Earthworm said:
Why not? Thro in some material that distrupts radars into armor, give it a stealthy shape and all that other crap. Of course it'd cost a hell of a lot, but to have a large capship that would be imposible to detect at longer ranges would be a great advantage.
A little bit of RAM (radar absorbant material) and a hopeless diamond might be the perfect solution to eliminating detection now, but in the 27th century I'm sure there will be more to stealth than RCS (radar cross section).
Avoiding active sensors might be achievable, but the RAM would have to be absorbant for an extremely broadband of frequencies. Add to that the durability factor. The first singe of laser fire and you have a stealth ship that isn't stealth anymore. After every fire fight the ship took damage in, you'd have to recoat with RAM. Also, it adds an extra challenge to turrets. Their design would have to change, possibly so they fold into the hull of the ship. The scoops will also be a significant challenge, as the air intakes are on the F-117. And, since you are talking about a dreadnough, you have to find solutions that work on a very large scale. That is a big challenge.
Passive sensors are an even bigger problem IMHO. With extremly precise measurements, you could probably detect ships by variances in gravitational forces. You also have the issue of the matter stream accelerating your ship. The most you can do is focus it soo that its not detectable over a large area, unless your stealth ship doesn't plan on accelerating. Even then the electromagnetic radiation will basically be a beacon if the thrusters are line of sight to any enemy detection systems. The scoops on the front probably are a give-a-way too. Of course, since I know nothing about tractor beam technology, I really can't comment, but you are probably talking about some kind of wide spanning EM field that doesn't help the situation in the best case scenerio, and in the worst case tells everyone that might be looking exactly where you are. Then you still have to worry about the visible light from your ship, and the massive field of stars your dreadnought blocks out.
Bottom line is, if a ship is really big, you can disquise it, but you can't make it disappear. If the stealth tech is available and you have the resources to build a low RCS dreadnought, build a dreadnought and a small stealth destroyer with just enough capship missiles to do some serious damage instead. That way, you still have a proven dreadnought and a potential war clinching stealth weapon.