From: " 12348ung@gmail.com" <flyrotary@lancaironline.net>
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Subject: RE: [FlyRotary] Re: eliminate cushion drive
Date: Mon, 21 Dec 2020 07:38:02 +1100
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Le Roux,
                    Have looked at similar many times, but once you get =
over 5000 RPM centrifugal force does many things that are not helpful.  =
Then size is a problem, we do not have much room to fit any drive. =20
Thanks,  Neil.

-----Original Message-----
From: Rotary motors in aircraft <flyrotary@lancaironline.net>=20
Sent: Sunday, December 20, 2020 9:04 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: eliminate cushion drive

Must admit that i did not look all the specs up.
But the design and the material that the rubber dampner itself is made =
of, seems good and strong with new technology in the rubber casting.

Le Roux

Sent from my iPhone
Le Roux Breytenbach=20

> On 20 Dec 2020, at 11:11, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> =EF=BB=BFHi Le Roux.
> The weight of their units looks to be a problem unless you could =
replace them in Aluminium.
> I could find RPM limits.
> Cheers
>=20
> Steve
>=20
>> On 20 Dec 2020, at 1:04 pm, Le Roux Breytenbach =
breytenbachleroux@gmail.com <flyrotary@lancaironline.net> wrote:
>>=20
>> For interest :
>>=20
>> Come across this flex-coupling interesting that it is design to =
connect a flywheel to a output shaft.
>>=20
>> High speed up to 3500 - 7500 rpm =20
>> 210 nm - 3240 nm
>>=20
>> =
https://pdf.directindustry.com/pdf/sgf-gmbh-co-kg/sgf-sgflex-3f-flex-coup=
ling-assembly-us/34796-787217.html#open
>>=20
>>=20
>> Sent from my iPhone
>> Le Roux Breytenbach=20
>>=20
>>>> On 19 Dec 2020, at 08:05, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> =EF=BB=BFThanks very much Neil.=20
>>> A plan could be, should the RD1C spines parts strength be =
questionable, leave it riveted to the 0.2inch thick aluminium damper =
plate. Cut/machine that plate down to the same circumference as the =
spined part, approx 5 inch, and Drill the 6 x 10mm holes and attach =
direct to the EShaft through the spacer machined to correct size.
>>> Steve Izett
>>>=20
>>> Sent from my iPhone
>>>=20
>>>> On 19 Dec 2020, at 6:42 am, flyrotary@lancaironline.net wrote:
>>>>=20
>>>> =EF=BB=BF
>>>> Steve,
>>>>                Further to your measurements.  The centre to centre =
of the holes in the counterweight (E shaft)  is 98mm.  Bolt size is 10mm =
which makes the outer edge of the bolts 108mm or 4.25 inches.    The OD =
measurement of my spacer is approx. 5 inches, so it would appear =
possible to mount tracy,s splined drive shaft plate direct to the E =
shaft with the 6 x 10mm bolts and spaced out with my spacer which may =
have to be adjusted for height =E2=80=93 a simple lathe job.  This as =
well known eliminates any =E2=80=98damping=E2=80=9D in the drive line.
>>>>                I do not have the measurements of just how high the =
splined plate has to be to clear the end of the E Shaft.  Again =
everything is possible with time and money!!
>>>> A  question to the group --- What is the Splined drive plate made =
from?  I thought it was simply a machined cast, but it has been =
suggested it is a =E2=80=9Csintered=E2=80=9D casting. (weaker than =
normal casting)  Does anyone know?
>>>> Neil.
>=20
>=20
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