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Aeropolitics, Other Aviation Issues

How the British Rolls Royce Nene Turbojet Engine Allowed Russia’s MiG-15 (NATO code named ‘Fagot”) to Fight the USAF in the Korean War, and 65+ years later it is still in service with the Korean People’s Army Air Force (KPAAF), whose most formidable offensive aircraft are the +300 AN-2 (Chinese Y-5) low and slow flying fabric biplanes with wooden props that are “stealthy” to US and South Korean radars?

SEE:  https://www.linkedin.com/in/tomas-chlumecky-3200a021/


North Korean, Chinese built F-5 (aka Mig-15)




Tomas’s Comment:

This is a true story about how the British gave the Russians their RR Nene engine, which the Russian reversed engineered and developed their VK-1 turbojet engine which powered their first ‘real’ jet fighter the Mig-15 (aka “engine with a cockpit”), (17, 310 built) with 13,130 built in the USSR and another 4,180 in Czechoslovakia, Poland, and China under license.



The Mig-15’s VK-1 engine exposed (aka “engine with cockpit”)


The aircraft’s Klimov VK-1 engine produced 5,950 lbf, for a thrust to weight ratio of 0.54 and had a rate of climb of 10,000 fpm and a max. peed of M 0.9 (688 mph), range with 2 drop tanks 1,362nm.


The story was that when Rolls Royce and The Russians met in England in 1946 they talked a lot and played a lot of chess, a bet was made that one of the Russians in the group could beat anyone at Rolls Royce, Russians won, though the UK was desperate for money at the time and sold many of the RR Nene  engines between 1946-1947, a stupid thing to do given the tensions between the USSR and the West.


North Korean F-5’s/Mig-15’s still in use-rarely


The Mig-15 is still in use in North Korea (these are the Chinese version from Shenyang designated as the F-5) as a trainer and ground attack? but most of the existing 106 Mig-15’s are just rotting away like the rest of the Korean People’s Army Air Force (KPAAF) aircraft today (97 x F-6/Mig-17, 120 x F7/Mig-21, 80 x H-5/IL-28 bombers, 26 x Mig-21, 56 x Mig-23, 35 x Mig-29, 18 x SU-7, 34 x SU-25).


With little fuel available for flying, the only aircraft that fly regularly are a few Mig-29’s that are still serviceable, as probably +70% of the above aircraft are no longer serviceable, years of ‘cannibalization’ have depleted the inventory from +450 aircraft to +/-120 at best.


I should point out that the KPAAF today still has around 300 x AN-2 “Colt” biplanes, the Chinese version is the Y-5, and while it sounds ridiculous, the US and South Koreans are actually worried about these 65+-year-old fabric covered biplanes, because they are very hard to detect on radar, yes they are stealthy aircraft.


The KPAAF AN-2’s even had a wooden prop to keep metal on the plane to a minimum to lessen radar detection, and their role in time of war is to swarm across the 38th parallel with “special forces” to land behind the US and Korean lines and create chaos in the rear, 300 AN-2’s can drop of over 3,600 “special forces”? seriously?


KPAAF Y-5/AN-2 ‘Colt’ from the 1950’s, feared by US and South Korean Generals?


The Y-5 can carry about 12 troops at a speed of 100 kts, slower than a helicopter, in fact the Russians due to poor planning and neglect of the local Russian market, are re-engining the AN-2’s in Russia with turboprop engines (SibNIA TVS-2MS – Turboprop conversion of An-2 by Siberian Aeronautical Research Institute using the 1,100 shp TPE-331-12UHR) and a metal prop I hope.


A TPE-331-12 powered AN-2 ‘Colt’


When I was in Albania many years ago, I was offered their Chinese built F-5’s and F-7’s for $50,000 in flying condition? (Albania under President Enver Hoxha was Europe’s only Maoist state, and therefore very close to the PRC) just was another place I worked, Guinea under Ahmed Sékou Touré, Africa’s only Maoist state.


