Several Issues With Leakage
Pilot Chuck Yeager was flying a Bell X-1 research plane when he broke the sound barrier in 1947. Other air forces throughout the world naturally desired to emulate the accomplishment, so they built their own fast research planes. It had the expected results: people produced them too quickly, and they didn’t have the same outcomes as Yeager.
The Bristol 188 was Britain’s answer to the Bell X-1, but it had glaring problems in its design…
When it was in flight, it had a leaky engine. Even though the plane was supposed to go Mach 2.6, it only made it to Mach 2.