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Hi,
The Japanese company NAMC YS-12 was developed from YS-11 but
powered by two Rolls Royce dart RDa 10s ,YS-31 was with two RDa 7s
and the YS-12-4 was with four RDa 10 engines.
http://www.flightglobal.com/pdfarchive/view/1959/1959 - 3097.html?search=ys-12
The Japanese company NAMC YS-12 was developed from YS-11 but
powered by two Rolls Royce dart RDa 10s ,YS-31 was with two RDa 7s
and the YS-12-4 was with four RDa 10 engines.
http://www.flightglobal.com/pdfarchive/view/1959/1959 - 3097.html?search=ys-12
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