They aren’t dents, they were put there on purpose for the more advanced ECM systems the SR-71 Blackbird got in the ‘70’s and ‘80’s.
During its career, the SR-71 Blackbird gathered intelligence in some of the world’s most hostile environments.
Throughout its nearly 24-year career, the SR-71 remained the world’s fastest and highest-flying operational aircraft. From 80,000 feet, it could survey 100,000 square miles of Earth’s surface per hour.
The SR-71 was conceived to operate at extreme velocities, altitudes and temperatures: actually, it was the first aircraft constructed with titanium, as the friction caused by air molecules passing over its surface at Mach 2.6 would melt a conventional aluminum frame.
Its engineering was so cutting edge that even the tools to build the SR-71 needed to be designed from scratch.
My Dad and former SR-71 RSO Richard “Butch” Sheffield (Butch was his nickname because of his haircut that he had back in the 60s) he used to point to the nose of the SR-71 Blackbird when we would meet him at the Udvar Air and Space Smithsonian Museum in Virginia. He would point to the dimples and say “This is really important but I can’t talk about it.”
He would smile.
I could just tell he wanted to tell me but he didn’t.
My father and Bob Spencer flew in one of the most important missions in the SR-71 when they got the SA- 5 Missile Signal flying within inches of the Russian border. Getting that signal was very important for the defense of the SR-71.
No one ever shot down an SR-71 they never even got close. Speed and defense made it impossible.
According to former Blackbird pilot Col. Richard H. Graham’s book SR-71 The Complete Illustrated History of THE BLACKBIRD The World’s Highest , Fastest Plane, the nose section allowed the SR-71 to have radar-imaging capability with the advanced synthetic aperture radar system (ASARS), photographic imagery with the optical bar camera (OBC), or a ballast installed. The nose section was held on by faun-massive fasteners.
However, my doubt remained unanswered.
What are those two little dents on the nose of the SR-71 Blackbird?
‘I’m assuming you’re talking about the two “dents” in the chines at the front part of the nose, one on each side? Those aren’t dents, those were put there on purpose for the more advanced ECM systems the Blackbird got in the ‘70’s and ‘80’s,’ says Kelly Pedron, an aviation expert, on Quora.
‘There weren’t any good places to put the ECM receivers in the front of the aircraft, so those “dents” were put in the chine to allow the installation of ECM receivers there. If you’ll notice, the flat part of the “dent” is facing about 60 degrees forward, in order to cover that quadrant of the airspace around the aircraft. Earlier models of the SR, including the A-12, were more concerned with attack radar signals from the rear, so front-mounted ECM receivers weren’t as necessary at the time. With the advent of more advanced Soviet SAM systems, like the S-200 and S-300, a forward warning receiver and jammer were required, hence the development of the so-called ECM “dents” in the nose.’
Pedron concludes;
‘So, yes, those were put there on purpose; nobody accidentally taxied an SR-71 into a solid object.’
Be sure to check out Linda Sheffield Miller (Col Richard (Butch) Sheffield’s daughter, Col. Sheffield was an SR-71 Reconnaissance Systems Officer) Facebook Page Born into the Wilde Blue Yonder for awesome Blackbird’s photos and stories.
Photo credit: Linda Sheffield Miller and U.S. Air Force
Great article, but not quite enough detail for me!
I don’t want to assume, but I would think that these were forward-looking radar, 1 cm to 3 cm wave length, admitting and detecting. The 60° angle would indicate that they might be looking sideways to some degree, and I would think that both Are looking directly forward as well.