From: "Rob McMillan robmcmillanpls@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 22 Aug 2019 07:45:03 -0700
Message-ID: <CAJckkgNqfhgG51yBfBr3UWUw2T8hEgOvC-d8Po+6T5=GNE35yA@mail.gmail.com>
Subject: Re: [FlyRotary] Curved aluminum radiators.
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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$148 to cut one open would suck, but might it be worth knowing before
getting 2 more and doing a bunch of ducting...

On Thu, Aug 22, 2019, 2:32 AM Todd Bartrim bartrim@gmail.com <
flyrotary@lancaironline.net> wrote:

> I'm considering making some changes to my cooling system as it is not
> adequate when flying low & slow, as on recent flights on a few hot days.
> I'm still using a set of evap cores as they fit the limited space on either
> side of the PSRU in an RV cowl.
>   Bill Jepson made mention of a curved radiator earlier this summer, which
> as been simmering on a hot spot way back in my brain ever since. I've spent
> the last few days looking real hard at the idea.
> The size and shape of the curve looks like it would conform quite nicely
> to the bottom of the RV cowl. so that the top of the rad would be
> perpendicular to the airflow while the bottom will curve away. This would
> require a new ducts to be glassed to take advantage of this, but that would
> allow for more time and room to slow down the airflow for greater
> efficiency. It would also almost double the square inches of cooling area
> than I currently have, however as it is thinner it would provide half of
> the cubic inches of volume as I currently have.
>  The small thick rads I currently use were chosen more with high speeds in
> mind (well, and of course ease of installation), but now I'm thinking that
> I'd rather have a thinner rad that would perform better on the ground and
> in slow flight. These curved rads seem like they could offer some
> advantages.
>   I've just found them listed on Amazon.ca for $148CAD with free shipping
> (x2)which seems pretty resonable, so for $300, it might offer a significant
> cooling upgrade.... or maybe not.
> I wish I could find an old one to cut open to inspect, test weld, check
> for fit, etc.
>
> Does anybody have any thoughts on the idea? I'm on the edge so it wouldn't
> take much to push me over, or pull me back....
>
> Todd Bartrim
>

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<div dir=3D"auto"><span class=3D"money">$148</span>=C2=A0to cut one open wo=
uld suck, but might it be worth knowing before getting 2 more and doing a b=
unch of ducting...</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">On Thu, Aug 22, 2019, 2:32 AM Todd Bartrim <a href=3D"mai=
lto:bartrim@gmail.com">bartrim@gmail.com</a> &lt;<a href=3D"mailto:flyrotar=
y@lancaironline.net">flyrotary@lancaironline.net</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex"><div dir=3D"ltr">I&#39;m considering making so=
me changes to my cooling system as it is not adequate when flying low &amp;=
 slow, as on recent flights on a few hot days. I&#39;m still using a set of=
 evap cores as they fit the limited space on either side of the PSRU in an =
RV cowl.<div>=C2=A0 Bill Jepson made mention of a curved radiator earlier t=
his summer, which as been simmering on a hot spot way back in my brain ever=
 since. I&#39;ve spent the last few days looking real hard at the idea.</di=
v><div>The size and shape of the curve looks like it would conform quite ni=
cely to the bottom of the RV cowl. so that the top of the rad would be perp=
endicular to the airflow while the bottom will curve away. This would requi=
re a new ducts to be glassed to take advantage of this, but that would allo=
w for more time and room to slow down the airflow for greater efficiency. I=
t would also almost double the square inches of cooling area than I current=
ly have, however as it is thinner it would provide half of the cubic inches=
 of volume as I currently have.</div><div>=C2=A0The small thick rads I curr=
ently use were chosen more with high speeds in mind (well, and of course ea=
se of installation), but now I&#39;m thinking that I&#39;d rather have a th=
inner rad that would perform better on the ground and in slow flight. These=
 curved rads seem like they could offer some advantages.</div><div>=C2=A0 I=
&#39;ve just found them listed on Amazon.ca for $148CAD with free shipping =
(x2)which seems pretty resonable, so for $300, it might offer a significant=
 cooling upgrade.... or maybe not.</div><div>I wish I could find an old one=
 to cut open to inspect, test weld, check for fit, etc.</div><div><br></div=
><div>Does anybody have any thoughts on the idea? I&#39;m on the edge so it=
 wouldn&#39;t take much to push me over, or pull me back....<br><div><br></=
div><div><div><div dir=3D"ltr" class=3D"m_-1036793640663170421gmail_signatu=
re" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Todd Bartrim</div><=
/div></div></div></div></div>
</blockquote></div>

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