X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m14.mx.aol.com ([64.12.138.204] verified) by logan.com (CommuniGate Pro SMTP 5.1.1) with ESMTP id 1518980 for flyrotary@lancaironline.net; Wed, 01 Nov 2006 01:41:58 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.138.204; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m14.mx.aol.com (mail_out_v38_r7.6.) id q.cd9.1bde038 (40521) for ; Wed, 1 Nov 2006 01:41:32 -0500 (EST) From: Lehanover@aol.com Message-ID: Date: Wed, 1 Nov 2006 01:41:32 EST Subject: Re: [FlyRotary] Re: Flywheel machining and minimum inertia To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1162363292" X-Mailer: 9.0 Security Edition for Windows sub 5331 X-Spam-Flag: NO -------------------------------1162363292 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 11/1/2006 12:16:46 A.M. Eastern Standard Time, cbeazley@innovista.net writes: Thanks Lynn. Interesting stories as always. Do you know any sources for 7.25'' (or 5.5") ring gears and lightweight starters that will mesh? Cheers Cary The numbers are clutch disc diameters. The 7 1/4" is a common size for street and racing. The 5 1/2" is racing only with metal or carbon friction surfaces, and tend to be grabby. More like a switch. Note that many cars spin the wheels on standing starts. With low time drivers stalling the car. A very difficult skill to develop. Plus the clutch pedal has a very short throw with a mechanical stop to prevent the coaxial throw-out bearing from damaging the clutch spring. A 4 1/2" or 5 1/2" cover has very little movement from fully released to locked up solid. The ring gear is mounted on a special built aluminum plate machined to fit tabs on the button flywheel. Same as the cover diameter, about 6 1/2" diameter. The spare is just the stock automatic trans flex plate. I use the smaller of the two top mounted starters from the 70s. It is too heavy for aircraft use, but is still available from Auto zone, overnight only. There are a number of very light reduction gear starters that can be mounted, depending on what mounting system you plan to use. Only turning direction must be maintained. A perfect gear match with the ring gear is not required. Tilton has a very large selection. And I would want a piece that is available from Auto zone or another national chain. I would get samples from a scrap yard if you have an unusual layout. This has been done by many already, and on other building sites if you ask about it. So, for example, a starter from a 99 Toyota Corolla might be a better choice than one from a 51 Fairthorp Electron Minor. There are two flex plate diameters. The early smaller diameter RX-2 and 3 and the later RX-4 and Cosmo. Which one is correct I don't know. They are getting very hard to find. If you find one hang on to it. Also there are many American car flex plates that could be modified to work, with very close to the correct diameter. I have a BD-4 kit but am nowhere far enough along to need the data. Lynn E. Hanover -------------------------------1162363292 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 11/1/2006 12:16:46 A.M. Eastern Standard Time,=20 cbeazley@innovista.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Thanks=20 Lynn.
Interesting stories as always.
Do you know any sources for 7.2= 5''=20 (or 5.5") ring gears and lightweight
starters that will=20 mesh?

Cheers
Cary

The numbers are clutch disc diameters. The 7 1/4" is a common size= for=20 street and racing. The 5 1/2" is racing only with metal or carbon friction=20 surfaces, and tend to be grabby. More like a switch. Note that many cars spi= n=20 the wheels on standing starts. With low time drivers stalling the car. A ver= y=20 difficult skill to develop. Plus the clutch pedal has a very short throw wit= h a=20 mechanical stop to prevent the coaxial throw-out bearing from damaging the=20 clutch spring.

A 4 1/2" or 5 1/2" cover has very little movement from fully released t= o=20 locked up solid.

The ring gear is mounted on a special built aluminum plate machined to=20= fit=20 tabs on the button flywheel. Same as the cover diameter, about 6 1/2" diamet= er.=20 The spare is just the stock automatic trans flex plate. I use the small= er=20 of the two top mounted starters from the 70s. It is too heavy for aircraft u= se,=20 but is still available from Auto zone, overnight only.

There are a number of very light reduction gear starters that can be=20 mounted, depending on what mounting system you plan to use. Only turning=20 direction must be maintained. A perfect gear match with the ring gear is not= =20 required. Tilton has a very large selection. And I would want a piece that i= s=20 available from Auto zone or another national chain. I would get samples from= a=20 scrap yard if you have an unusual layout. This has been done by many already= ,=20 and on other building sites if you ask about it. So, for example, a=20 starter from a 99 Toyota Corolla might be a better choice than one from a 51= =20 Fairthorp Electron Minor.

There are two flex plate diameters. The early smaller diameter RX-2 and= 3=20 and the later RX-4 and Cosmo. Which one is correct I don't know. They=20= are=20 getting very hard to find. If you find one hang on to it. Also there are man= y=20 American car flex plates that could be modified to work, with very close to=20= the=20 correct diameter. I have a BD-4 kit but am nowhere far enough along to need=20= the=20 data.

Lynn E. Hanover

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