Posted on 05/07/2026 10:21:06 AM PDT by SunkenCiv
The B-52 may fly forever, but its 1960s-era engines certainly won't, and that's why it's such a big deal that the mighty BUFF is finally getting all-new and much more efficient turbofan engines.
The B-52's engine upgrade is a VERY BIG DEAL | 5:37
Sandboxx | 531K subscribers | 125,659 views | May 5, 2026
(Excerpt) Read more at youtube.com ...
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YouTube transcript reformatted at textformatter.ai *may* follow.
Transcript
B-52 Upgrade Overview
Well, the B-52 might just fly forever, but its 1960s era engine certainly won’t. And that’s why it’s such a big deal that the Mighty Buff is finally getting all new and much more efficient turboan engines. Now, the B-52 Stratafortress has been a staple of American air power since 1955, with the last new B-52 airframe delivered to the Air Force like 64 years ago now. But despite its advancing age, this heavy payload strategic bomber keeps finding new uses for the Air Force. In fact, the B-52 is now expected to stay in service for the foreseeable future, while new bombers built to replace it, like the B1B Lancer, aren’t expected to see the end of the 2030s.
So, how has the B-52 managed to stay airborne for so long when much newer aircraft like the A10 are considered too outdated for the modern fight? Well, it really comes down to a combination of the B-52’s design intentions and the role it ultimately found itself filling for the Air Force. The B-52 was overengineered right from the start, partially because it was being fielded amid a rapid technological transition from prop driven to jet powered aircraft, but also because the bomber was always meant to be capable of delivering nuclear weapons. Now, that means the B-52 needed to be able to fly great distances with massive payloads, with plenty of space to add upgrades down the road while still being tough enough to withstand air-to-air combat back when even the B-52 came equipped with a tail gunner.
As the years pressed on, all that extra space for upgrades came in really handy, and the B-52 became America’s premier missile truck and honestly, a lot more with its external pylons. Originally rated to carry huge 5,000 lb munitions and later upgrades aiming to increase that to nearly 20,000, B-52s have become priceless air launch test platforms, deploying everything from the Mach 6.7 rocket powered and manned X-15 back in 1959 to the Air Force’s latest AGM 183 Arrow hypersonic missile in testing just last year. And like the B-52’s missile truck role, these jobs don’t require aggressive wing bending flying to be accomplished. And that is important because it’s played a huge role in the B-52’s longevity.
Newer bombers like the B1B Lancer were designed for low-level penetration flying, flying nap of the earth and maneuvering around the terrain. In comparison, B-52s fly a lot more like commercial airliners, engaging targets from so far away that the massive buff doesn’t even show up on radar. But believe it or not, the B-52 is still flying with the same eight practically ancient Pratt & Whitney TF33 turbo fan engines that it started out with, each of which produces around 17,000 lbs of thrust and the B-52’s classic smoke trails. Now, despite limited upgrades over the years, these engines are just way too old to keep in service. In fact, they’ve been out of production for as many years as I’ve been alive. And you won’t be surprised to hear that engine technology has actually matured a lot since then.
So, now the B-52 will receive eight new Rolls-Royce F-130 turboan engines derived from their much more efficient BR725 commercial engine. Now, these new power plants will produce that same 17,000 lbs of thrust, but while offering much more range, more loiter time, and a huge drop in maintenance requirements. Now, we can’t say exactly how much more range the B-52 will get from these engines. Estimates currently span from as little as 10% to as much as 30%. But we can speak to how this range extension is being accomplished.
You see, the B-52’s current engines were derived from earlier turbo jets, and they have an extremely low bypass ratio, or the amount of air that passes around the engine core versus the amount that’s compressed, mixed with fuel, and ignited within it. Now, low bypass engines are, broadly speaking, a lot less efficient, but a lot better at producing power. That’s why modern fighter engines also have very low bypass ratios today. And back in the 50s, that was just about the only way to get enough power onto this bomber to make it fly. So, while today’s B-52 engines have a bypass ratio of only around 1.2:1, its new F-130s have a bypass ratio of 4.2:1, meaning the engines effectively move a lot more air with a lot less work, making them way more efficient in how they burn fuel without any compromise in speed or payload capacity. And that’s actually just the beginning of this B-52 upgrade. So, let me know if you want to hear more.
Hey, hey, hey, hey.
Big Ugly Fat Fellow
The most interesting part of the Iran war has been the use of weapons platforms that are extremely new cutting edge, weapons that have been around for 10 years, 20 years, 30 years, 40 years and 50 years or older.
The B-52 has 8 J 56 Prat & Whitney engines. That’s more to go wrong but with that many engines it can still fly if up to four are lost, with no pay load of course.
An acquaintance (we hung out at the same place) had been a mechanic on a base with B-52s. He called the engines “pigs” and complained about the amount of service and pm they required. But there’s nothin’ quite like ‘em.
I first read about plans to replace the engines back in the same time frame (late 1990s). At that time there was a saying among the flight crews — ‘when the last B-52 is flown off to be mothballed, the crew will return to base aboard a B-52.’ Kinda zen. The plane will probably begin a second century of service, assuming no one figures out next-level physics propulsion systems.
If it ain’t broke... use it to blow the b******s to bits. Then grab a sandwich.
Aviation Ping!.................
Earlier times had many B-52s parked and on alert ready to go so some savings in flight hours were accrued. Still a magnificently engineered aircraft!!
Could have sworn an engne upgrade was being done a long time ago?
God saved me as I was selected to go into Nuke Weapons instead...(no Vietnam for me!)
March AFM early ‘70’s
I was there.
It has been talked about for decades, they are finally getting around to it.
My plan was to replace the two inboard engines with a large modern single engine each, and to replace the outboard pairs with new smaller pairs. Some loss in servicing efficiency offset by more, and more efficient power.
Nope, just talked about, repeatedly. There used to be piles of ‘em in mothballs, sez here that number has fallen to 12. With these new engines and avionics, 12 more B-52s could add about 15% to operational numbers.
I believe it has been a sort of on-again, off-again, thing that's finally happening. Accounts I have watched/read say the new Rolls-Royce engines are better in every respect ... as they bloody well should be.
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