From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] RD-1C input shaft oil seal
Date: Fri, 5 Mar 2021 06:28:32 +0800
References: <list-1277212@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-1277212@logan.com>
Message-Id: <9C55FF9E-B8B0-4FB6-B8BA-C2F1A823D7D3@gmail.com>

Thanks Steve
So to reduce the oil in the drive reducing pressure and possibly extra =
heat, required both enlarging the rear bottom drain and adding a =
breather to the top of the drive.

Steve Izett


> On 5 Mar 2021, at 3:19 am, Steven W. Boese SBoese@uwyo.edu =
<flyrotary@lancaironline.net> wrote:
>=20
> Both are possibilities.  See archive message 64583, Jan 13, 2019.
>=20
> Steve Boese
>=20
>> On Mar 4, 2021, at 12:51 AM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>=20
>> Whats the downside to the drive filling with oil?
>> Pressurising the beast and its seals?
>> Is there more frictional losses and heat?
>>=20
>> Steve Izett
>>=20
>>> On 4 Mar 2021, at 2:35 pm, Sboese sboese@uwyo.edu =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> Finn,
>>>=20
>>> When I installed a vent in the top of my RD-1C drive it acted as an =
additional drain.  The drive operated completely filled with oil until =
the size of the original rear drain was increased to an ID of ~5/8=E2=80=9D=
 (1/2=E2=80=9D NPT pipe).
>>>=20
>>> Steve Boese=20
>=20
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