Tandem
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Tandem, or in tandem, is an arrangement in which two or more animals, machines, or people are lined up one behind another, all facing in the same direction. Tandem can also be used more generally to r
Horses hitched in tandem pulling a carriage
Draft horses chain-hitched in tandem; carter standing in usual position beside rear horse
The driver sits high enough to see over the leader and is carrying a whip long enough to reach the lead horse's shoulder
Tandem bicycle
Harbin Z-19
Videos
The Harbin Z-19 is a Chinese light reconnaissance/attack helicopter developed by Harbin Aircraft Manufacturing Corporation for the People's Liberation Army Air Force and the Ground Force Army Aviation
Harbin Z-19 making a low-level pass at Zhuhai Airshow 2012
Harbin Z-19 at the China Helicopter Exposition, Tianjin 2013