B-47 B/N recalls when his Stratojet flew the then largest Nuclear Bomb ever built from UK to Spain

By Linda Sheffield Miller
Jan 30 2026

In this article:

The Stratojet

B-47 B/N recalls when his Stratojet flew the then largest Nuclear Bomb ever built from UK to Spain

The B-47 was the world’s first swept wing bomber and the first to use a bicycle arrangement landing gear, which was necessary because of the thin wings. It was also the first plane built solely for the delivery of nuclear weapons.

A total of 1,260 B-47s were built as bombers and 600 were built as trainers and reconnaissance aircraft. The B-47 first flew on December 17, 1947 and the first B-47A was delivered to the USAF in 1951.

As a result of its capabilities, the B-47 Stratojet became an essential component of the SAC during the 1950s and early 1960s, both as a nuclear bomber and a reconnaissance aircraft.

Since the B-47 did not have the range of SAC’s heavy bombers (the B-36 and later the B-52), Stratojet units regularly deployed to forward air bases around the world on temporary duty, as my father Richard “Butch” Sheffield (former B-47 bombardier/navigator (B/N), former B-58 navigator/bombardier and former SR-71 Reconnaissance Systems Officer (RSO)) recalls in his soon to be unpublished book “Ohio to Supersonic: Flying the SR-71 Blackbird to the secret world of the Skunk Works.”

B-47 flying the largest Nuclear Bomb ever built to Spain

B-47 B/N recalls when his Stratojet flew the then largest Nuclear Bomb ever built from UK to Spain
Richard “Butch” Sheffield is on the far right in the photo. His crew was named Best B-47 crew in 1960

‘In the summer of 1959, our Wing moved its overseas operating location from Fairford, Royal Air Force Base, in the United Kingdom (UK) to a Spanish Air Force Base at Moron, Spain near Seville.

‘In order to get our nuclear weapons to Spain we just flew them in our B-47’s. This way we did not have to down load them from our alert status in the UK. Our primary weapon was the Mark 36. It weighed twenty thousand pounds, completely filled the B-47 bomb bay and had a seven-megaton yield. This was the largest nuclear bomb ever produced.

‘The normal way of moving nuclear weapons was by Military Air Lift. The weapons were safe, off loaded from the bombers, place into heavy lift aircraft like C-130, C-97 or later, C-5’s.

‘So, flying them in the bomber was very unusual. Also, when the B-47 was full of fuel, with tip tanks fully loaded and the Mark 36 loaded our center of gravity (CG) was far aft of normal. We could not land with the bomb onboard and fuel in the tip tanks. We have to burn the fuel out of the tip tanks or drop the bomb to get the CG forward to land.

‘The route to Moron took us right over the Capital City of Spain, Madrid. As I flew over Madrid with this very large Hydrogen bomb, I could help but think, what do those people on the ground think is flying over them today? We even made a simulated bomb run on them.’

B-47 B/N recalls when his Stratojet flew the then largest Nuclear Bomb ever built from UK to Spain
Mark 36 nuclear bomb

Flying home over Bermuda Triangle

‘Dad used to have a perplexed look on his face when he would talk about flying through the Bermuda triangle telling me that there really was something strange about it.

‘When it came time to rotate back home to Little Rock, my CO-pilot, Jim McCracken, and I came up with a way to get home sooner than normal. We would land at the Azores; refuel than were going to fly all the way home on one tank of gas going over Bermuda.

‘Everything was going well, right on fuel plans until we passed Bermuda, than we ran into the jet stream, two hundred-knot head winds, that were not forecast. We were lucky to make it to the East Coast. I have never seen, before or sense, headwinds like that. The jet stream never goes that far South.

‘We landed at Hunter, AFB, SC. on the East Coast. Flew home to Little Rock the next day.’

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

The SR-71 pilot who flew the Blackbird beyond 90,000 feet with no simulator time to prepare him
The book Ohio to Supersonic: Flying the SR-71 Blackbird to the secret world of the Skunk Works by Colonel Richard “E.” Butch Sheffield and Linda Marie Sheffield will be published in February and is available to pre-order here.

Photo credit: U.S. Air Force and Linda Sheffield Miller

Linda Sheffield Miller

Linda Sheffield Miller

Linda Sheffield co-author of Helion’s new book “Ohio to Supersonic: Flying the SR-71 to the Secret World of the Skunk Works,” Linda helped bring her father, SR-71 RSO, Col. Richard “Butch” Sheffield's book to life. Linda grew up on Air Force bases primarily at Beale Air Force Base California. The home of the SR -71. Linda is a graduate of North Dakota State University and taught public school for over a decade as a substitute teacher. Linda writes daily about the SR -71 the A-12 and the U-2 on her various social media accounts. Linda lives in the suburbs of Washington DC with her husband Rodney Miller, they are the parents of three daughters and four grandsons. She is the co-founder of the SR-71 group, Habubrats. Linda has been asked to write articles for the Distinguished Flying Cross magazine, and the Evergreen Museum newsletter. Linda enthusiastically enjoys contributing articles weekly to The Aviation Geek Club.

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