Rich,
The flexible part consists of a plate, a center drive block, and
a 2 inch metal square welded into the plate. The drive block is
vulcanised into the square tube which involves chemical cleaning
for the rubber to adhere perfectly. Then the plate has to be
lathed true to the center drive splined block to eliminate any
"walking" of the mounting plate. The plate must be true to the
center of the drive block. All this is done when you buy the
plate and then just need the alloy spacer to bolt all together.
Should the rubber begin to fail, the unit can be cleaned up and
revulcanised, but the rubber company would need the jig to do that
(or you make one yourself for them). I would think that an
exchange system is where we will end up. Vulcanizing costs alone
are $100 (AUD), so suspect that exchange costs may be $150 USD
with freight, or you can get it done yourself. Again you need a
jig to machine the mounting plate true to the drive block once
vulcanised. This is a slow job as you are now attempting to
machine a flexible rubber coupling, so slow and steady is the only
way. Again a jig is not hard to make especially with freight
costs these days.
Neil.
It looks like a great solution for
flexplateopathy.
What is involved in replacing the flexible part
of this coupling?
thanks
Rich
In a message dated 11/7/2018 2:02:24 PM Central Standard Time,
flyrotary@lancaironline.net writes:
joe,
Just unbolt the old flex drive, and bolt
mine on.
Neil Unger.
On 11/7/2018 9:10 PM, Joseph Berki jskmberki@windstream.net
wrote:
> Neil,
>
> Are there any modifications to the RD-1C hardware
using your solution?
>
> Joe Berki
>
> -----Original Message-----
> From: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Tuesday, November 6, 2018 8:02 PM
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Flexplare Replacement
>
> Marc,
>
> Attached photo is of the original mounted on my
engine, The unit shown has urethane as the "flex" which
lasted about 5 hours and the spacer is the original
without excess material milled off for lightness. Input
shaft is Tracy's whereas mine is one piece and a lot
dearer!! Basically as shown the plate with the vulcanised
drive block is bolted through the spacer and flexplate
onto the e shaft as shown and is lighter than Tracy's but
by how much I forget. Made specifically to retrofit all
Tracy's reduction drives.
>
> Neil Unger.
>
>
> On 11/7/2018 10:12 AM, Marc Wiese cardmarc@charter.net wrote:
>> Neil,
>> Can I see a sketch of how it all fits together
front to back?
>> Marc
>>
>> -----Original Message-----
>> From: Rotary motors in aircraft <flyrotary@lancaironline.net>
>> Sent: Tuesday, November 06, 2018 3:28 PM
>> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
>> Subject: [FlyRotary] Re: Flexplare Replacement
>>
>> Joe, There is another way which is my cushion
drive (attached) which will cost approx $500 USD plus
freight with the current exchange rate. Main cost is the
splined drive block so that it matches up with Tracy's
splined input shaft. The photo shows the 2 parts of the
unit, spacer and splined cushion drive, which bolt direct
onto the e shaft with the normal flexplate in between.
Uses the normal flexplate with no strain whatever on the
flexplate. Your money and your decision!!
>>
>> Neil Unger
>>
>>
>> On 11/7/2018 6:06 AM, Jeff Whaley jwhaley@datacast.com wrote:
>>> Hi Joe, I believe there are two ways you can
go, though I don't have part numbers or exact details for
you:
>>> 1) Tracy's Method: Use an aluminum flywheel
directly, including the center spline coupling - this
eliminates the damper plate and the need to drill holes.
The catch is the spline does not match the original RD1-C
prop shaft spline.
>>> 2) Dave Leonard's Method: Use an aluminum
flywheel, no center spline, mount the damper plate, remove
material from one face to adjust ring gear position
relative to starter.
>>> A quick search of the list should get you
more info as it was discussed lately ...
>>> Jeff
>>>
>>> I have been looking at various flywheels for
possible candidate replacement.
>>>
>>> I thought the aluminum units would provide
the least amount of weight gain.
>>>
>>> I noticed that there are a lot of holes in
these units including the replaceable friction area with
many screw holes.
>>>
>>> I was under the impression that the holes in
the flexplate promoted stress cracks.
>>>
>>> These flywheels however may have sufficient
material to counteract the stress potential.
>>>
>>> Can someone provide a brand or part number
that is acceptable?
>>>
>>> I believe that the additional machining to
modify one of these flywheels is the holes for the
torsional damper.
>>>
>>> Thanks for any help.
>>>
>>>
>>>
>>> Joe Berki
>>>
>>> --
>>> Homepage: http://www.flyrotary.com/
>>> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>
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>
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