Aerobatic Sighting Device
Mike Goulian's Extra EA-300SC, Aerobatic Sighting Device, at the 2013 California Capital Airshow.
You can see the thick black tube comes out of the end of each wing, and a small hollow triangle of smaller tubes is stuck to the large tube so that the point of the triangle points upwards. They are wing-tip aerobatic sighting rods used to perform precise maneuvers.
2013 California Capital Airshow
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