RrrrRRRrrRRRRR.

n.  the sound of a propeller plane.

<“Open the hangar door, here comes the plane,” he sang, aiming the fork at her mouth like a airplane.  “RrrrRRRrrRRRRR,” he rumbled, simulating the sound of a propeller plane.  —Robert Zimmerman, Genesis: The Story of Apollo 8: The First Manned Flight to Another World.>

rrrrrrrrrrrrrrr / rrrrrrrrrrrr.

n.  the “wonderful and chaotic” scream of sirens and horns, as sung by free jazz artist Amiri Baraka (Robert G. O’Meally, Uptown Conversation : The New Jazz Studies).

RRRRRRRRRRRrrrrrrr.

n.  the sound of an “earsplitting pulsejet”: “150 decibels of deafening noise” emitted by a fighting robot called “Pauline’s Running Machine” (Brad Stone, Gearheads: The Turbulent Rise of Robotic Sports).

<[Mark Pauline] fired up the Running Machine right then.  RRRRRRRRRRRrrrrrrr!  The noise sprayed off the walls of the hangar.  Spectators thrust their hands to their heads.  Parents grabbed their children and stampeded outside.  It was the loudest noise anyone had ever heard in their lives.  —Brad Stone, Gearheads: The Turbulent Rise of Robotic Sports.>

RRRRRRRRRRRRrrrrrrrrrrrrrrr.

n.  the grumble of an old automobile engine, as described in Ash Child: A Montana Mystery Featuring Gabriel Du Pre by Peter Bowen.

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