So I've always wondered about how the characteristics of Jets and Props differ. I've always thought of Jets as being low volume high pressure where as props of being high volume low pressure. I have a 750cc Jet ski that uses a water pump impeller as propulsion and it accelerates very quickly faster than almost all speedboats that use a conventional propeller. It doesn't have alot of top end though and has a top speed of 45mph. The speedboats take alot longer to accelerate but they will eventually surpass me. Conversely on airplanes, all the military supersonic planes use turbojets or turbofans. A big heavy cargo plane like a C-130 uses a turboprop though. From my understanding there are physical limitations that prevent a propeller driven airplane from reaching supersonic speeds, and I think that they are limited to lower altitudes. I've also heard that propeller driven planes get better fuel mileage. So maybe the real question here is thrust vs lift?