From: "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: eliminate cushion drive
Date: Sun, 20 Dec 2020 12:03:56 +0200
Message-Id: <DEF11356-B5B0-4FFA-ACD5-DB581F3F7120@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

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, s=
eems 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 t=
hem in Aluminium.
> I could find RPM limits.
> Cheers
>=20
> Steve
>=20
>> On 20 Dec 2020, at 1:04 pm, Le Roux Breytenbach breytenbachleroux@gmail.c=
om <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 <flyrot=
ary@lancaironline.net> wrote:
>>>=20
>>> =EF=BB=BFThanks very much Neil.=20
>>> A plan could be, should the RD1C spines parts strength be questionable, l=
eave it riveted to the 0.2inch thick aluminium damper plate. Cut/machine tha=
t plate down to the same circumference as the spined part, approx 5 inch, an=
d Drill the 6 x 10mm holes and attach direct to the EShaft through the space=
r 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 t=
he holes in the counterweight (E shaft)  is 98mm.  Bolt size is 10mm which m=
akes 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 trac=
y,s splined drive shaft plate direct to the E shaft with the 6 x 10mm bolts a=
nd 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 spli=
ned plate has to be to clear the end of the E Shaft.  Again everything is po=
ssible 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 anyo=
ne know?
>>>> Neil.
>=20
>=20
> --
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