Thinking about real reinventing bicycle - in my opinion both upright and recumbents are very old and bad concepts, but I realized there are people who love to ban me for that ;-( Cui bono ;-) ?
My best next bike would be kind of rowbike, birdofprey. Love "SUV" bikes - sport, utility & excercise HPV. And as I have option to ride on bike 1/3 of way to work whole year unless switching to 1-2 car(s) or motorbike(s) - no more alternatives there...
My plan or dream was low head first bike similar to "teoretical" Superman position on upright, but during winter it would be nice to have kind of tent around also against cold, wind, rain, snow...
Tested few prototypes yet, now planning to sew a tent like box from nonwoven and hazel branches (light, cheap "green" materials), but not sure about, shape, size, etc.
Would it be better to close torso by a streamlined(?) shape and left hands out, put them inside that "tent", close upper part of wheels or not. Is it worth to use only 4th fairing below or close it a bit more, would it be good to create few streamlined shapes around particulars - torso, hands, wheels, legs, etc.
Would it be better to fix comfortable box to bike or to clothes like jacket where I started my attempts ?
Only clear now even supported by serious study is there is quite simple big fairing that can decrease drag coeficient say 4x...
In case of build new bike concept from scratch, me I would start with a volume, front area, weight and shape variables. And then imagine or model how to ride with smallest energy consumption Car top carrier and attach 3-4 wheels could probably be unbeatable start, then optimise shape of the box, etc.
Are there velomobile alternatives, something closer to, but build on up-right or similar cheap old school base or something modern like https://www.rowbike.com/, https://birdofpreybicycle.bigcartel.com/, etc. ? Lighter then velo and better than classic, recumbent or even race bike ?
Maybe good inspiration(-s) for such light foldable velo concepts ?
Having something like this instead of fairing should improve both drag (similar like mentioned fairing) and comfort (rain, wind, cold), maybe easiest as kind of jacket to be easily attachable ? From my tests it seems back jacket extension do not have much sense - there is teoretical limit 10% improvement comparing to 4,5x lower drag of best front fairing.