While at Air Guinee later on, we did have a single Chinese Xian Y-7 (Chinese copy of AN-24, only 103 were built with the “crap” Dongan WJ5A turboprop engine, now its the MA60 “Modern Ark” with PW127, and about 125 delivered now, and still ‘crap’, but cheap, you get what you pay for.).


Air Guinee’s Xian Y-7 turboprop airliner


Albanian Air Force surplus F5’s and F6’s for sale


When the USSR had no need of the Mig-15 by the late 1960’s, it used the VK-1 turbojet engine as a snow blower or snow melter? sad ending for an engine that revolutionized the jet fighter, see photo below:




How a British Turbojet Allowed Russia’s MiG-15 to Fight the Air Force During the Korean War

Sebastien Roblin  – June 23, 2018 – The National Interest


By the end of World War II, it was becoming clear that the huge fleets of piston-engine propeller planes used in the conflict would soon be superseded by much faster jet aircraft. Nazi Germany and the United Kingdom had deployed jets in combat, and the United States and Japan were close to doing so when the war ended. Only the Soviet Union seemed to lag conspicuously behind.

However, the Red Army captured numerous scientists, research facilities and prototype technologies when it rolled into eastern Germany—including Jumo 004 and BMW 003 turbojets designed for the Nazi’s Me-262 and wooden He-162 jet fighters respectively.

In 1945, the manufacturers Mikoyan-i-Gurevich and Yakovlev were instructed to develop the first Soviet jet fighters using the German engines.

By early 1946 they had developed the Jumo-powered Yak-15 and the faster BMW-powered MiG-9. However, the German turbojets had infamously short service lives and could not generate the necessary thrust, so for their next major jet fighter designs, Soviet engineers suggested acquiring British Rolls-Royce Nene centrifugal-flow compressor turbojets that could produce 5,000 pounds of thrust.

“What fool will sell us his secrets?” Stalin is said to have commented on the idea. But when Soviet designer Viktor Klimov visited the United Kingdom in 1946, the British Labor government proved unexpectedly forthcoming.

London was struggling to repay the United States for military equipment acquired through the Lend-Lease program, and Trade Minister Stafford Cripps appeared not to have grasped the escalating tensions of the Cold War. As a result, the United Kingdom sold dozens of Nenes to Russia in 1946 and 1947 under the condition that they not be used for military purposes.

The Soviets promptly reverse-engineered the Nene for domestic production as the RD-45—and then followed up with the more powerful VK-1, capable of 6,000 pounds of thrust. Ironically, the British would make limited use of the Nene themselves, though U.S. Navy F9F Panther jets did use a license-built version called the J42.

Mikoyan-i-Gurevich developed fighter with a nose-mounted VK-1 turbojet, and wings swept back at a 35-degree angle. Earlier featured in the Me 262, swept wings offer superior performance when approaching the speed of sound (around 600–750 miles per hour) by delaying the formation of shockwaves.

Rolls Royce Nene engine (aka Klimov VK-1)

The resulting MiG-15bis could attain a maximum speed of 678 miles per hour (mph), a hundred mph faster than British Meteor F8 and U.S. F-80 Shooting Star jets, while exhibiting excellent climbing speed and maneuverability.

The Soviets knew they had a winner in the MiG-15, codenamed the ‘Fagot’ by NATO, and went on to produce 12,000 of the speedy jets. Up to 6,000 more would be license-built by in Czechoslovakia, Poland and China.

Soviet-piloted MiG-15s first saw action in support of Chinese Communists in April 1950 when they shot down Chinese Nationalist P-38 Lightning fighter and a B-24 bomber. When North Korea invaded South Korea in June 1950, the former’s substantial force of piston-engine warplanes was swiftly defeated once U.S. fighters intervened.

Then American B-29 Superfortress bombers began blasting cities and military bases along the China–North Korea border in retaliation.

Best known for the atomic bombings of Japan, the B-29 could carry heavy bombloads while tens of thousands of feet high, was relatively fast compared to earlier World War II bombers, and bristled with defensive machine guns.
In October 1950, Chinese and Soviet ground controllers began directing their MiG-15s to bushwhack the UN air raids.

