OUT THE BLUE
Propulsion or speed isn't the answer or way to look at getting to other stars.
1st one needs to understand what space-time is and how it bends or warps.
By changing the fabric of space time or its density between two points,
you don't just change and reduce your mass % by comparison,
you reduce the distance and increase your speed all at the same time.
ANCIENT AIRCRAFT AND SPACESHIPS
Proven evidence that the ancients had superior knowledge of aeronautical
engineering and space flight technology.
In the Vedic literature of India, there are many descriptions of flying machines that are generally called Vimanas. India's national epic, The Mahabharata, is a poem of vast length and complexity. According to Dr. Vyacheslav Zaitsev: "the holy Indian Sages, the Ramayana for one, tell of "Two storied celestial chariots with many windows" "They roar like off into the sky until they appear like comets." The Mahabharata and various Sanskrit books describe at length these chariots, "powered by winged lighting...it was a ship that soared into the air, flying to both the solar and stellar regions."
There is a just a mass of fascinating information about flying machines, even fantastic science fiction weapons, that can be found in translations of the Vedas (scriptures), Indian epics, and other ancient Sanskrit text.
There are no physical remains of ancient Indian aircraft technology but references to ancient flying machines are commonplace in the ancient Indian texts. Several popular ancient epics describe their use in warfare. Depending on one's point of view, either it contains some of the earliest known science fiction, or it records conflict between beings with weapons as powerful and advanced as anything used today.
Above all we need to remember: absence of evidence is not evidence of absence.