From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] RD1-C flange type and bolt size
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Message-ID: <edac1fe8-8bce-e0ed-d288-2be7a750b286@gmail.com>
Date: Fri, 23 Oct 2020 10:33:09 -0500
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On 10/23/2020 10:13 AM, Stephen Izett stephen.izett@gmail.com wrote:
> Hi Guys
>
> I’m 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?
>
> Cheers
>
> Steve Izett
> Glasair SIISRG Renesis 4 port RD1-C
>
Tracy's flange in stock condition uses 3/8" dia bolts. The bushings 
(drive lugs) are 5/8" in diameter.

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.

I know that Mark S and Bobby modified their hubs to the larger 
bushings/bolts, to fit their MT electric props.

Bolt circle diameter is the same for all bolt sizes; 320s & 360s.

Charlie

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