From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] RD1-C flange type and bolt size
Date: Fri, 23 Oct 2020 23:45:41 +0800
References: <list-869250@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-Id: <B2C50DA2-058B-4538-B5C0-F3360307CCBF@gmail.com>

Thanks Charlie

I=E2=80=99m interested in a MTV-7-C 183-51 and wondered if it would fit =
the RD1-C flange.
My main reason is to increase the diameter out to 72inch to get =
increased prop tip speed.
When I ordered the RD1C all these years ago I didn=E2=80=99t understand =
that Tracy only recommended the C version for larger props.

The MT documentation suggests that a C version has SAE No. 2 mod. bolts =
7/16"-20 UNF
So sounds like you think it could fit with a change to the bushings.

Thanks

Steve


> On 23 Oct 2020, at 11:33 pm, Charlie England ceengland7@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> On 10/23/2020 10:13 AM, Stephen Izett stephen.izett@gmail.com wrote:
>> Hi Guys
>>=20
>> I=E2=80=99m considering a prop change and wanting to confirm the =
flange type on the RD1-C
>> Does anyone know the type of flange? and do most Lycoming 360 series =
engines have that same bolt pattern and flange dimension?
>>=20
>> Cheers
>>=20
>> Steve Izett
>> Glasair SIISRG Renesis 4 port RD1-C
>>=20
> Tracy's flange in stock condition uses 3/8" dia bolts. The bushings =
(drive lugs) are 5/8" in diameter.
>=20
> Most Lyc 360s I'm aware of use 1/2" bolts, and the bushings are 3/4" =
in diameter. Some Lyc 320s use 7/16" bolts with the same 5/8" bushing =
diameter; there may be some 360s using 7/16" bolts but I've never seen =
one.
>=20
> I know that Mark S and Bobby modified their hubs to the larger =
bushings/bolts, to fit their MT electric props.
>=20
> Bolt circle diameter is the same for all bolt sizes; 320s & 360s.
>=20
> Charlie
>=20
> --=20
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>=20
>=20
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