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Aircraft with 1 piston engine

aircraft class powered by a single reciprocating engine

Pronunciation
/ˈɛːkrɑːft wɪð 1 ˈpɪstən ˈɛnʤɪn/
/ˈɛrˌkræft wɪθ 1 ˈpɪstn ˈɛnʤən/