as I added to my 1st post, the Aerodynamic body around a tadpole velomobile the smooth airflow will allow the rider

to go faster for the same effort, as you would riding a similar trike with the worse aerodynamics of just being lower and sitting back

Airflow Turbulence and all that , But there is some weight added and you have to come up with the 6 thousand plus $$, purchase price

and the truck freight to get it to your door wont be cheap either..