Taylorcraft: By / Backfire Medium; Pilot Alternately Revs And Idles With Rising And Falling Whistle. One Dull Backfire In Distance, One Sharp, Isolated Backfire During Idle At Close Range, Engine Steadies With Away. Medium To Distant Perspective. Prop Plane. Sound Effects and Royalty Free Sound Effects for Creative Audio Visual Projects Including YouTube, TV, Film, PowerPoint, Flash, and All Media.