But he is right though ... why does China need to spend resources on a NK-32 thrust class engine if there is no usage? The engines should always be derived from aircraft needs and in this case, there is no need for some engine like this. It would make no sense to spend hundreds of millions to billions of dollars and multiple years to develop an engine with no use.This kind of thinking is exactly the mistake that set back China's engine programs. The worst thing you can do to engine development is tightly couple it to specific airframes. Engine development lifecycles are generally much longer than airframe cycles, so if an airframe is modified or dropped, the engine is left in limbo. Engine development needs to be as independent as possible and work under the philosophy of "if you build it, they will come."