Quite a subjective question. This depends on the type of rescue helicopter, in the UK the follow are used: Westland Sea King HAR3 or HAR 5: 129 mph (112 knots, 208 km/h) (max cruise at sea level)...
The name of the first helicopter was called kiteoki(meaning an air transport)founded by an African mythologist by the name NKOANA KHUTSO.The first helicopter he created reached an approximate speed...
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