galaxy flyer
Not sure of the physics, but 11,000 hours of flying tells me the observation is true. A jet powered aircraft is thrust forward by the reaction in the engine, while a propeller aircraft action of the prop.
A turbojet derives all of it's thrust through the combustion of compressed air and fuel going out the back of the engine; a high bypass turbofan (such as the TF39, which had a bypass ratio of 8:1) derives a sizable portion of it's thrust from a fan at the front of the engine, with a smaller portion from the combustion of compressed air and fuel going out the back of the engine; a turboprop derives almost all of it's thrust via the propeller with a small amount produced by the thrust of the jet driving the propeller; a piston driven prop derives all of it's thrust via the propeller.