On Thu, 9 Dec 2010 13:27:59 -0800 (PST), Andy
wrote:

I'm more interested in real performance numbers though. I don't mind
getting the back of my head wet a couple of times a year for a gain 50
fpm at 90 kts. 0.001 fpm at 90 kts and maybe it's not worth the risk
of getting wet.

If Francisco de Almeida's (Hi pal!) math is correct, and ventilation
at 100kts really costs 30W, then I believe we're talking about a
potential reduction in drag between 0,5% and 0,1%.

Well, my math isn't going to pass any tests...

aldo cernezzi