Indeed. If the engine had a ring with a diameter of 1 foot, which seems reasonable compared to other rocket engine combustion chambers, a mach 5 detonation shoc

Indeed. If the engine had a ring with a diameter of 1 foot, which seems reasonable compared to other rocket engine combustion chambers, a mach 5 detonation shockwave would circle the combustion chamber at 1.7 kilohertz, which is quite a high-pitched tone (though not as high as the whine of a jet engine).