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Season 1:
Worf raises "shields and deflectors" in "Encounter at Farpoint," with
Tasha doing likewise in the same situation in "Hide and Q."
The deflectors can survive atmosphere at high speed for a while; the
hull beneath can be heated to 3300 degrees just fine in "Arsenal of
Freedom," while comparably a freighter's hull reached the same
temperature before disintegrating in "Symbiote." The material of a GCS
hull is tritanium ("Where Silence Has Lease"), which is, even in small
chunks, too tough for UFP hand weapons to melt.
The Enterprise is also seen studying a flaring unstable yellow star at
point blank, which the deflectors are mostly able to cope with. Also can
survive a direct full-tubes whack at point blank by a Constellation
class. Can deflect solar flares, but it is not recommended that a
ship go unshielded through them.
Season 3: Shields may be extended 5 kilometers from the ship in "The
Defector."
Season 4: "Brothers" - the Enterprise can generate force fields in its
interior.
Navigational Deflectors. As seen in "Outrageous Okona," the
navigational deflector functions as a shield of sorts when the ship is
stationary. As noted in "Best of Both Worlds," the deflector handles
enormous quantities of power. As seen in "The Battle," it moves
interstellar hydrogen, dust, gas, etc out of the way while the ship
passes, with very little lead time. The precise mechanism of operation
is not entirely clear.
Season 5: "The Next Phase" introduces the phase cloak - a device that
makes ships completely invulnerable to fire by passing them out of
phase. Romulans have been experimenting with it. A variant of this
technology is also seen in "Time's Arrow," and the fully functional
Federation model of the phase cloak is then seen in "The Pegasus." "New
Ground" - deflectors are down 15% after collision with a high energy
subspace wave. This suggests an absolute upper limit of 300-8,000,000
yottajoules for the energy normal strength deflectors can take.
Season 6: "A Fistful of Datas" - a 15 second personal force field can
be improvised from and powered by a communicator with a few spare
primitive electric components, stopping 6 bullets from a handgun. In
"Chain of Command," we see a portable purpose-built deflector emitter, a
device roughly the size of a tennis ball.
"Hero Worship" - full shields of a GCS use the output of no more than
half its fusion reactors and equal to six.
"Relics" - shields at 23% during increasing solar flares (threatening
to engulf the ship) will produce shield failure in three hours.
"Suspicions" - new metaphasic shields allow a shuttle to survive
immersion in a star.
"Descent" - 10,000 rads of radiation and hull heating to 12,000C come
before shields decline to 61%. The Enterprise may adapt its shielding
to metaphasic easily. The Borg vessel in "Descent" was destroyed by an
artificially induced solar flare.
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