Originally posted by Kosh
The new designs are pretty close. They have stealth technology so you can't use radar (and IR if it happens to be one of the stealth bombers, not sure about the fighters), and they are painted black so they are almost impossible to spot visually at night. Those add up to something pretty close to invincibility unless someone figures out how to crack stealth tech.
Radar will detect stealth aircraft. All stealth technology does is
reduce the radar signature, not eliminate it. Although the B-2 is close...
The thing is, stealth bombers are stealthy because most radar systems combine transmitter and receiver in one unit, or at least very close together. To be stealthy, the aircraft design only needs to ensure that radar energy is never (or rarely) reflected back in the direction it came from.
In photos, the B-2 always seems like a black cut-out stuck onto the picture. It doesn't have many surfaces that reflect light. That's a side effect of the stealth design.
If multiple receivers are synchronised with the radar transmitter, there's a very good chance that one of the receivers will be in the path of a reflected lobe of energy. Alternatively, you could synchronise a single receiver with multiple transmitters blanketing the area.
Using the mobile phone network of a country as a transmitter, detecting a stealth aircraft could prove to be a very easy task.
IIRC, the B-2 takes it a step further. The aircraft's skin can ionise the air around it to actually absorb substantial amounts of radar energy, reducing the plane's signature another 60-80%. America's not the only country with that technology though; the Russians have been working on a similar system for the past ten years (officially, that is).
The only problem is, the ionised air prevents radio transmission too. To use their own radar, the crew must temporarily disable their cloaking device.
That's another vulnerability stealth bombers have: their attack and navigation radars. The B-2 is so heavily computerised that it can usually navigate with reasonable accuracy without radar, but all aircraft have to light up their radars at some point over hostile territory.
Originally posted by Nuke
this might make them want to keep the a-10 around. replace the gau-8 with a laser. but we all know what weapon is cooler
For many decades to come, mass weapons will be more powerful for their size and weight than lasers. A laser may be capable of shooting down an aircraft, but a tank is tougher by at least an order of magnitude (unless the aircraft being compared is an Mi-24 attack helicopter).
So the A-10's huge 30mm chaingun probably won't be worth replacing with a laser until that aircraft is too obsolete to be considered for such an upgrade.
And yeah, that chaingun is cooler anyway.
Re: the Su-47.

Niiiiiiiiiiiiice...