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Drops (sitting upright): area = 0.433
Here is a table that shows the areas and the %
difference from the minimum area (roll
position):
Here are some side views of the normal, tip, and
back positions (yeah, I know that my garage is a
mess):
normal position
tip position
back position
I regularly employ all these positions when
riding.
Observations
The 10,000 foot analysis suggests that in my
normal position, the frontal area is fairly
consistent whether I am in the front/normal/back
position (a few percent variation).
However, it appears that as I slide forward, my
front end comes up a bit and increases frontal
area - darn near linearly, huh?
I also noticed that I may have a bit of a pedal
stroke flaw when contorting myself into these
positions - check out these animations (forgive
the website name across the images, but I had to
do it since last time I posted stuff like this,
I had some "borrowing" issues) -
 
You can see that in one of the frames, my right
leg flares out a bit. The instantaneous
frontal area on these frames increased by ~ 8%.
This illustrates what we all know about the
importance of keeping the knees in for best
aerodynamics.
It also looks as if the "roll" position that
Danny Pate employs also presents a smaller
frontal area for me. I have used this
position for short periods (75% of a 20k TT),
but staying in that position for a long time
requires concentration and generally makes me
get headaches later in the day - eye strain from
looking "up" without moving my head, I reckon.
I could also probably benefit from doing
something with my "fat" brake levers - those
things are huge! Also, the area behind my
head looks like it could benefit from a head
fairing.
Anyway, I am no positioning expert, but figured
you all might be interested in what I found out.
As always, all comments/criticisms are welcome.
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