Starfleet Design Bureau

On a practical level the two seem about equal, maybe slightly favoring cruise speed. On a political level though, hitting Warp 5 seems like a mandatory requirement.

[X] Racing Configuration (+0.2 Maximum) (Industry 17->21)
 
[X] Racing Configuration (+0.2 Maximum) (Industry 17->21)

This ship is meant to be a symbol - to Humanity, to the Vulcans, to the future UFP. Breaking the Warp 5 barrier is an absolutely massive achievement and an extraordinarily important milestone. Enterprise's job isn't just to be an exploration ship. She's meant to be a harbinger of a better future. So just picking the seemingly more economical option is missing the entire point of this enterprise. We should aim higher.
Its looking real pretty now.

[ x] Racing Configuration (+0.2 Maximum) (Industry 17->21)

i've got faith of the heart
You need to remove the space inside the brackets
[ ] Cruise Configuration (+0.2 Cruise) (Industry 17->21)
You're missing the X.
 
Warp 3 engine cruise is Warp 2.2 or 73% top rated velocity. If that holds true for the Warp 5 engine it'll cruise at Warp 3.65.

Warp 5.2 for 12 hours is 0.19 ly
Warp 3.65 for 12 hours is 0.07 ly
Warp 3.65 for 18 hours is 0.10 ly
Warp 3.65 for 24 hours is 0.13 ly

Warp 4.8 for 12 hours is 0.15 ly
Warp 3.85 for 12 hours is 0.08 ly
Warp 3.85 for 18 hours is 0.12 ly
Warp 3.85 for 24 hours is 0.16 ly

Warp 5 for 12 hours is 0.17 ly

It appears that Warp 5 will be hit regardless of what we do, it's just a matter of time how long it is takes. Sprinting at Warp 5 for 12 hours and then "resting" at the higher (theoretical) cruise speed breaks even if the engines have to rest for 1.5×S where S is the time spent at maximum warp.

However when cruising the higher theoretical cruise is very impactful. 10ly cruising at Warp 3.65 would take 75 days, cruising at Warp 3.85 would take 64 days.

+++
Interesting aside; in ENT it's stated that Qo'noS is only 4 days away at Warp 4.5. Now if that seems absurdly close it's because it is. Using the Kirk warp scale that's only 1ly away, using the Picard warp scale that's only 1.64ly away.

Various sources place Qo'noS 90 to 112ly from earth. Traveling that distance in 4 days would require Warp 20-21 (Kirk Scale) or Warp 9.99 (Picard Scale). Using the Kirk Scale Warp 4.5 a 90 ly trip would take 360 days
 
[X] Racing Configuration (+0.2 Maximum) (Industry 17->21)

Hmm, not sure on this one. I'm leaning towards this on the optics argument for maybe hitting 5 right out of the gate.
 
It appears that Warp 5 will be hit regardless of what we do, it's just a matter of time how long it is takes.

I'm very confused by this. The NX-01, when it leaves spacedock, might not be able to hit Warp 5, that's canon to this quest and we know from the show that it's what happened to the Enterprise. This is an actual problem with the engine design we've done nothing to ameliorate, the only possible divergence from canon is that Yoyodyne might roll better for the warp coils than they did in ENT.

Anyway, I want to go fast.

[X] Racing Configuration (+0.2 Maximum) (Industry 17->21)
 
[X] Racing Configuration (+0.2 Maximum) (Industry 17->21)

She's already gonna cruise faster than anything else we have. Let's give her a good sprint.
 
2150: NX Project (Propulsion)
[X] Cruise Configuration (+0.2 Cruise)

Given how long the ship is expected to be travelling, the cruise configuration seems the most sensible choice despite the attraction of breaking speed records. But for all the ship is capable of faster-than-light, she still remains bound to the dock until her impulse engines are installed. Here the addition of the secondary hull has opened up some options. The original intention was to attach the nacelles to a pair of structural elements jutting from the back of the saucer, but no longer needing them opens up space at the aft of the ship. You could place a pair of impulse thrusters there.

Or, failing that, being able to place the shuttlepod bay at the rear of the secondary hull means that you could actually attach a central engine dead in the middle. Either way the reaction thrusters won't move the kind of mass that you're dealing with effectively, so it has to be the new prototypes. The only question is how much you are willing to let the expenses climb for manoeuvrability at sublight speeds.

[ ] Center Engine (Industry 21 - > 23)
[ ] Twin Engines (Industry 21 -> 25)

 
Since this is gonna be the first explorer ship, it's probably gonna see quite a bit of combat. We should probably go with the twin engines.

[X] Twin Engines (Industry 21 -> 25)
 
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