From: "jay bendlin drhyed@yahoo.com" <flyrotary@lancaironline.net>
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Date: Thu, 22 Aug 2019 15:29:07 +0000 (UTC)
To: "Rob McMillan robmcmillanpls@gmail.com" <flyrotary@lancaironline.net>
Message-ID: <1498865665.550698.1566487747210@mail.yahoo.com>
In-Reply-To: <list-12872697@logan.com>
References: <list-12872697@logan.com>
Subject: Re: [FlyRotary] Re: Curved aluminum radiators.
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 I think if you start exploring motorcycle cooling you may find some soluti=
on. Most sportbikes have been making 120-200+ hp for 20 years now and most =
use curved rads, and many sport touring and endro type bikes have unique co=
oling solutions, if you start doing google image searches you will probably=
 find ideas left and right. I had a Honda RC-51 that used very small (in my=
 opinion) side-mounted radiators, you could also look at Honda VFR radiator=
s (came in several engines sizes 750-800), also small side mounts but they =
were not curved. Its amazing how much horsepower can be cooled with such sm=
all frontal area, but that's where engineers earn their keep.=C2=A0=C2=A0
    On Thursday, August 22, 2019, 10:44:58 AM EDT, Rob McMillan robmcmillan=
pls@gmail.com <flyrotary@lancaironline.net> wrote: =20
=20
 $148=C2=A0to 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@lan=
caironline.net> wrote:

I'm considering making some changes to my cooling system as it is not adequ=
ate when flying low & slow, as on recent flights on a few hot days. I'm sti=
ll using a set of evap cores as they fit the limited space on either side o=
f the PSRU in an RV cowl.=C2=A0 Bill Jepson made mention of a curved radiat=
or earlier this summer, which as been simmering on a hot spot way back in m=
y brain ever since. I've spent the last few days looking real hard at the i=
dea.The size and shape of the curve looks like it would conform quite nicel=
y to the bottom of the RV cowl. so that the top of the rad would be perpend=
icular 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 f=
or more time and room to slow down the airflow for greater efficiency. It w=
ould 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.=C2=A0The small thick rads I currently use were=
 chosen more with high speeds in mind (well, and of course ease of installa=
tion), but now I'm thinking that I'd rather have a thinner rad that would p=
erform better on the ground and in slow flight. These curved rads seem like=
 they could offer some advantages.=C2=A0 I've just found them listed on Ama=
zon.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 w=
ish I could find an old one to cut open to inspect, test weld, check for fi=
t, 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
 =20
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<html><head></head><body><div class=3D"ydp31446a8dyahoo-style-wrap" style=
=3D"font-family: verdana, helvetica, sans-serif; font-size: 13px;"><div></d=
iv>
        <div dir=3D"ltr" data-setdir=3D"false">I think if you start explori=
ng motorcycle cooling you may find some solution. Most sportbikes have been=
 making 120-200+ hp for 20 years now and most use curved rads, and many spo=
rt touring and endro type bikes have unique cooling solutions, if you start=
 doing google image searches you will probably find ideas left and right. I=
 had a Honda RC-51 that used very small (in my opinion) side-mounted radiat=
ors, you could also look at Honda VFR radiators (came in several engines si=
zes 750-800), also small side mounts but they were not curved. Its amazing =
how much horsepower can be cooled with such small frontal area, but that's =
where engineers earn their keep.&nbsp;&nbsp;</div><div><br></div>
       =20
        </div><div id=3D"ydpef39e05yahoo_quoted_6728829652" class=3D"ydpef3=
9e05yahoo_quoted">
            <div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
               =20
                <div>
                    On Thursday, August 22, 2019, 10:44:58 AM EDT, Rob McMi=
llan robmcmillanpls@gmail.com &lt;flyrotary@lancaironline.net&gt; wrote:
                </div>
                <div><br></div>
                <div><br></div>
                <div><div id=3D"ydpef39e05yiv0962372636"><div><span class=
=3D"ydpef39e05yiv0962372636money">$148</span>&nbsp;to cut one open would su=
ck, but might it be worth knowing before getting 2 more and doing a bunch o=
f ducting...</div><br><div class=3D"ydpef39e05yiv0962372636gmail_quote"><di=
v dir=3D"ltr" class=3D"ydpef39e05yiv0962372636gmail_attr">On Thu, Aug 22, 2=
019, 2:32 AM Todd Bartrim <a href=3D"mailto:bartrim@gmail.com" rel=3D"nofol=
low" target=3D"_blank">bartrim@gmail.com</a> &lt;<a href=3D"mailto:flyrotar=
y@lancaironline.net" rel=3D"nofollow" target=3D"_blank">flyrotary@lancairon=
line.net</a>&gt; wrote:<br></div><blockquote class=3D"ydpef39e05yiv09623726=
36gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;paddin=
g-left:1ex;"><div dir=3D"ltr">I'm considering making some changes to my coo=
ling system as it is not adequate when flying low &amp; 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.<div>&nbsp; Bill=
 Jepson made mention of a curved radiator earlier this summer, which as bee=
n simmering on a hot spot way back in my brain ever since. I've spent the l=
ast few days looking real hard at the idea.</div><div>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 whi=
le 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 t=
he square inches of cooling area than I currently have, however as it is th=
inner it would provide half of the cubic inches of volume as I currently ha=
ve.</div><div>&nbsp;The small thick rads I currently use were chosen more w=
ith 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 of=
fer some advantages.</div><div>&nbsp; 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.</div>=
<div>I wish I could find an old one to cut open to inspect, test weld, chec=
k for fit, etc.</div><div><br></div><div>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....<br><div><br></div><div><div><div dir=3D"ltr" class=3D"ydpef39e=
05yiv0962372636m_-1036793640663170421gmail_signature"><div dir=3D"ltr">Todd=
 Bartrim</div></div></div></div></div></div>
</blockquote></div></div></div>
            </div>
        </div></body></html>
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