X-CGP-ClamAV-Result: CLEAN X-VirusScanner: Niversoft's CGPClamav Helper v1.23.0 (ClamAV engine v0.103.0) X-Junk-Score: 0 [] X-KAS-Score: 0 [] From: "David Leonard wdleonard@gmail.com" Received: from mail-pj1-f50.google.com ([209.85.216.50] verified) by logan.com (CommuniGate Pro SMTP 6.3.5) with ESMTPS id 377135 for flyrotary@lancaironline.net; Wed, 20 Oct 2021 16:15:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.216.50; envelope-from=wdleonard@gmail.com Received: by mail-pj1-f50.google.com with SMTP id om14so3260649pjb.5 for ; Wed, 20 Oct 2021 13:15:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=JLP/92B3+I2EEBH+AC0cSEGYagXiBxOD0/p5BrHAjFA=; b=TKYJENspjVhXp+kCA2MSs2+EcFMzMbhOow8g+7MNnnkmn+CoowFyiOsT8yHNeQiWzj TjI+04ERn3ux0PvjjI7do1nAy4dYOF5e0Y7+4AAN/qiav1qHR7BLDuWY7t2zg8dFxzqa nNeNuqDMdH7uKOsPQcy8EPcUO4jyMBNfaxlOpwXjUJrXLgNSONCvA46PYV59rJGgCWfA RykrF/UG0HnWyPINhoLr/Ar/7rq4cR0Hk4A+2jbcm0XXiv03aPvAZlxwoECVkRqx2fI4 Eg1bdLXIlDts/eHVKdR1iohFSRmChfwQEZStJWS5plNfbXo6QgV1sDQS5jV2nuyEPT1H +PqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=JLP/92B3+I2EEBH+AC0cSEGYagXiBxOD0/p5BrHAjFA=; b=LhOVmDS2X5ffH2ZbrB2eyHenUVOspO5jOQvHeCK/0+E/7bJOTpBC6DgY+z8kaU/WVi DCg9CT/LmPVLBrp7KqvRjM4tWIgO+sEx1+ThyuW1AtH+Tm8JPGvLGCTAgAWCOSvIM9/z HypyiIy2r1Mzc0Nh33J3nWCxevkHzu38heHd+DCWBK4ARh9eaTKbVrUDYtxCcZm93rvr KDfL11uRdE8vkbDRCttO9z4bOR4mVuNW82buPE0C3+FOZFL8Se94u+ss46HvBjD0wJl+ htHwdMFND60hGnKazY5GKp76gAO5qC+9Wwjpa1EDweR1jnd5I+meUrCCrVS7Lg/XKdK9 euGg== X-Gm-Message-State: AOAM533KD4QrD+WykxwShhX1t+0O2yjOHl2NKKkxQ6BA3XjM4zjfjt5E WDQVNxLR57TvbudEGTD5/KT/jobo3XQLFclH2z3aIL4l X-Google-Smtp-Source: ABdhPJytED9f18g71nSkXJNBGMm2si5RJpSEYmhP6MC5pGwKj6MG1MmCSiqycgjaUeqJLFGQi1NfIhCD0+J5BBM88kc= X-Received: by 2002:a17:902:8bc4:b029:12b:8470:e29e with SMTP id r4-20020a1709028bc4b029012b8470e29emr1160244plo.2.1634760884087; Wed, 20 Oct 2021 13:14:44 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: Date: Wed, 20 Oct 2021 13:14:30 -0700 Message-ID: Subject: Re: [FlyRotary] Re: flex plate To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary="000000000000c9f0b605cece6da0" --000000000000c9f0b605cece6da0 Content-Type: text/plain; charset="UTF-8" Hi Charlie, The one I got was chromoly and weighed 22#, I am sure an aluminum one would work as well. The diameter of the ring and the number of teeth matched the flexplate, but it was closer to the engine by about a half inch. I had to mill off just enough of the mating surface so that Tracy's damper plate& spline socket could fit without hitting the back of the gearbox mounting plate. The CNC shop also reamed the bolt holes in the right place. The last job was to mill a depression in the RD-1B mounting plate so that the starter would reach the new location of the starter teeth. I figured a few extra pounds in the flywheel could only help smooth out the engine. There is one nice thing about Tracys approach to vibrational harmonics. He designed it with ample gear lash so it seems to me that increasing the weight of the flywheel would be unlikely to worsen harmonics. Otherwise, with a tight system I would not be as confident. Didn't we all decide that the issue with many other PSRU's was vibrational harmonics. Didnt the Ross, Powersport, and Eigenfelner have this problem? I have had many problems with my early design RD-1B, but never a problem with the planetary gears themselves. Anyway, I do recall there is a difference between some of the different flywheels between RX-7 generations but I can't recall which years the ring size matches the flexplate we use. Dave Leonard > > > Do you remember what that flywheel weighs? Was it the same diameter as the > flex plate, or was it smaller, like the non-turbo manual trans flywheels? > Did you remove all the disk mating surface to reduce weight, or just enough > to mount the damper plate? > > I've got an aluminum manual trans flywheel on the shelf, but