how the heck did you come up with that value?

is this based on any measurement?

what is the increased surface area provided by the fins? if you know that then you can start using numbers, otherwise its all hooey Scott.

alistair

On 2011-07-20, at 3:04 PM, Scott Daniel - Turbovans wrote:

> Like if there were no ribs..
> just smooth aluminum ...about a 1 and 1/2 percent difference..
> on other words, not much.