Encyclopedia > 1171

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Centuries: 11th century - 12th century - 13th century

Decades: 1120s 1130s 1140s 1150s 1160s - 1170s - 1180s 1190s 1200s 1210s 1220s

Years: 1166 1167 1168 1169 1170 - 1171 - 1172 1173 1174 1175 1176




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... the sonic boom of the fan inside the engine where it is largely muted. Such is not the case on a propfan. Propfans were at one time thought to be the next logical step ...