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From: "Monty Roberts" <montyr2157@alltel.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-1690378@logan.com>
Subject: Re: EM2 Data Logger pix 
Date: Wed, 3 Jan 2007 10:08:15 -0600
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Tracy,

After looking back through my cooling calcs, the one other piece of info 
that is an assumption is the Velocity at the cooling inlet. The two 
assumptions that I have had to make are the ratio of the inlet velocity to 
the free stream and the temperature rise across the cooler. Turns out I was 
very conservative on the delta T. I used 80 deg F. Looks like you are 
getting a lot better than that. I did calcs for a range of Vi/Vo from .5-.9 
. It makes quite a difference and is somewhat installation dependant. I'm 
guessing you are getting mostly external diffusion. So we should be able to 
get some idea of the radiators resistance to flow.

Which duct are you measuring? The one with just the evap core or the split 
duct with the evap core and the oil cooler?

Monty