Explain to me how the F-22 is more "stealthy" then the F-117?
The F-22 has a radar, it's engines go supersonic which mean it creates more heat... compared to the F-117 which doesn't have a radar and it's engines doesn't go supersonic which mean way less heat than the F-22.. and also add in the overall shape of the the two aircrafts
Lets start with the radar.
The F-22's uses the AN/APG-77 radar, an active-element, electronically scanned (that is, it does not move) array of over 1000 finger-sized transmitter / receiver modules. Each module weights ca 15g and has a power output of over 4W. The APG-77 is capable of changing the direction, power and shape of the radar beam very rapidly (called random frequency hopping), which is practically impossible for current RWR to pick up. The AN/APG-77 changes frequencies more than 1,000 times per second to reduce the chance of being intercepted. The radar can also focus its emissions to overload enemy sensors, giving the plane an electronic-attack capability. The result, an enemy will not know that the F-22 has a firing solution until the active radar of an AMRAAM lights up five miles away.
Stealth aspects
Airframe features
The F-117 is a prime example of scattering. The entire plane is one, large system of triangles. It has all flat surfaces, angled to deflect radar waves away from enemy base. The F-22 also does this, but in a different manner. It is fairly rounded, yet on closer observation, the over-all shape has angles to it that scrambles the radar all over, everywhere but back to the radar's origin.
The F-22 has a low height triangle appearance from the front. This physical cross sectional view ensures a small signature from the front and low observability touches such as paint and materials, as well as little "W" shapes where straight lines might have appeared, all tend to break up the signature by absorption or redirection.
The "W" shapes are found at numerous places on the stealth aircraft. For instance, in the forefront of the cockpit glass, there is a very apparent "W" shape. This reduces the radar energy reflected during a head-on pass to the radar emitter. The "W" shape is also found on landing gear doors, engine inlets and outlets, as well as other openings.
The leading and trailing edges of the wing and tail have identical sweep angles (a design technique called platform alignment). The fuselage and canopy have sloping sides. The vertical tails are canted. The engine face is deeply hidden by a serpentine inlet duct and weapons are carried internally.
Engine nozzles
Reduction of radar cross section of nozzles Is also very important, and is complicated by high material temperatures. The approach taken at Lockheed is to use ceramic materials. The ceramics may be either lightweight, parasitic sheets mounted on conventional nozzle structures or heavier structural materials forming saw-toothed edges.
Cockpit
The pilot's head, complete with helmet, is a major source of radar return. This effect is amplified by the returns of internal bulkheads and frame members. The solution is to design the cockpit so that its external shape conforms to good low radar cross section design rules, and then plate the glass with a film similar to that used for temperature control in commercial buildings. Here, the requirements are more stringent: it should pass at least 85% of the visible energy and reflect essentially all of the radar energy. At the same time, one would prefer not to have noticeable instrument-panel reflection during night flying.
Antennas
On-board antennas and radar systems are a major potential source of high radar visibility for two reasons. One is that it is obviously difficult to hide something that is designed to transmit with very high efficiency, so the so-called in-band radar cross section is liable to be significant. The other is that even if this problem is solved satisfactorily, the energy emitted by these systems can normally be readily detected. The work being done to reduce these signatures is classified.
Paint scheme
In order to make the F-22 disappear for the human eye on the ground, when in flight, special camouflage schemes have been developed. This way the plane will blend with the background sky as much as possible viewed from the bottom and disappear in the ground texture when seen from above."
Engines
The F119 can push the F-22 to supersonic speeds above Mach 1.4 even without the use of afterburner, which gives the fighter a greater operating range and allows for stealthier flight operation. No after burner = not a big IR signature at super sonic speeds.
