Wind-pellet shear sailing to reach 5-20% light-speed for interstellar travel(youtube.com)
youtube.com
Wind-pellet shear sailing to reach 5-20% light-speed for interstellar travel
https://www.youtube.com/watch?v=M85Dc3lQBwI
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Plasma magnets can be used to accelerate a spacecraft up to 2% speed of light by dynamic soaring.
This next idea is to combine dynamic soaring with nuclear fusion pellets to reach up to 20% light speed. I believe it's the only engine (except for antimatter) that could feasibly be used for human interstellar travel.