From: "Sboese sboese@uwyo.edu" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: [FlyRotary]: RD-1C input shaft oil seal ... Drain Hole question for Steve B.
Date: Fri, 5 Mar 2021 10:22:59 -0700
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Jeff,

The supply lines to my redrives are AN4.  The oil flow rate is restricted i=
nternally by the construction of the redrive.  Without a vent, the air init=
ially inside the unit is entrained in the oil primarily by the action of th=
e gears, the air is eliminated through the drain, and the unit is quickly c=
ompletely filled with oil. This happens regardless of the size of the drain=
. At this point, the oil out flow rate must equal the oil in flow rate.  Th=
e size of the drain limits the internal pressure of the unit.  The larger s=
ize drain allows the oil to be removed by gravity alone and prevents the oi=
l from coming out of the added vent.  With the vent connected to the engine=
 crankcase above the oil level, the pressure inside the redrive is now the =
same as the pressure inside the crankcase.

Steve Boese=20

> On Mar 5, 2021, at 5:51 AM, Jeff Whaley jwhaley@datacast.com <flyrotary@l=
ancaironline.net> wrote:
>=20
> =EF=BB=BF=E2=97=86 This message was sent from a non-UWYO address. Please =
exercise caution when clicking links or opening attachments from external s=
ources.
>=20
>=20
> Hi Steve B., with respect to your response about drain hole diameter ...
> What is the size of your oil inlet hose?
> Did you experiment with oil inlet size - if oil won't all come OUT perhap=
s we are putting too much IN?
> Just a thought.
> Jeff
>=20
> Finn,
>=20
> When I installed a vent in the top of my RD-1C drive it acted as an addit=
ional drain.  The drive operated completely filled with oil until the size =
of the original rear drain was increased to an ID of ~5/8" (1/2" NPT pipe).
>=20
> Steve Boese
>=20
>=20
> --
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