it's slightly > smaller in dia than the flexplate. Wondering about weight comparisons, > mounting, etc. > > In more general terms, the flexplates seem to have a rather checkered past > even in the car. I've got one that came off the car cracked. > > Charlie > > On 10/19/2021 11:15 AM, David Leonard wdleonard@gmail.com wrote: > > I used one of these: > > https://throtl.com/products/act-xact-streetlite-flywheels-act600145?cq_src=google_ads&cq_cmp=10870770605&cq_term=&cq_med=&cq_plt=gp&gclid=CjwKCAjw2bmLBhBREiwAZ6ugo8jSPo2ktPDdU8xZsTdN80Wbg0xZNiX6JQWuXpJkC7J3DV5b8bs6xRoCeroQAvD_BwE > I mounted the RWS damper plate. I had to take it to a CNC shop to take > down the face and locate the mounting holes. I also had to modify the > mounting of the starter, but it was a pretty easy job. > > Neil, great job on getting your gear-box into production. We sure need it. > > Dave Leonard > > On Sat, Oct 16, 2021 at 3:48 PM Pam & Dave Williams padajute@idcnet.com < > flyrotary@lancaironline.net> wrote: > >> Hello James, >> >> >> >> I have a stock 13b ( estimated 150 hp) with RWS equipment. I used a >> racing aluminum flywheel and removed the steel clutch facing. Then I >> resized the RWS splined hub to fit. Basically I copied RWS by making a new >> plate and riveting on the RWS splined hub to my new plate. Because the new >> plate is a smaller OD I used 6 bolts instead of 4. I used the same >> durometer rubber cushions. >> >> >> >> Thanks, >> >> Dave Williams >> >> >> >> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] >> *Sent:* Friday, October 15, 2021 6:27 PM >> *To:* Rotary motors in aircraft >> *Subject:* [FlyRotary] Re: flex plate >> >> >> >> Dave, do you have a recommendation for a lightweight flywheel and >> flexplate/ damper (brand or type) for a 250hp 13b? Thanks, James Whitehurst >> >> >> >> On Fri, Oct 15, 2021, 12:27 David Leonard wdleonard@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >> But you should know that those are prone to cracking, and I had a >> catastrophic failure of one. They were never designed to carry the output >> load of the engine, just as a way to engage the starter. Tracey published >> a revision in the archives, or you can convert a manual fly wheel to work. >> I suggest lightweight aftermarket versions. >> >> >> >> Dave Leonard >> >> >> >> On Thu, Oct 14, 2021 at 2:09 PM 12348ung@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >> Thought so, thanks >> >> >> >> *From:* Rotary motors in aircraft >> *Sent:* Friday, October 15, 2021 8:06 AM >> *To:* Rotary motors in aircraft >> *Subject:* [FlyRotary] Re: flex plate >> >> >> >> AUTOMATIC >> >> >> >> On Thu, Oct 14, 2021, 4:04 PM 12348ung@gmail.com < >> flyrotary@lancaironline.net> wrote: >> >> Can anyone confirm which flex plate fits the RWS redrive? I believe it >> comes from a 92 model RX7. But is it from an automatic, manual or turbo >> model? All are different apparently. >> >> Thanks Neil. >> >> > > > Virus-free. > www.avast.com > > <#m_1233803227963876889_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > --000000000000c9f0b605cece6da0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Charlie,
The one I got was chromoly and = weighed 22#,=C2=A0 I am sure an aluminum one would work as well.=C2=A0 The = diameter of the ring and the number of teeth matched the flexplate, but it = was closer to the engine by about a half inch.=C2=A0 I had to mill off just= enough of the mating=C2=A0surface so that Tracy's damper plate&=C2= =A0spline socket could fit without hitting the back of the gearbox mounting= plate.=C2=A0 =C2=A0The CNC shop also reamed the bolt holes in the right pl= ace.=C2=A0 =C2=A0 The last job was to mill a depression in the RD-1B mounti= ng plate so that the starter would reach the new location of the starter te= eth.=C2=A0 I figured a few extra pounds in the flywheel could only help smo= oth out the engine.=C2=A0=C2=A0

