The RB.432 is an unbuilt design for a turbofan in the 18,000 lbf/80 kN thrust class, for airliners of up to 150 passengers. This project ran in the late 1970s. The Fokker Super F28 brochure devotes one page to the engine.
It's a two-shaft turbofan with a bypass ratio of 4.8.
Ultimately the...