From: "Todd Bartrim bartrim@gmail.com" <flyrotary@lancaironline.net>
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Date: Tue, 20 Aug 2019 15:31:00 -0700
Message-ID: <CALYfWBvq_6DfJhw+5def7V9b0htkipCh3yHAgYDmrForZ0mRaQ@mail.gmail.com>
Subject: Re: [FlyRotary] Re: airflow characteristics-radiators and spinner
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Bill;
  Sorry to be resurrecting such an old email thread, but ever since you
made this post, I've been thinking abut these rads. The possibilities are
interesting. Do you have any other possible info on this model or any other
suitable rads?
I searched hi and low for dimensions of this rad, then found one on ebay
that was photographed on a sheet of peg board which allows for a good
estimation of size. It appears to be approx 12"x14" core and with the tanks
being wedge shaped, it looks like it may just be an ideal fit to put 2 of
these under an RV cowl.
My concerns would be; first is it appears to only be approx 1.5" thick.
Next is how thick is the aluminum on the tanks? I'm not a bad TIG welder,
but I have my limits as to how thin I can reliably weld. And I would have
to change the plumbing a little.
And what kind of pressures are they designed for? I use a 20psi cap on my
system.
I'm considering ordering one off ebay that's only $40, just to check
fitment, however they want $50 for shipping.
Up here there are more snowmobile salvage shops than motorcycle...

Todd Bartrim
C-FSTB


On Tue, Jul 9, 2019 at 2:24 PM William Jepson wrjjrs@gmail.com <
flyrotary@lancaironline.net> wrote:

> Group something else to note is that even in the P51 duct later models had
> a wing section to help direct the airflow into the top section of the duct.
> The idea has always been to slow the airflow to take advantage of whatever
> fin pitch is used and then to pinch the duct again to re-speed the
> airstream to near to the aircraft speed. Never 100% obviously but as close
> to it as possible. Now I going to pass along a possibility for cooling that
> I have told a few people but not many. There are a bunch of conformal
> radiators available to us for a reasonable cost that I am amazed nobody is
> using. High-performance motorcycle radiators. I worked for Kawasaki years
> ago and did a lot of engine building even into the water-cooled era.
> Several motorcycle manufacturers have built beautiful curved aluminum
> radiators to increase the cooling available on some of their  highest
> performance models. I have attached a jpeg of the radiator from a Kawasaki
> ZX7R. 750cc engine rated at about 110 HP. Very high heat rejection
> requirements. Lots of these components available from motorcycle salvage
> yards. often with minor damage to the end tanks, but for our use we might
> modify them anyway. Fitting one, (or two), of these curved radiators inside
> a cowl would be easyand effective. You might never get a radiator man to
> make you a ring radiator, but you can buy some that might conform very well
> to an in-cowl mounting.
> Bill Jepson
>
>
>

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<div dir=3D"ltr"><div dir=3D"ltr">Hi Bill;<div>=C2=A0 Sorry to be resurrect=
ing such an old email thread, but ever since you made this post, I&#39;ve b=
een thinking abut these rads. The possibilities are interesting. Do you hav=
e any other possible info on this model or any other suitable rads?=C2=A0</=
div><div>I searched hi and low for dimensions of this rad, then found one o=
n ebay that was photographed on a sheet of peg board which allows for a goo=
d estimation of size. It appears to be approx 12&quot;x14&quot; core and wi=
th the tanks being wedge shaped, it looks like it may just be an ideal fit =
to put 2 of these under an RV cowl.=C2=A0</div><div>My concerns would be; f=
irst is it appears to only be approx 1.5&quot; thick. Next is how thick is =
the aluminum on the tanks? I&#39;m not a bad TIG welder, but I have my limi=
ts as to how thin I can reliably weld. And I would have to change the plumb=
ing a little.</div><div>And what kind of pressures are they designed for? I=
 use a 20psi cap on my system.</div><div>I&#39;m considering ordering one o=
ff ebay that&#39;s only $40, just to check fitment, however they want $50 f=
or shipping.</div><div>Up here there are more snowmobile salvage shops than=
 motorcycle...</div><div><br clear=3D"all"><div><div dir=3D"ltr" class=3D"g=
mail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr">Todd Ba=
rtrim</div><div>C-FSTB</div></div></div><br></div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jul 9, 2019 at 2:=
24 PM William Jepson <a href=3D"mailto:wrjjrs@gmail.com">wrjjrs@gmail.com</=
a> &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironli=
ne.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex"><div dir=3D"ltr">Group something else to note is that even in the P51=
 duct later models had a wing section to help direct the airflow into the t=
op section of the duct. The idea has always been to slow the airflow to tak=
e advantage of whatever fin pitch is used and then to pinch the duct again =
to re-speed the airstream to near to the aircraft speed. Never 100% obvious=
ly but as close to it as possible. Now I going to pass along a possibility =
for cooling that I have told a few people but not many. There are a bunch o=
f conformal radiators available to us for a reasonable cost that I am amaze=
d nobody is using. High-performance motorcycle radiators. I worked for Kawa=
saki years ago and did a lot of engine building even into the water-cooled =
era. Several motorcycle manufacturers have built beautiful curved aluminum =
radiators to increase the cooling available on some of their=C2=A0 highest =
performance models. I have attached a jpeg of the radiator from a Kawasaki =
ZX7R. 750cc engine rated at about 110 HP. Very high heat rejection requirem=
ents. Lots of these components available from motorcycle salvage yards. oft=
en with minor damage to the end tanks, but for our use we might modify them=
 anyway. Fitting one, (or two), of these curved radiators inside a cowl wou=
ld be easyand effective. You might never get a radiator man to make you a r=
ing radiator, but you can buy some that might conform very well to an in-co=
wl mounting.<div>Bill Jepson</div></div><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr"><br></div></div>
</blockquote></div></div>

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