Sounds in flight

When a bird flies past at close quarters, a word often springs into my mind to describe the sound of its wings. The fluffy purr of a sparrow's wings; the clap of a pigeon's (a flock flying over sound like an appreciative audience at a concert); the whirr of a wren. Though when a peregrine falcon flew right past my left ear to grab a bluetit from the bird feeder at my sister's house in Cumbria, I heard nothing as its swoop was completely silent. Even the poor bluetit didn't hear or see what was coming.