They have mainly disappeared now, but for many years the taxis in Hong
Kong (Toyota Crowns) had a dual roof. On top of the regular roof, and
separated by about an inch, was another roof. The idea was that the flow
of air between the two roofs, as well as the shade, I guess, would make
for a cooler car. Perhaps this was because there was no air conditioning,
or to ease the burden on the air conditioner. I forget now, it was a long
time ago.

Ah, I found a picture:

http://en.wikipedia.org/wiki/Taxicabs_of_Hong_Kong#/media/File:HK_Toyota_Co
mfort_Red_Taxi.jpg

Perhaps if this really works, you could find a wrecked Westy, cut off the
roof, and put it on top of the existing roof. Might get you a mention in
�There, I fixed it.� (http://failblog.cheezburger.com/thereifixedit) :-)

�r

On 2015-06-11, 7:52 PM, "PSD" <psdooley@VERIZON.NET> wrote:

>Considering the Westy top, the heat transfer would be through conduction,
>through fiberglass, which isn't a good conductor.
>You would need to get 2 Westys, one with a light top, one with dark, park
>them side by side and measure the inside temperature.  It would also be
>interesting to measure the inside surface temp of the pop tops.