B-W was referring to area, so it's not an insignificant increase.

0.196 in^2 vs 0.110 in^2 = 77.8% increase in area (per inch of length for volume of the gas)

But I don't believe cross-sectional area is the critical factor. Surface area for condensation is what's important: 2*pi*r*l.

1.57 in^2 per inch of length vs. 1.18 in^2 per inch of length = 33% increase in surface area. (Same percentage increase as from 3/8 to 1/2 , not 25%)

Owing to other inefficiencies (non-linear nature of vapor condensation, etc.) and inaccuracy of measurement, I think a 25% increase in speed would not be an unreasonable expectation in this case.

-j

--- In new_distillers@yahoogroups.com, RLB wrote:

>

> Simple: 3/8th = 3 divided by 8 = 0.375"

> 4/8 or 122 = 4 divided by 8 = 0.50"

> 0.500 - 0.375 = 0.125 or 1/8

>

> Not a lot of difference, but bigger is faster

>

> Robert

> ________________________________

> From: Blackhat-Whitedog

>

> 3/8th vs 4/8th is about 25% larger should mean that much faster (I did the pi r squared and that made it seem twice as big...math makes my head hurt...or is that the 4 roses)