The first Klingon warships powered by
matter/antimatter (M/AM) reactors were the ships of the D3 class, introduced
from 2183. These ships were based on the earlier fusion-powered D2, but had
their "necks" and "shoulders" lengthened to accommodate
the new reactor and to provide additional space for fuel storage. The
similarity of the Klingons' first-generation reactor to early Earth reactors
suggests that Klingon engineers closely studied Earth designs. By the
mid-2170s, M/AM reactors had become standard for merchant vessels within the
UFP, so the Klingons would have had little trouble acquiring and reverse
engineering M/AM reactors.
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