scientific world, since they allegedly violate the law of conservation of momentum. These experiments clearly demonstrate the creation of thrust due to electrodynamic effects. At the same time, they demonstrate that the thrust force is very small. Fig. 1.