Blackhole Engines, again.

Anybody remember last year's thread on using a micro-blackhole to power an
engine (essentially making use of Hawking radiation to use it as a
mass-energy converter)?

I've been thinking about the idea some more.

Let's say you've got two micro-blackholes, massing a total of 9560 tonnes
(why that mass? because I felt like it).
Normally, they'd decay in about 9180 seconds, but orbiting them around each
other gives you the benefit of time dilation. Say that you orbit them
separated by five times their diameters (just to give a large safety
margin), the combined time dilation effects of their orbital speed and being
in each other's gravity wells slows that a little bit to 10200 seconds (~2.8
hours), more if they orbit closer, less if they orbit farther (at the
closest possible orbit, just before they merge, time-speed is about halved,
assuming that the time dilation effects should be multiplied rather than
added [?]).

Assuming I haven't made any calculation errors, the power rate is about
3.11976e19 Watts, and the fuel injectors have to be able to supply
~937.25kg/s just to keep the holes from decaying, plus reaction mass. Not
too challenging, I think. The mass flow, that is- controlling that much
wattage will be difficult.

In order to confine the holes, we put a small charge on them, so that we can
manipulate them with an external magnetic field. They'll try to eliminate
excess charge as they decay, but that can be solved by giving a slight
charge to the mass being fed into them, such that an equilibrium is reached
between emitting and absorbing particles of a certain charge. With both
holes having the same charge, they'll repel each other, countering their
gravitational attraction, slowing orbital speed, and reducing time dilation
effects, but that ought to be easily countered by the external magnetic
field. The holes will also be constantly emitting angular momentum in the
form of synchrotron and gravitational radiation, but that ought to be easily
made up for by inducing a slight rotation in the infalling fuel-matter. The
engine can be throttled by varying the rotation rate of the fuel-matter
and/or by varying the strength of the confining magnetic field (stronger
field, faster orbits, lower power).

The rapidly orbiting blackhole pair, and the rapidly-rotating plasma
surrounding it, will generate a massive magnetic field of its own.
Preferential evaporation was a major question in the last thread IIRC
(mainly in terms of how to get everything being emitted to back in during
'idling', when there's no fuel-flow to keep the holes from evaporating), and
while that won't have any significant effect on the high-energy photons or
neutral particles being emitted, but it will cause preferential emission of
charged particles along the axis of rotation (the others being caught by the
magnetic field and accelerated back into the blackholes), and will direct
fuel-matter along the axis of rotation. Coupled with an external field, it
could serve as the beginning of a magnetic nozzle. If we surround the
blackhole chamber with a loop of wire in the same plan as the orbiting
holes, a current will be induced in it whenever the magnetic field changes,
indicating the holes getting closer together or father apart, so that and a
Hall probe to detect absolute field strength could be used to keep track of
how far apart the holes are and how they're moving in order to fine-tune the
throttling equipment.

And my flow of ideas has dried up for now, so I leave the discussion to you
all....

-l.
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