New answers tagged

2

For airplanes and cars, one approach might be to break it down to wattage per seat mile for each conveyance. Cars only need about 20-30 HP to cruise on the highway; say 22 kW. An airplane needs about 120 kW (roughly 160 HP) to have decent performance for takeoff and climb with 4 adults and a bit of luggage, and might cruise using between 50 and 75% of that. ...


3

Train wins, every single time. Zero induced drag. Thanks to the magic of Timken roller bearings (in truth, plain bearings worked even better when rolling fast enough for the hydrodynamic layer to establish itself: roller bearings are only better at starting), the train's rolling resistance is effectively zero when comparing to any other mode of ...


Top 50 recent answers are included