"recumbent cycles are faster under many conditions"
Is this demonstrably true under less than ideal conditions? I have been a cyclist for almost four decades and for a good three of those recumbent bicycles have been touted as faster and better. Yet I have never been passed by a recumbent. Not once. Ever. I have on the other hand passed many, though admittedly there are few on the road and usually ridden by old farts (to which I a rapidly becoming one). I understand that if you put an enclosure around a recumbent and run it on salt flats, you will hit a higher top speed. How does it fair in the Alps? In a crowded city with tight turns? It has always seemed to me that the recumbent position is countered by both the ability to stand up and put weight on the pedals for speed/acceleration and having a shorter wheel base while being on a taller pivot for handling.
There is a strong selection effect given that people who are competitive bicyclists in general won't ride recumbents since you will then be restricted to HPV competitions.
Re: handling, my Lightning recumbent is way more nimble than any bicycle I've ever ridden, precisely because the wheelbase is shorter and the CG is lower to the ground than a normal bicycle.
Set aside recumbents. How about small-wheeled uprights? The world upright speed record was set, and has held for 20 years, on a 17 inch steel bicycle with full suspension (a Moulton AM). There are strong arguments to be made that smaller-wheeled bikes allow for much faster and better designs: yet because the UCI banned them in the 1960s for being too fast, the industry was ruined and the only ones you can get nowadays are either folders (Brompton, Bike Friday Tikit) or bespoke Moultons.
BTW: recumbents can have just as short a wheelbase as an upright, as well as about as high a center of gravity position. See for example http://www.wisil.recumbents.com/wisil/racing2007/xenia2007/i... The big issue with recumbents is that humans are designed to apply torque vertically, and torque is what you need for climbing; while aerodynamics are what you need for descending and on straights.
Is this demonstrably true under less than ideal conditions? I have been a cyclist for almost four decades and for a good three of those recumbent bicycles have been touted as faster and better. Yet I have never been passed by a recumbent. Not once. Ever. I have on the other hand passed many, though admittedly there are few on the road and usually ridden by old farts (to which I a rapidly becoming one). I understand that if you put an enclosure around a recumbent and run it on salt flats, you will hit a higher top speed. How does it fair in the Alps? In a crowded city with tight turns? It has always seemed to me that the recumbent position is countered by both the ability to stand up and put weight on the pedals for speed/acceleration and having a shorter wheel base while being on a taller pivot for handling.