X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) From: "Charlie England ceengland7@gmail.com" Received: from mail-io1-f51.google.com ([209.85.166.51] verified) by logan.com (CommuniGate Pro SMTP 6.2.14) with ESMTPS id 1055364 for flyrotary@lancaironline.net; Sun, 20 Dec 2020 14:07:06 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.166.51; envelope-from=ceengland7@gmail.com Received: by mail-io1-f51.google.com with SMTP id t8so6942148iov.8 for ; Sun, 20 Dec 2020 11:07:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language; bh=P9zzPXfWLIqI8WgGPxQcd4uKLeIiApyeaa3euWqju4s=; b=vAoNohKsl7S26Aft+SAQt9L5gqAzn6pVEZl6NUVSgS2jjiRVdE+u8B8J0KvWefCdWC Ktxws1ncnRemRqTDdhrXMkKtORG923FLTT+M9sj+VMetd1arfFnoQ+rJKLZx1S1tdc7t BOM/M+gXV53dPjBU07daYWXXXTOowuNWT7iKoHmarvnoN239j1ZA1Gay5ULCz5KWjOFZ kDxmctbGGrUziI4sooO9z9W4x+Wfz76n9E1emDgOqnTkNWYyZ0jg9hXtVsvsvYpjHIiU SIAJ0eY98Vbt7tDbbHcBcoMTQclmrN3reSS6OYKs0xO2vWt6PPcZXZgvTjEBQaMHbCel 1A8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language; bh=P9zzPXfWLIqI8WgGPxQcd4uKLeIiApyeaa3euWqju4s=; b=aujbfmAWugOnR03TX8tBztaKzxFMakh4xhudYn3EPQgLDMSVQ+asMRkqjJi68evkrU yXVKb7wn8nWFeRMjwrd0d/JoLEKh9+JI5wd1MrN9D6jQSsPrDnCsyX736geC7Es7S1xq 5hV29w+fbxqGyFsoA6fdkKmoxr/5fl0ZBTnsntMp04pxAPHiG1S+BFNLKZHC6TRyYttJ volA2HjbNdGpcIVLzzeY5QLFzeYbN62aSDX9jHIl1u85mdEAUSUkn0HVYmkxQEiKxU6I Hitvns2vwheMVK1feuou548Pyxhrk1n5O9O3JVTQS1BfX6ECGY5xfvYCmgpiZevTWsOA NvzQ== X-Gm-Message-State: AOAM531+gqncVGVyYdNGMClbXvNOLvXnfDXGM/0QEw95bSP5hic5JB99 a76CPtSCtsR6ZX53NemcZKj/Cjf7hNs= X-Google-Smtp-Source: ABdhPJxwGWq/kpinZMYjrcwyoivMRJ5U0RLfd0pYSNgPTnIC0cwMKOCBH6Y7S2Fje2sqxqa3HYJ/Iw== X-Received: by 2002:a02:354a:: with SMTP id y10mr12485786jae.126.1608491208948; Sun, 20 Dec 2020 11:06:48 -0800 (PST) Return-Path: Received: from ?IPv6:::1? ([2607:fb90:99bb:5870:20d9:fd11:e798:b2c2]) by smtp.googlemail.com with ESMTPSA id a10sm20891232ioc.43.2020.12.20.11.06.47 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 20 Dec 2020 11:06:48 -0800 (PST) Subject: Re: [FlyRotary] Re: eliminate cushion drive To: Rotary motors in aircraft References: Message-ID: <9f112939-345a-c82b-060c-42fc537496ce@gmail.com> Date: Sun, 20 Dec 2020 13:08:42 -0600 User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------6F153070630A05F2B1419970" Content-Language: en-US X-Antivirus: Avast (VPS 201220-2, 12/20/2020), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. --------------6F153070630A05F2B1419970 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit I wouldn't consider that design viable for a/c use; it is fail-failed, instead of fail-safe. The SGF, guibo, etc will still drive the output shaft (at least for a while) if the compliant parts fail. On 12/20/2020 12:42 PM, Ernest Christley echristley@att.net wrote: > A slightly different solution along the same lines, that is readily > available: > > https://www.mcmaster.com/flexible-couplings/high-speed-vibration-damping-flexible-shaft-couplings-9/ > > > On Sunday, December 20, 2020, 12:05:09 AM EST, Le Roux Breytenbach > breytenbachleroux@gmail.com 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 >> 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. >>> -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --------------6F153070630A05F2B1419970 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
I wouldn't consider that design viable for a/c use; it is fail-failed, instead of fail-safe. The SGF, guibo, etc will still drive the output shaft (at least for a while) if the compliant parts fail.

On 12/20/2020 12:42 PM, Ernest Christley echristley@att.net wrote:
A slightly different solution along the same lines, that is readily available:


On Sunday, December 20, 2020, 12:05:09 AM EST, 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.



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