The D6 cruiser, which entered service in 2241, was a radical
change from the previous class (the D5) both internally and externally.
The ship's systems were designed with high levels of
performance emphasised over long-term reliability. To reduce
weight, the only warp reactor carried was a compact M/AM reactor of completely Klingon design that could sustain output
at near-maximal levels for approximately 150 hours without shutdown,
and also began the Klingon trend of using very little shielding as a
consequence. The relatively large nacelles were able to handle extremely high
levels of power and achieve maximum speeds for days at a
time. However, their warp coils had to be replaced after cruising at warp 6 for less than 30 days.
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