 This was the main problem the "Falco" II set out to fix, now having a 1,175 hp Alfa Romeo inline engine (a more powerful and reliable license-built German DB 601) rather than a 986 hp Piaggio P.IX radial engine.Incorporating much of the Re.2000's fuselage structure, even retaining the entire tail unit, the Re.2001's wings were of semi-elliptical design with three spars in each wing.The initial design had conventional fuel tanks with 544 l total capacity (five tanks, one in the fuselage and the others in the wings).