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: Sat, 24 Oct 2020 07:17:27 +0800
References: <list-869471@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-869471@logan.com>
Message-Id: <2FF19AF1-CF13-47DE-A195-4CC6BB3F7417@gmail.com>

Thanks guys. Appreciated.

As far as the MT I=E2=80=99m looking at, I=E2=80=99ll need to reduce the =
spinner diameter from 13 inch to 12 inch. Id this likely to present =
problems or substantive cost?

Steve

> On 24 Oct 2020, at 12:47 am, Charlie England ceengland7@gmail.com =
<flyrotary@lancaironline.net> wrote:
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> =46rom Bobby:
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> Deployed a new exchange server this week and can=E2=80=99t post.
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> =20
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> Flange is SAE-2 And will need  new bushings / drive lugs for an MT =
prop.  I don=E2=80=99t remember how many of the bolts are drive lugs.
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> =20
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> =20
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> Bobby
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> On Fri, Oct 23, 2020 at 11:29 AM Charlie England ceengland7@gmail.com =
<flyrotary@lancaironline.net> wrote:
> It would be a good idea to verify the bushing outside diameter for =
that particular model, and also verify whether all 6 bushings can remain =
in place. Some Hartzell constant speed props only have counterbores for =
4 out of the 6 bushings. Perhaps Bobby can tell you whether the MT props =
do the same thing. For an example, see this link:
> http://mstewart.net/super8/propclock/index.htm
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> Charlie
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> On Fri, Oct 23, 2020 at 10:46 AM Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
> Thanks Charlie
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> 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.
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> 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.
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> Thanks
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> Steve
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> > 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.
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> > 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.
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> > I know that Mark S and Bobby modified their hubs to the larger =
bushings/bolts, to fit their MT electric props.
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> > Bolt circle diameter is the same for all bolt sizes; 320s & 360s.
> >=20
> > Charlie
> >=20
> > --=20
> > This email has been checked for viruses by Avast antivirus software.
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> >=20
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