The D4 cruiser, introduced in 2207, was
an important step towards regain the technical lead that the
Klingons had held over the Romulans and Federation in the mid 2150s.
This was the first Klingon
cruiser designed from the keel up to use a matter/antimatter (M/AM)
reactor, previous designs had been modifications of existing
vessels. Unfortunately, the D4 was an overly
ambitious design that ultimately failed, due to problems with unreliable weaponry, unwieldy size, and immature power systems.
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