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References: <list-5474799@logan.com>
Date: Mon, 9 Apr 2012 22:04:57 -0500
Message-ID: <CAHh3jbMLNJYQD4AQm5nQ33fAAhh7+MVp12P+84nBrwL-GvEd5g@mail.gmail.com>
Subject: Re: [FlyRotary] OMP
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=00151747809e46e9fe04bd4a63c3

--00151747809e46e9fe04bd4a63c3
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Steve,

I disassembled both the 13b and 20b OMPs tonight.  Best I can tell, the OMP
doesn't actually pump oil as much as it "meters" the oil.  It appears to be
a small spool valve device.  Instead of the spool moving, the lever moves
the outer part back and forth in relation to the spool valve.  Moving the
lever full open causes the outer body to move in relation to the spool
valve allowing oil to flow through the passages providing maximum oil flow.
 Move the lever the other way and the outer body moves the other direction
(in relation to the spool valve) reducing oil flow.  When the outer body
moves from closed to open, its holes come into alignment with the outlet
holes in the OMP.  Excess oil is routed through the pump body to the
crankcase.  At least that's how I think it works, but then I could be wrong.

If I could drill out one of the smaller outlets to equal the larger ones,
then this may work just fine for the 3-rotor.  Following the 20b design, I
could then plug the 4th hole.


Mark


On Mon, Apr 9, 2012 at 8:49 PM, Steven W. Boese <SBoese@uwyo.edu> wrote:

>  Mark and all,
>
>
>
> The information that I previously gave on the '86 OMP delivery is in
> error.  After further analysis of the disassembled OMP, I realized that the
> delivery rate for the front two ports depends on the DIFFERENCE between the
> diameters of the two sections of the pump piston.  The result is that all
> four of the ports deliver the same flow rate.  This would make the
> application of this OMP to a three rotor engine more difficult, in my
> opinion.  Of course I could be wrong about that, too.
>
>
>
> I apologize for the mistake.
>
>
>
> Steve
>
>
>

--00151747809e46e9fe04bd4a63c3
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Steve,=A0<div><br></div><div>I disassembled both the 13b and 20b OMPs tonig=
ht. =A0Best I can tell, the OMP doesn&#39;t actually pump oil as much as it=
 &quot;meters&quot; the oil. =A0It appears to be a small spool valve device=
. =A0Instead of the spool moving, the lever moves the outer part back and f=
orth in relation to the spool valve. =A0Moving the lever full open causes t=
he outer body to move in relation to the spool valve allowing oil to flow t=
hrough the passages providing maximum oil flow. =A0Move the lever the other=
 way and the outer body moves the other direction (in relation to the spool=
 valve) reducing oil flow. =A0When the outer body moves from closed to open=
, its holes come into alignment with the outlet holes in the OMP. =A0Excess=
 oil is routed through the pump body to the crankcase. =A0At least that&#39=
;s how I think it works, but then I could be wrong.</div>
<div><br></div><div>If I could drill out one of the smaller outlets to equa=
l the larger ones, then this may work just fine for the 3-rotor. =A0Followi=
ng the 20b design, I could then plug the 4th hole. =A0<br><br><br>Mark</div=
>
<div><br></div><div><br><div class=3D"gmail_quote">On Mon, Apr 9, 2012 at 8=
:49 PM, Steven W. Boese <span dir=3D"ltr">&lt;<a href=3D"mailto:SBoese@uwyo=
.edu">SBoese@uwyo.edu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x">





<div>
<div style=3D"direction:ltr;font-size:10pt;font-family:Tahoma">
<p>Mark and all,</p>
<p>=A0</p>
<p>The information that I previously gave on the &#39;86 OMP delivery is in=
 error.=A0 After further analysis of the disassembled=A0OMP, I realized tha=
t the delivery rate for the front two ports depends on the DIFFERENCE betwe=
en the diameters of the two sections of
 the pump piston.=A0 The result is that all four of the ports deliver the s=
ame flow rate.=A0 This would make the application=A0of this OMP to a three =
rotor engine more difficult, in my opinion.=A0 Of course I could be wrong a=
bout that, too.</p>

<p>=A0</p>
<p>I apologize for the mistake.</p>
<p>=A0</p>
<p>Steve</p>
<p>=A0 </p>
</div>
</div>

</blockquote></div><br></div>

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