Did you know that with an RCS of an Eagle’s Eyeball the F-117 Nighthawk was one thousand times less visible than the D-21, the least visible shape previously produced at Lockheed’s Skunk Works?

By Linda Sheffield Miller
Nov 17 2022
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The F-117A Nighthawk shape was one thousand times less visible than the least visible shape previously produced at the Skunk Works.

The F-117A Nighthawk is the world’s first operational aircraft designed to exploit low-observable stealth technology. This precision-strike aircraft penetrates high-threat airspace and uses laser-guided weapons against critical targets.

The F-117A production decision was made in 1978 with a contract awarded to Lockheed Advanced Development Projects, the “Skunk Works,” in Burbank, Calif. The first flight over the Nevada test ranges was on Jun. 18, 1981, only 31 months after the full-scale development decision.

Streamlined management by Aeronautical Systems Center, Wright-Patterson Air Force Base, Ohio, combined breakthrough stealth technology with concurrent development and production to rapidly field the aircraft.

The first F-117A was delivered in 1982, and the last delivery was in the summer of 1990. Air Combat Command’s only F-117A unit, the 4450th Tactical Group, (now the 49th Fighter Wing, Holloman Air Force Base, N.M.), achieved operational capability in October 1983.

The F-117A program demonstrated that stealth aircraft could be conceived, designed and developed, as the following story that appears in Ben Rich’s Book “Skunk Works” proves.

As small as an eagle’s eyeball.

KC-135Q, F-117s and A-7

Rich (who served as the second vice president of Lockheed’s Skunk Works after Kelly Johnson) recalls that time Denys Overholser, engineer and radar specialist for Lockheed’s Skunk Works, spoke to him about the first completely stealthy airframe, the F-117.

“Boss,” he said, handing me the diamond-shaped sketch, “Meet the Hopeless Diamond.”

“How good are your radar-cross-section numbers on this one?” I asked.

“Pretty good.” Denys Overholser grinned impishly. “Ask me, ‘How good?’”

I asked him and he told me. “This shape is one thousand times less visible than the least visible shape previously produced at the Skunk Works.”

“Whoa!” I exclaimed. “Are you telling me that this shape is a thousand times less visible than the D-21 drone?”

“You’ve got it!” Denys exclaimed.

“If we made this shape into a full-size tactical fighter, what would be its equivalent radar signature… as big as what—a Piper Cub, a T-38 trainer… what?”

Denys shook his head vigorously. “Ben, understand, we are talking about a major, major, big-time revolution here. We are talking infinitesimal.”

F-117A print
This print is available in multiple sizes from AircraftProfilePrints.com – CLICK HERE TO GET YOURS. F-117A Nighthawk (Stealth) 49th OG, 8th FS “The Black Sheep Squadron”, HO/88-843, Holoman AFB, NM – 2008

“Well,” I persisted, “what does that mean? On a radar screen it would appear as a… what? As big as a condor, an eagle, an owl, a what?”

“Ben,” he replied with a loud guffaw, “try as big as an eagle’s eyeball.”

The F-117 has been in the news as a newly refurbished airframe is on display at Palm Springs Air Museum in California. Frank Martinez was kind enough to let us share the photo below he took at Palm Beach.

Although officially retired, many F-117s remain airworthy and are used to support limited research and training missions (such as conducting dissimilar air combat training sorties with USAF and US Navy aircraft) missions based on overall cost effectiveness and their ability to offer unique capabilities.

I am sure that Ben Rich is smiling down from heaven knowing that his baby is still active.

Be sure to check out Linda Sheffield Miller (Col Richard (Butch) Sheffield’s daughter, Col. Sheffield was an SR-71 Reconnaissance Systems Officer) Facebook Pages Habubrats and Born into the Wilde Blue Yonder for awesome Blackbird’s photos and stories.

Photo credit: Lockheed Martin and Frank Martinez

Did you know that with an RCS of an Eagle’s Eyeball the F-117 Nighthawk was one thousand times less visible than the D-21, the least visible shape previously produced at Lockheed’s Skunk Works?

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Linda Sheffield Miller

Linda Sheffield Miller

Grew up at Beale Air Force Base, California. I am a Habubrat. Graduated from North Dakota State University. Former Public School Substitute Teacher, (all subjects all grades). Member of the DAR (Daughters of the Revolutionary War). I am interested in History, especially the history of SR-71. Married, Mother of three wonderful daughters and four extremely handsome grandsons. I live near Washington, DC.

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  1. Richard G Paquette says:

    Funny “small as an eagles eyeball”.
    But it would be an eyeball traveling 500 knots.
    And those original air inlets; multipath nightmares.

  2. S125Neva says:


  3. mats13 says:

    The Nighthawk did glorious work in Serbia. To punish the Serbians, who were committing unprovoked genocide against the innocent Bosnians and murdering them by the tens of thousands, America unleashed the F117 upon Belgrade and the Balkan butcher, milosevic.
    In under 24 hours the Nighthawk helped evaporate over 1000 serbian soldiers who functioned as a death squad, murdering women and children.
    God bless the F117, it sent many Serbian child murderers to their graves in hell.

  4. Dragoljub The Evil Serb says:

    Inform yourself better before spilling more nonsense. F117 was downed over Serbia almost as soon as it flew over it. It was detected and downed by the Russian made missile system Neva and its debris is now displayed in the Aviation Museum in Belgrade. “America” never managed to kill more than a handful of Serbian soldiers because your guys were chicken much to come down and fight Serbian soldiers, they only killed thousands of Serbian civilians from above – how heroic is that?

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