Fairings for an Upright Hybrid Bicycle? Do front fairings have an advantage for upright bicycles?



There are fairings for recumbent bicycles such as this Zipper one:


I wanted to know if anybody has experienced increase in speed/reduction in air drag with a fairing [with an upright hybrid].

I saw the body of F40 bike(http://www.lightningbikes.com/f40/) and I was wondering if such an aero design exists for upright bikes and if doesn't, exist would making such a aero design for upright bike worthwhile?
I have read an article regarding partial fairings for upright bikes.

It is interesting that a partial fairing will reduce the energy needed to keep the bike rolling at 35km/h while in a fairly relaxed riding position by about 1/4 (220 watts to about 160 watts)!! (Data sourced to David Gordon Wilson, Bicycling Science, 3rd ed., p.188).

So the heck with the speed or rain rationalizations: if you want to travel farther and conserve energy in the process (a.k.a. touring), a partial fairing should definitely be considered!