In April 1964, a stubby little aircraft with rotating engine pods on its wingtips lifted vertically off a runway at Manching, West Germany, tilted its engines forward, and accelerated through Mach 1 in level flight. The EWR VJ 101C — built by Entwicklungsring Süd, a consortium of Bölkow, Heinkel, and Messerschmitt — became the first VTOL aircraft to exceed the speed of sound. Then the program was cancelled. The prototype sits in a Munich museum. Nobody built a supersonic VTOL fighter that actually worked for another 40 years.

The specification came from the 1957 NATO Basic Military Requirement 3 (NBMR-3), which anticipated that Warsaw Pact strikes would crater every runway in West Germany within hours of war breaking out. Fighters had to launch from forest clearings, autobahn stretches, and dispersed sites. Bölkow's chief designer Ludwig Bölkow and his team settled on a radical architecture: six Rolls-Royce RB.145 turbojets, four in tilting wingtip nacelles (two per side) and two mounted vertically in the fuselage for lift augmentation. Total thrust-to-weight ratio: 1.24. The tilting-nacelle concept let the same engines provide vertical lift, transition thrust, and horizontal cruise — no dead weight lugged around like the RB.162 lift jets that would later doom the Mirage IIIV.

The VJ 101C X-1 first hovered on 10 April 1963. Full transition to horizontal flight followed on 20 September 1963. On 29 July 1964, it exceeded Mach 1 in level flight without afterburners. The improved X-2, fitted with afterburning RB.145R engines, hit Mach 1.04 in July 1965. The aircraft flew 325 test flights across both prototypes. Only the X-1 was lost, on 14 September 1964, due to a gyro failure during a conventional takeoff — the pilot ejected safely. The X-2 flew until 1968.

What killed it? Three things converged. First, NATO abandoned NBMR-3 in favor of standardizing on the F-104G Starfighter, which Lockheed had aggressively sold to Germany through means later exposed in the 1975 Lockheed bribery scandals. Second, the follow-on VJ 101D — a Mach 2 operational fighter with a proper fuselage lift system — needed engines Germany couldn't fund alone, and the UK pulled out to pursue the P.1154. Third, the Luftwaffe brass concluded that dispersed operations were a tactical fantasy: you couldn't hide fuel trucks, munitions, and maintenance crews in a forest.

Here's why it matters now. The VJ 101's tilting-nacelle architecture is exactly what Bell and Boeing struggled with on the V-22, and exactly what the F-35B avoids by using a mechanically brutal lift fan driven by a driveshaft from the main engine. Modern FADEC engine control could eliminate the analog thrust-balancing gymnastics that made the VJ 101 a handful. Composite structures would fix the weight problem that limited its payload. And the strategic case has returned with a vengeance: China's DF-17 and Russia's Iskander make fixed airbases in the Western Pacific and Eastern Europe just as vulnerable as NATO planners feared in 1957. The USAF's Agile Combat Employment doctrine is NBMR-3 rediscovered. The concept wasn't wrong — the engines were just 60 years too weak.