From: "David COOK hoursaway1@comcast.net" <flyrotary@lancaironline.net>
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Date: Fri, 30 Apr 2021 19:26:52 -0400 (EDT)
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <1020013569.264731.1619825212272@connect.xfinity.com>
In-Reply-To: <list-1465629@logan.com>
References: <list-1465629@logan.com>
Subject: Re: [FlyRotary] Re: PSRU thrust bearing/washer
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Hello Steve, so if the line pressure oil is pushing out the air into eng. o=
il pan, the gearbox is eventually all oil, no air so no more aeration of th=
e oil, right.        David R. Cook   Holt MI    RV6A Rotary=20

>     On 04/30/2021 2:00 AM Sboese sboese@uwyo.edu <flyrotary@lancaironline=
.net> wrote:
>     =20
>     =20
>     Neil,
>     =20
>     With a -6 drain line to the crankcase, air that was initially inside =
the gearbox is mixed with the oil and this mixture is forced out the drain =
by an equal volume of pure oil coming in.  Eventually all the air is elimin=
ated and the gearbox is completely filled with oil.  An RD (Tracy Crook) re=
drive fitted with a -10 (5/8=E2=80=9D) id drain and a vent from the upper p=
art of the redrive to the upper part of the crankcase will not fill up with=
 oil and only have crankcase pressure inside.
>     =20
>     Steve Boese=20
>=20
>=20
>         > > On Apr 29, 2021, at 4:25 PM, flyrotary@lancaironline.net wrot=
e:
> >=20
> >=20
> >     >=20
>         > >=20
> >         =E2=97=86 This message was sent from a non-UWYO address. Please=
 exercise caution when clicking links or opening attachments from external =
sources.
> >=20
> >=20
> >         Mat,
> >=20
> >                         Oil into the redrive is needed mainly for lubri=
cation and also heat transfer.  Very little is needed as lubrication needs =
little with oils these days.  It appears that In most cases the redrive act=
ually fills and does not drain readily.  Why I do not know.  This puts pres=
sure on the seals back and front, which suggests it may be beneficial to ho=
ld both seals in with small screws to prevent them getting pushed out.  Scr=
ews are good insurance as in flight a detached seal could ruin a good day.
> >=20
> >         Neil.
> >=20
> >         =20
> >=20
> >     >=20

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<!doctype html>
<html>
 <head>=20
  <meta charset=3D"UTF-8">=20
 </head>
 <body>
  <div style=3D"font-size: 12pt; font-family: helvetica,arial,sans-serif; c=
olor: #333333;">
   <span style=3D"font-family: helvetica; font-size: 12pt;">Hello Steve, so=
 if the line pressure oil is pushing out the air into eng. oil pan, the gea=
rbox is eventually all oil, no air so no more aeration of the oil, right.&n=
bsp; &nbsp; &nbsp; &nbsp; David R. Cook&nbsp; &nbsp;Holt MI&nbsp; &nbsp; RV=
6A Rotary&nbsp;</span>
  </div>=20
  <blockquote type=3D"cite">=20
   <div>
    On 04/30/2021 2:00 AM Sboese sboese@uwyo.edu &lt;flyrotary@lancaironlin=
e.net&gt; wrote:
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div>
    &nbsp;
   </div> Neil,=20
   <div>
    &nbsp;
   </div>=20
   <div>
    With a -6 drain line to the crankcase, air that was initially inside th=
e gearbox is mixed with the oil and this mixture is forced out the drain by=
 an equal volume of pure oil coming in. &nbsp;Eventually all the air is eli=
minated and the gearbox is completely filled with oil. &nbsp;An RD (Tracy C=
rook) redrive fitted with a -10 (5/8=E2=80=9D) id drain and a vent from the=
 upper part of the redrive to the upper part of the crankcase will not fill=
 up with oil and only have crankcase pressure inside.
   </div>=20
   <div>
    &nbsp;
   </div>=20
   <div>
    Steve Boese&nbsp;
    <br>=20
    <div dir=3D"ltr">
     <br>=20
     <blockquote type=3D"cite">
      On Apr 29, 2021, at 4:25 PM, flyrotary@lancaironline.net wrote:
      <br>
      <br>
     </blockquote>=20
    </div>=20
    <blockquote type=3D"cite">=20
     <div dir=3D"ltr">=20
      <div style=3D"border: solid red 2.25pt; padding: 1.0pt 4.0pt 1.0pt 4.=
0pt;">=20
       <p class=3D"MsoNormal" style=3D"line-height: 11.35pt;">=E2=97=86 Thi=
s message was sent from a non-UWYO address. Please exercise caution when cl=
icking links or opening attachments from external sources.</p>=20
      </div>=20
      <br>=20
      <div>=20
       <div class=3D"WordSection1">=20
        <p class=3D"MsoNormal">Mat,</p>=20
        <p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Oil into the redrive is need=
ed mainly for lubrication and also heat transfer.&nbsp; Very little is need=
ed as lubrication needs little with oils these days.&nbsp; It appears that =
In most cases the redrive actually fills and does not drain readily.&nbsp; =
Why I do not know.&nbsp; This puts pressure on the seals back and front, wh=
ich suggests it may be beneficial to hold both seals in with small screws t=
o prevent them getting pushed out.&nbsp; Screws are good insurance as in fl=
ight a detached seal could ruin a good day.</p>=20
        <p class=3D"MsoNormal">Neil.</p>=20
        <p class=3D"MsoNormal">&nbsp;</p>=20
       </div>=20
      </div>=20
     </div>=20
    </blockquote>=20
   </div>=20
  </blockquote>=20
 </body>
</html>
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