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Retrorocket
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====Project Mercury==== Due to the high reliability demanded by de-orbiting retrorockets, [[Project Mercury|Mercury]] spacecraft used a trio of solid fuel, 1000 [[Pound-force|lbf]] (4.5 [[newton (unit)|kN]]) thrust retrorockets that fired for 10 seconds each, strapped to the heat shield on the bottom of the spacecraft. One was sufficient to return the spacecraft to Earth if the other two failed.<ref>{{cite web |title=Mercury capsule description & specifications |url=https://weebau.com/flights/mercury.htm |website=weebau.com |access-date=8 January 2020}}</ref>
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