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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. Thanks, Neil. -----Original Message----- From: Rotary motors in aircraft <flyrotary@lancaironline.net> 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 > On 20 Dec 2020, at 11:11, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote: > > 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: >> >> For interest : >> >> Come across this flex-coupling interesting that it is design to connect a flywheel to a output shaft. >> >> High speed up to 3500 - 7500 rpm >> 210 nm - 3240 nm >> >> https://pdf.directindustry.com/pdf/sgf-gmbh-co-kg/sgf-sgflex-3f-flex-coupling-assembly-us/34796-787217.html#open >> >> >> Sent from my iPhone >> Le Roux Breytenbach >> >>>> On 19 Dec 2020, at 08:05, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote: >>> >>> Thanks very much Neil. >>> 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 >>> >>> Sent from my iPhone >>> >>>> On 19 Dec 2020, at 6:42 am, flyrotary@lancaironline.net wrote: >>>> >>>> >>>> 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 – a simple lathe job. This as well known eliminates any ‘damping” 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 “sintered” casting. (weaker than normal casting) Does anyone know? >>>> Neil. > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html