The MiG-15’s excellent climb rate meant that it could attain high altitudes and ambush bombers from above, while moving too fast for the defensive gunners to hit them. Furthermore, the MiGs outperformed U.S. F-80 escort fighters, let alone older piston-engine Corsair and Mustang fighters.

Though the UN pilots managed to shoot down several MiGs with their inferior aircraft, they could not effectively protect the heavy bombers. In April 1951, MiG-15s shot down three B-29s for no loss in April 1951—despite an escort force of a hundred F-80 and F-84 fighters.

The United States discontinued more accurate daylight bombing raids for night operations. Meanwhile, the U.S. Air Force rushed to Korea a few dozen of its only advanced swept-wing fighter—the F-86 Sabre. Over the next three years, Sabers and MiGs in the bare-metal finish would clash in countless air battles over the ‘MiG Alley’ along the Chinese border.

The F-86A and MiG-15bis were closely matched, but the Soviet fighter retained slight edges in climb rate, maneuverability and service ceiling. The Sabre was equipped with six .50 caliber machine guns, while the MiG-15 packed a heavier punch with its twin 23mm cannons with eighty rounds each and single 37mm gun with forty shells. The deadlier Soviet weapons were useful for shooting down large bombers, but had slower (and mismatched) muzzle velocities, making it harder for them to land hits against fast-moving fighters.

Ultimately pilot training and tactics would shape the outcome of the air war more than technical differences. While Saber pilots were mostly World War II veterans, the MiGs over Korea were mostly flown by competent but not as experienced Soviet pilots, with a sprinkling of veterans.

(The participation of Soviet fighter units went unacknowledged by both sides to avoid escalating tensions.) Over time, the Soviets also trained more Chinese and North Korean pilots, who reportedly had to overcome deficits in education and even malnutrition. Chinese and later North Korean MiG units began to account for a larger portion of the sorties starting late in 1951 and suffered heavier losses.

By the end of the war, the U.S. Air Force claimed to have shot down 792 MiG-15s for seventy-eight Sabers lost in air-to-air combat, a 10:1 kill ratio—while the Communists states claimed they had come out ahead with 1,100 U.N. aircraft shot down, including 650 Sabres!

It is probably more informative to compare self-reported losses: the U.S. Air Force reported losing eighty-four F-86 Sabers to all causes over Korea, and a similar number of other types specifically to enemy fighters (and many more to ground fire and accidents). The Soviets recorded the loss of 335 MiG-15s, the Chinese 225, and unofficial North Korean sources allege around 100 losses—but those numbers include accidents.

The MiG-15 was soon evolved into two successors: the highly maneuverable MiG-17, and the supersonic MiG-19, both of which held their own battling U.S. jets during the Vietnam War. Chinese MiG-15s and -17s clashed with Chinese Nationalist F-86s over the Taiwan Strait the rest of the 1950s, and a People’s Liberation Army MiG became the first aircraft shot down by a guided air-to-air missile when it was struck by a heat-seeking Sidewinder.

Though the MiG-15 did not see combat after the 1950s, two-seat MiG-15UTI trainers continued to provide valuable service for many decades—though tragically, famed Soviet cosmonaut Yuri Gagarin perished while flying one in 1968 when his MiG-15 was jarred by a passing Su-15 interceptor.

The Nene turbojet engine gave the Soviet Union a remarkable leg up in the race to design high-performing jet fighters early in the Cold War. Unlike many short-lived episodes of technological one-upmanship, the baffling British blunder would have battlefield consequences in just a few years. While disparities in pilot training and experience resulted in an unequal kill ratio against the F-86 Saber, the threat posed by the MiGs still forced the U.S. Air Force to adapt its tactics and abandon its daylight strategic bombing campaign.

Sébastien Roblin holds a master’s degree in conflict resolution from Georgetown University and served as a university instructor for the Peace Corps in China. He has also worked in education, editing and refugee resettlement in France and the United States. He currently writes on security and military history for War Is Boring.


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