[ ] Seven Nacelles (Warp 4.2 Warp 0, 15 -> 43 Industry)
Excuse me, I'm being told by those cowards at Yoyodyne that this "will definitely explode" and is "too crazy even for us". We'll revisit this for the next Stingray refit.
[X] Four Nacelles (Warp 4, 15 -> 31 Industry)
The only mentioned downside is the cost to build. My expectation is that given ship numbers, we're looking at the difference between a Fast DN Fleet consisting of 3 DN, 6 HC and 15 LC, versus a Slow DN Fleet of… 3 DN, 6 HC and 16 LC. I'd rather make sure our strongest, most survivable ship is also the fastest.