You should be able to get flow rate; pressure drop; heat rejection rating from Fluidyne.  Based on my calcs, it would be good to about a steady 120 hp in a rotary, if you get good air flow through it. 

How can you calculate this without the info you mentioned?   How much air flow is "good".  What is the temp?  I appreciate the thought, but I don't really believe all the calculations in the world will give a real answer when you consider all the variables.  It might be interesting, and will certainly be in the ballpark, but you won't really know how it works until you try it.  

My more simplified way to look at this is that the Fluidyne has the same core volume as the 2nd gen cooler.  It is thicker, which reduces the cooling ability, but I also bet that it's more efficient at rejecting heat.  In other words, it seems like it should be about equal to the 2nd gen cooler.  Since lots of folks are running the 2nd gen cooler, and most are pretty happy with it, then I have to believe that this will work at least reasonably well for me.  Since it will stand upright under the engine, I should be able to give it a far superior duct to anything I've ever used.  I'm going to try it, but realize that I may take over the record for number of oil cooler mods from Ed.

Cheers,

Rusty (abandoned calculus long ago)