Former Boeing .... There are different types of stealth; radar, IR, sound, and visual. Goal is to reduce enemy's ability to detect you. The RAH-66 Comanche Helicopter was very advanced in its stealth capabilities for the time period during it's development. Both Boeing and Sikorsky have worked together on other projects for military. Radar: Specially angled surfaces and special coatings can help reduce radar being reflected back to enemy. Internal weapons bays hide highly reflective external rockets. When needed, rocket pods are extended to exterior.
IR: Heat can be hidden from direct sensor view or can be mixed with cooler surrounding air to reduce IR signature. The B2 stealth bomber has exhaust hidden from direct view and also mixes cold air in hot exhaust stream. The RAH-66 uses the long tail boom and has hot exhaust flow along it. Also, there is an angled section on tail boom that hides exhaust ports and sections of tail where exhaust flow warms structure. Acoustic: Advanced materials and computational computing created rotor blades many time quieter than standard. Tail rotor was enclosed so noisy tips are muffled. This ducted fan is more efficient than traditional so blades can be smaller and don't need to turn as fast. Visual: There is different camouflage painting schemes to confuse eyes when looking at it depending on what mission helicopter will fly in. Every military branch has their own camouflage depending on forest, desert, urban, etc. Basic flat black is probably best for aircraft. Doppler: Disturbances in air can be detected by certain low frequency radar systems using Doppler. Same systems used to detect tornadoes and severe weather. It was responsible for 1991 F-117 Stealth being shot down during war in Bosnia. This is extremely difficult to disguise. Even 5th generation stealth is vulnerable to it. Maybe 6th or 7th generation stealth will have it disguised. Fun Fact: ET has 'Super Stealth'... their advanced probes use sophisticated AI to pilot themselves. Their probes can't be seen on Radar, IR, or Doppler. Their probes are completely silent. On top of all those stealth features, they are also completely invisible to our eyesight. Their probes can't be photographed or videotaped. They can maneuver in ways that would kill living pilots from G' forces. Only way we would even know they exist is if they turn off stealth. ET has no reason to turn off stealth. So if it can be imaged, tracked, heard, videotaped, or even seen, it's very likely one of our advanced aircraft or drones. Yes, we got really advanced drones being tested. Ours aren't invisible and can be seen. Many sightings of UAP's are our own probes being tested and not ET. When ET wants us to know about them, it will be no mystery.
Former Boeing .... There are different types of stealth; radar, IR, sound, and visual. Goal is to reduce enemy's ability to detect you. The RAH-66 Comanche Helicopter was very advanced in its stealth capabilities for the time period during it's development. Both Boeing and Sikorsky have worked together on other projects for military.
Radar: Specially angled surfaces and special coatings can help reduce radar being reflected back to enemy. Internal weapons bays hide highly reflective external rockets. When needed, rocket pods are extended to exterior.
IR: Heat can be hidden from direct sensor view or can be mixed with cooler surrounding air to reduce IR signature. The B2 stealth bomber has exhaust hidden from direct view and also mixes cold air in hot exhaust stream. The RAH-66 uses the long tail boom and has hot exhaust flow along it. Also, there is an angled section on tail boom that hides exhaust ports and sections of tail where exhaust flow warms structure.
Acoustic: Advanced materials and computational computing created rotor blades many time quieter than standard. Tail rotor was enclosed so noisy tips are muffled. This ducted fan is more efficient than traditional so blades can be smaller and don't need to turn as fast.
Visual: There is different camouflage painting schemes to confuse eyes when looking at it depending on what mission helicopter will fly in. Every military branch has their own camouflage depending on forest, desert, urban, etc. Basic flat black is probably best for aircraft.
Doppler: Disturbances in air can be detected by certain low frequency radar systems using Doppler. Same systems used to detect tornadoes and severe weather. It was responsible for 1991 F-117 Stealth being shot down during war in Bosnia. This is extremely difficult to disguise. Even 5th generation stealth is vulnerable to it. Maybe 6th or 7th generation stealth will have it disguised.
Fun Fact: ET has 'Super Stealth'... their advanced probes use sophisticated AI to pilot themselves. Their probes can't be seen on Radar, IR, or Doppler. Their probes are completely silent. On top of all those stealth features, they are also completely invisible to our eyesight. Their probes can't be photographed or videotaped. They can maneuver in ways that would kill living pilots from G' forces.
Only way we would even know they exist is if they turn off stealth. ET has no reason to turn off stealth. So if it can be imaged, tracked, heard, videotaped, or even seen, it's very likely one of our advanced aircraft or drones. Yes, we got really advanced drones being tested. Ours aren't invisible and can be seen. Many sightings of UAP's are our own probes being tested and not ET. When ET wants us to know about them, it will be no mystery.
Not entirely accurate but sure