From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Using Fluidyne oil coolers as Primary Radiator
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Mon, 30 Jul 2018 16:10:30 -0500
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On 7/30/2018 3:53 PM, Jeff Whaley jwhaley@datacast.com wrote:
> We know the Fluidyne series of oil coolers work well to cool our oil ...
> Does anyone care to comment on how they might work as primary radiators for the water jacket if placed in a Vee formation? Open at the front and narrowed together at the back as per diagram attached. I think in most installations this is a more efficient air flow path.
> The DB-30618 x 2 have 0.75 inch connectors and 210 sq in of surface area Vs the GRI-2-58185-X Griffon radiator with 247 sq in of surface area.
> Jeff
>
1st, let me say, 'I don't know'. :-)

Having said that....

If you're doubling the face area vs a single cooler perpendicular to the 
duct, then it will probably cool a bit better, but nowhere near twice as 
good. If you're feeding that configuration from a straight duct, my 
money would be on most of the flow being through the last third of each 
cooler. It looks like basically a two sided wedge, and I can say from 
experience that a wedge diffuser will do what I described, unless the 
downstream end is pinched down so it almost touches the face of the 
cooler. Perhaps a flow divider (more or less a diamond shape) to supply 
the pinch effect would balance the flow.

It's easy enough to see the effect. Get a couple of junk coolers 
(anything would do to test, as long as they're the same cooler). Mount 
them in a cardboard duct using (wait for it...) duct tape, and feed it 
air using your leaf blower. Tie a thread (yard works better; it's 
lighter for it's cross section) to a thin stick, and move it around the 
exit faces. You'll quickly see where the air is moving through the cores 
(and where it's not).

Charlie

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