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Date: Tue, 23 Oct 2012 08:48:56 -0500
Message-ID: <CAHh3jbPgzLqsa8ffo12pYznP1O+fVO1jqyRejW+8qD0+CYNe-g@mail.gmail.com>
Subject: Re: [FlyRotary] Re: flow path in conventional radiator
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=e89a8ff1c22c3a0a9b04ccba3b84

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On Tue, Oct 23, 2012 at 8:16 AM, Ernest Chrisltey <echristley@att.net>wrote:

>  On 10/23/2012 06:44 AM, Mark Steitle wrote:
>
> Bill,
>
>  Since Charlie hasn't posted any pictures or sketches of his design, I
> was referencing more what you'll find in auto installations than in a/c.
>  Still the principles are the same, namely that the coolant naturally flows
> to the bottom and air goes to the top.  If it gets low enough, the pump
> will begin sucking air and will soon loose prime.  This will happen much
> quicker if you're drawing off the upper tank.  Of course, if the radiator
> is located below the engine it will take longer for this to happen than if
> it is beside the engine because the air pocket will be inside the engine
> rather than in the radiator.  If you have a coolant leak in flight, you'll
> benefit from more time to get on the ground rather than less.
>
>  I don't see where it makes any difference which tank you *return* the
> coolant to, but when supplying the pump, any air will risk loss of prime.
>  So, it makes sense to me to draw from the bottom and return to the top.
>  At least that's how I understand it.
>
>   In the end its Charlie's decision.
>
>  Mark,
>
> My installation is done and is working, so I don't see myself making great
> efforts to change it around; but this makes so much sense that I'll
> rearrange it if I ever have to rework it in the future.  The downside to
> this arrangement is that it will be much more difficult  to remove
> entrapped air from the system if there isn't a bleed in the line.
>

Agreed... so, install a bleed line.  I have one that runs from the top of
the outlet tank (crossflow radiator) to the swirl tank.  Entraped air has
never been a problem.

Mark

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<br><br><div class=3D"gmail_quote">On Tue, Oct 23, 2012 at 8:16 AM, Ernest =
Chrisltey <span dir=3D"ltr">&lt;<a href=3D"mailto:echristley@att.net" targe=
t=3D"_blank">echristley@att.net</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">

 =20
   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF"><div class=3D"im">
    <div>On 10/23/2012 06:44 AM, Mark Steitle
      wrote:<br>
    </div>
    <blockquote type=3D"cite">Bill,=A0
      <div><br>
      </div>
      <div>Since Charlie hasn&#39;t posted any pictures or sketches of his
        design, I was referencing more what you&#39;ll find in auto
        installations than in a/c. =A0Still the principles are the same,
        namely that the coolant naturally flows to the bottom and air
        goes to the top. =A0If it gets low enough, the pump will begin
        sucking air and will soon loose prime. =A0This will happen much
        quicker if you&#39;re drawing off the upper tank. =A0Of course, if =
the
        radiator is located below the engine it will take longer for
        this to happen than if it is beside the engine because the air
        pocket will be inside the engine rather than in the radiator.
        =A0If you have a coolant leak in flight, you&#39;ll benefit from mo=
re
        time to get on the ground rather than less.=A0</div>
      <div><br>
      </div>
      <div>I don&#39;t see where it makes any difference which tank you <u>=
return</u>
        the coolant to, but when supplying the pump, any air will risk
        loss of prime. =A0So, it makes sense to me to draw from the bottom
        and return to the top. =A0At least that&#39;s how I understand it.<=
/div>
      <div><br>
      </div>
      <div>=A0In the end its Charlie&#39;s decision.</div>
      <br>
    </blockquote></div>
    Mark, <br>
    <br>
    My installation is done and is working, so I don&#39;t see myself makin=
g
    great efforts to change it around; but this makes so much sense that
    I&#39;ll rearrange it if I ever have to rework it in the future.=A0 The
    downside to this arrangement is that it will be much more difficult=A0
    to remove entrapped air from the system if there isn&#39;t a bleed in
    the line.<br>
  </div>

</blockquote></div><br><div>Agreed... so, install a bleed line. =A0I have o=
ne that runs from the top of the outlet tank (crossflow radiator) to the sw=
irl tank. =A0Entraped air has never been a problem.</div><div><br></div><di=
v>
Mark</div>

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