Tachyons

"The Pirate."

A spaceship in the normal mode can be tracked by:

amplified sight;

thermal radiation;

radar;

neutrinos from its powerplant.

- on the tachyon mode by:

"...a weak emission of super-light particles..." (p. 219)

When Trevelyan Micah and Smokesmith in the Genji followed Murdoch Juan and his crew in their Campesino, Murdoch's crew detected the Genji's tachyons while faster-than-light and her neutrinos while slower-than-light.

Tachyons are faster-than-light particles. (Theoretical, as yet.) When in the tachyon mode, a spaceship emits super-light particles/tachyons. But what is the "tachyon mode"? Are the ship and its contents transformed into tachyons? Or, at least, are they endowed with whatever property of tachyons makes them move faster than light?

Have there been two hyperdrives in the Psychotechnic History, the first involving multiple dimensions and discontinuous psi functions, as in "Gypsy," and the second involving tachyons, as in "The Pirate"?

Who can possibly say?