Norman Macmillan's full-power vertical tests took the Flycatcher close to its estimated terminal velocity, beyond the range of contemporary airspeed indicators. At those speeds the one-piece Fairey-Reed propeller's tips approached or could reach supersonic speed. Rising drag caused tip flutter, while shock waves and the Jaguar engine's unsilenced exhaust added to the noise. Rapid changes in blade angle during pullout introduced another source of vibration and sound. Fleet Air Arm convergent dive-bombing displays therefore advertised both a tactical technique and the severe aerodynamic loads encountered during a dive.
Notable Point · 46:40-48:18
Why a full-power Flycatcher dive produced a distinctive roar
High-speed dives pushed the Flycatcher's propeller tips toward supersonic speed, adding shock waves and flutter to the Jaguar engine's noise.