PLEASE NOTE I AM ALSO INCLUDING TWO UNSIGNED PHOTOGRAPHS OF DR. PYOTR UFIMTSEY FOR FREE. This auction is for the following Pyotr Yakovievich (Deceased) RARE autographed 4x6 photograph that has been JSA COA authenticated. This Pyotr Yakovievich (Deceased) autographed 4x6 photograph has been authenticated by the most prestigious and respected authentication company in the hobby JSA #AY26597. Autographed items that have been authenticated by JSA adds and additional value to all signed items that bare the JSA authentication process.

BIO: Dr. Pyotr Ufimtsev considered to be the “Father of Stealth Bomber” is a Russian physicist and mathematician, considered the seminal force behind the creation of modern F-117 and B-2 Stealth aircraft technology. In the 1960s he began developing equations for predicting the reflection of electromagnetic waves from simple two-dimensional shapes. In the 1970s American Lockheed engineers began to expand upon some of his theories to create the concept of aircraft with reduced radar signatures. In the 1960s he began developing equations for predicting the reflection of electromagnetic waves from simple two-dimensional and three-dimensional objects.

The Father of Stealth:

While working in Moscow, Ufimtsev became interested in describing the reflection of electromagnetic waves. He gained permission to publish his research results internationally because they were considered to be of no significant military or economic value. A stealth engineer at Lockheed, Denys Overholser, had read the publication and realized that Ufimtsev had created the mathematical theory and tools to do finite element analysis of radar reflection. This discovery inspired and had a role in the design of the first true stealth aircraft, the Lockheed F-117. Northrop also used Ufimtsev's work to program super computers to predict the radar reflection of the B-2 bomber.

In the 1960s Ufimtsev began developing a high-frequency asymptotic theory for predicting the scattering of electromagnetic waves from two-dimensional and three-dimensional objects. Among such objects were the finite bodies of revolution (disk, finite cylinder with flat bases, finite cone, finite paraboloid, spherical segment, finite thin wire). This theory is now known as the Physical Theory of Diffraction (PTD). The first results of Physical Theory of Diffraction were collected in the book: P. Ya. Ufimtsev, Method of Edge Waves in the Physical Theory of Diffraction, Soviet Radio, Moscow, 1962. In 1971 this book was translated into English with the same title by U.S. Air Force, Foreign Technology Division (National Air and Space Intelligence Center), Wright-Patterson AFB, OH, 1971. Technical Report AD 733203, Defense Technical Information Center of USA, Alexandria VA. This theory played a critical role in the design of American stealth aircraft such as the F-117 and B-2.

THIS IS AN AUTHENTIC HAND AUTOGRAPHED 4x6 PHOTOGRAPH. I ONLY SELL AUTHENTIC HAND AUTOGRAPHED MEMORABILIA. PLEASE NOTE this 4x6 photograph was printed in the early 2000’s and then personally hand autographed. I do not sell reprints or facsimile autographs. When you bid on my items you will receive the real deal authentic hand autographed items. You will receive the same signed photograph that is pictured in the scan. If you have any questions feel free to e-mail me. I currently have other rare autographed military and historical signed items available. Please take a look at my other auctions of rare military and historical autographed items.