The book I read to research this post was Stealth Warplanes by Doug Richardson which is a very good book which I bought from a car boot sale. This book was published in 1989 so is probably a bit out of date but is quite interesting because there is a whole plethora of aircraft incorporating stealth technology including the quite well known F-117A Stealth Fighter. It does have other aircraft like the U2 & Blackbird but a lot of the aircraft I had never heard of and a lot never made it past the prototype stage. Of course the aircraft we know about are mostly out of service or old and the latest technology often referred to as black ops is mostly top secret. Most of the stealth aircraft fly at less than the speed of sound because things like having quiet engines and appearing insignificant on radar wouldn't work. Often they are used over fairly short distances for detailed reconaissance although there are some super quick aircraft where the aim is to out run missiles. An example is the SR-71A Blackbird where for many years the only country that could shoot it down due to their incredible speed and flight altitude was the Soviet Union although there were reports the North Koreans did their best to shoot them down. The Stealth Fighter is composed of a low density carbon composite that doesn't show up on radar. In the Second World War the Japanese Warships painted to resemble smaller less significant ships from a distance and the British painted their Canberra's camouflage green on top and sky grey underneath so the roots of this go back quite a long way. There are aircraft that have the heat from their engine outlets diffused and often have quietened piston engines. There are various decoy measures to fool missiles and another system is to flood the air defences with decoy missiles so genuine ones can get through. Of course yet another measure is spy satellites but to get the right information often requires a closer look and these satellites can often be fooled. If you see this book being sold cheaply secondhand it is worth reading and I did learn quite a bit from it as well as enjoyed it.
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