From: "Jeff Whaley jwhaley@datacast.com" <flyrotary@lancaironline.net>
Received-SPF: none
 receiver=logan.com; client-ip=40.107.81.79; envelope-from=jwhaley@datacast.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RE: Flexplare Replacement
Thread-Topic: Flexplare Replacement
Thread-Index: AQHUdgPTB651nxGsMUOYKrCG5EGLJQ==
Date: Tue, 6 Nov 2018 19:06:30 +0000
Message-ID:
 <CY4PR18MB14642CAB4A0E47FC35952550C4CB0@CY4PR18MB1464.namprd18.prod.outlook.com>
References: <listdigest-11846925@logan.com>
In-Reply-To: <listdigest-11846925@logan.com>
Accept-Language: en-US
Content-Language: en-US
received-spf: None (protection.outlook.com: datacast.com does not designate
 permitted sender hosts)
spamdiagnosticoutput: 1:99
spamdiagnosticmetadata: NSPM
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-CrossTenant-Network-Message-Id: cd2d338b-18e1-471e-c6bb-08d6441af5cd
X-MS-Exchange-CrossTenant-originalarrivaltime: 06 Nov 2018 19:06:30.1504
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: a07f70c7-0440-4b97-b25f-a93dca3f0980
X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR18MB1286

Hi Joe, I believe there are two ways you can go, though I don't have part n=
umbers or exact details for you:
1) Tracy's Method: Use an aluminum flywheel directly, including the center =
spline coupling - this eliminates the damper plate and the need to drill ho=
les. The catch is the spline does not match the original RD1-C prop shaft s=
pline.
2) Dave Leonard's Method: Use an aluminum flywheel, no center spline, mount=
 the damper plate, remove material from one face to adjust ring gear positi=
on relative to starter.
A quick search of the list should get you more info as it was discussed lat=
ely ...=20
Jeff

I have been looking at various flywheels for possible candidate replacement=
.

I thought the aluminum units would provide the least amount of weight gain.

I noticed that there are a lot of holes in these units including the replac=
eable friction area with many screw holes.

I was under the impression that the holes in the flexplate promoted stress =
cracks.

These flywheels however may have sufficient material to counteract the stre=
ss potential.

Can someone provide a brand or part number that is acceptable?

I believe that the additional machining to modify one of these flywheels is=
 the holes for the torsional damper.

Thanks for any help.

=20

Joe Berki