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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:
Charlie
Thanks Charlie
I’m 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’t 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:
>
> 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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