As you know i've been asking questions about alternative fuels and honestly its getting me no where, because I desire alot more power than what our time has to offer with electricity and other things lol BUT if there is one thing i know about, it is a flippin car motor and how to make alot of horsepower, (I'm a hoosier boy=p) so i can easily get my hands on 450ft/lbs torque@3XXXRPM and 310hp@6XXXRPM for a power supply. I want to manipulate the rotation of an axial type turbofan (since its gonna be handmade and hopefully be made correctly. I'm lookin at a 48" opening with a 10" exit) I want to create something like a 9 stage turbine like alot of the higher powered jets and airliners use. my question is, would running the exhaust of the engine through the turbine increase the velocity? i dont know much about airflow but i think i remember something about wider spread out air molecules move more matter covering more distance...er something close to that...i suck at wording out this stuff. i'd love to have an answer soon tho now to the manipulation part of the idea, this axial fan along with the oiled bearings and shaft will probably weigh around 300lbs. I want to get the most out the rotation, since there is no serious friction contact (like transmissions have so they use reverse gear calcs) would it be possible for me to have a 1:5 rotation? example; my engine will idle at 800rpms, the fan will be rotating at 4,000rpms. i read that thrust (in measurement) is a little over half the horsepower required (3900lbf needs 5400hp*not exact numbers but close*) but i'm guessing that measurement was from a direct hook up with no gearing change like i'm stating above. so with a 1:5 ratio, that would put my torque at 2,250lbs and 1,550hp, so in theory would I be able to produce 1,119lbf of thrust? i mean thats alot compared to how light the vehicle is going to weigh. the b-2 bomber will actually have a higher thrust to weight ratio than this vehicle would if my theory is correct. *weighing at 370,000lbs and only using 71,600lbf of thrust while cruising at 550mph* I know i wont be able to go 500mph but thinking upon how an engine revs almost instantaneously, the turbine would wind up and move alot of air really fast shouldnt it?? if you answer everything, i'll love you haha. i'm sorry for no equations, i'm a musician...not a physicist.