From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] eliminate cushion drive
Date: Sun, 20 Dec 2020 17:10:21 +0800
References: <list-1054140@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-1054140@logan.com>
Message-Id: <16EC4EE2-0AA7-4653-839F-9F8D0D853732@gmail.com>

Hi 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

Steve

> 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-coupl=
ing-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.