From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Using Fluidyne oil coolers as Primary Radiator
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-ID: <d69a38b6-2a85-3229-585b-06acd9754055@gmail.com>
Date: Mon, 30 Jul 2018 16:22:52 -0500
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On 7/30/2018 4:10 PM, Charlie England ceengland7@gmail.com wrote:
> 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
Duh. Wish I could blame spelling errors on autocorrect... That should be 
'yarn', not 'yard'.

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