Stearman: Electric Start / Idle / Throttle; Stearman Xa-21. Pilot�s Perspective: Engine Grinds And Starts, Idles Steadily With Low, Smooth Timbre. Idles At Various Speeds. Revs Up At End With Whir Of Props And Squeak Of Wheels During Taxi. Very High Idle. Sound Effects and Royalty Free Sound Effects for Creative Audio Visual Projects Including YouTube, TV, Film, PowerPoint, Flash, and All Media.