For a further range.In Chinese "WP" is 涡轮喷气 means turbojet engine.It has a higher fuel consumption than the turbofan engine. I've read from a Chinese military magazine that in test H6I has a range of more than 8000km(maybe 9000km I can't make sure).And what about the original TU16 ？A WP-8 provides 93.2 kN thrust and a Rolls-Royce Spery provides 54 kN thrust. Four Spery's are about 1.2t heavier than two WP-8s. That's about 15.8% increase in thrust and 19.7% increase in mass. What exactly were they trying to accomplish with H-6I back then?