Several projects and variants were studied at tho beginning of MiG-15 development The first was twin-engined aircraft, but the project was abandoned because jet engine production was too slow to supply a sufficient number of units After Mikoyan's business trip to Great Britain and Rolls-Royce Derwent and Ncnc engines became available and OKB MiG (Mikoyan and Guryovich) began to develop 1-320 (FN) project ba sed on MiG-9 Fargo The engine section was changed, as well as cannon locations...