REFLECTOR: 2 Pass cooler
John Dibble
aminetech at bluefrog.com
Fri Jul 31 09:06:54 CDT 2009
I think it is always better to use the cooler air with the cooler oil.
Of course if a separate air supply is used for each cooler, that is even
better. I understand that hooking the coolers in parallel is better
than series.
John
Chuck Jensen wrote:
> Jim, not only that, but the oil in the second cooler will be, well,
> 'cooler', so there'll be less of a delta T, further reducing the
> effectiveness of the second cooler in series. Thermodynamic question.
> If one is going to stack two coolers, is it better to put the incoming
> hot oil through the front cooler that has also has the coolest air,
> knowing that the second cooler will suffer from cooler oil and warmer
> air? Or, is it better to put the second cooler that the oil passes
> through in front where it'll have the cooler incoming air. The second
> cooler in line will see warmer air, but the oil is hotter, coming
> straight from the engine......or, does it make any difference?Chuck
> Jensen
>
>
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org
> [mailto:reflector-bounces at tvbf.org]On Behalf Of Jim Agnew
> Sent: Friday, July 31, 2009 7:53 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: 2 Pass cooler
>
> The standard Velocity oil cooler at cruise will give about a
> 15 degree drop. This is based on a friends comments after
> many years of race car building and racing with similar
> coolers. I would like to know if these are stacked coolers
> is the 20% drop from the first to last cooler or overall.
> If there stacked then the second cooler is working with much
> warmer incoming air. JimJames F. Agnew
>
> Jim_Agnew_2 at Yahoo.Com
>
> Tampa, FL
>
> Velocity 173 Elite Aircraft Completed & Flying
>
> -------------------------------------------------------------
> From: "aminetech at bluefrog.com" <aminetech at bluefrog.com>
> To: Velocity Aircraft Owners and Builders list
> <reflector at tvbf.org>
> Sent: Friday, July 31, 2009 2:49:20 AM
> Subject: Re: REFLECTOR: 2 Pass cooler
>
> Stewart Warner
>
> --- scott at tnstaafl.net wrote:
>
> From: Scott Derrick <scott at tnstaafl.net>
> To: Velocity Aircraft Owners and Builders list
> <reflector at tvbf.org>
> Subject: Re: REFLECTOR: 2 Pass cooler
> Date: Thu, 30 Jul 2009 20:10:30 -0600
>
> is this the Aero-Classic cooler? Stewart Warner?
>
> John Dibble wrote:
> > Yes. I'm trying to get a feel for what a 20% increase in
> cooling means. The vendor claims
> > a 15-20 F reduction. Anyone have temperature data on oil
> in versus oil out of the cooler?
> >
> > John
> >
> > Scott Derrick wrote:
> >
> >
> >> So some plumbing changes needed to replace the
> original....
> >>
> >> John Dibble wrote:
> >>
> >>> Scott,
> >>> I lost your post, but the answer to your question is all
> dimensions including the bolt
> >>> holes are identical. The only difference is that one
> oil line connection is on the
> >>> bottom and the other on top, same side.
> >>>
> >>> John
> >>>
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