There is one nice = thing about Tracys approach to vibrational harmonics.=C2=A0 He designed it = with ample gear lash so it seems to me that increasing the weight of the fl= ywheel would be unlikely to worsen harmonics.=C2=A0 Otherwise, with a tight= system I would not be as confident.=C2=A0 Didn't=C2=A0we all decide th= at the issue with many other PSRU's was vibrational harmonics.=C2=A0 Di= dnt the Ross, Powersport, and Eigenfelner have this problem?=C2=A0 I have h= ad many problems with my early design RD-1B, but never a problem with the p= lanetary=C2=A0gears themselves.

Anyway, I do recal= l there is a difference between some of the different flywheels between RX-= 7 generations but I can't=C2=A0recall which years the ring size matches= the flexplate we use.

Dave Leonard




Do you remember what that flywheel weighs? Was it the same diameter as the flex plate, or was it smaller, like the non-turbo manual trans flywheels? Did you remove all the disk mating surface to reduce weight, or just enough to mount the damper plate?

I've got an aluminum manual trans flywheel on the shelf, but it&#= 39;s slightly smaller in dia than the flexplate. Wondering about weight comparisons, mounting, etc.

In more general terms, the flexplates seem to have a rather checkered past even in the car. I've got one that came off the ca= r cracked.

Charlie

On 10/19/2021 11:15 AM, David Leonard wdleonard@gmail.com wrote:
=20
I used one of these:
I mounted the RWS damper plate.=C2=A0 I had to take it to a CN= C shop to take down the face and locate the mounting holes.=C2=A0 I also had to modify the mounting of the starter, but it was a pretty easy job.

Neil, great job on getting your gear-box into production.=C2= =A0 We sure need it.

Dave Leonard

On Sat, Oct 16, 2021 at 3:48 PM Pam & Dave Williams padajute@idcnet.com <flyrotary@lancaironline.net> wrote:

Hello James,

=C2=A0

I have a stock 13b ( estimated 150 hp) with RWS equipment. I used a racing aluminum flywheel and removed the steel clutch facing. Then I resized the RWS splined hub to fit. Basically I copied RWS by making a new plate and riveting on the RWS splined hub to my new plate. Because the new plate is a smaller OD I used 6 bolts instead of 4. I used the same durometer rubber cushions.

=C2=A0

Thanks,

Dave Williams

=C2=A0

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
Sent: Friday, October 15, 2021 6:27 PM
To: Rotary motors in aircraft <flyrotary@lancaironline.ne= t>
Subject: [FlyRotary] Re: flex plate

=C2=A0

Dave, do you have a recommendation for a lightweight flywheel and flexplate/ damper (brand or type) for a 250hp 13b? Thanks, James Whitehurst

=C2=A0

On Fri, Oct 15, 2021, 12:27 David Leonard wdleonard@gmail.com <flyrotary@lancaironline.net> wrote:

But you should know that those are prone to cracking, and I had a catastrophic failure of one.=C2=A0 They were never designed to car= ry the output load of the engine, just as a way to engage the starter.=C2=A0 Tracey published a revision in the archives, or you can convert a manual fly wheel to work.=C2=A0 I suggest lightweight aftermarke= t versions.

=C2=A0

Dave Leonard

=C2=A0

On Thu, Oct 14, 2021 at 2:09 PM 12348ung@gmail.com <flyrotary@lancaironline.net> wrote:

Thoug= ht so, thanks

=C2= =A0

From: Rotary motors in aircraft <flyrotary@lancaironline.net&= gt;
Sent: Friday, October 15, 2021 8:06 AM
To: Rotary motors in aircraft <flyrotary@lanc= aironline.net>
Subject: [FlyRotary] Re: flex plate

=C2=A0

AUTOMATIC

=C2=A0

On Thu, Oct 14, 2021, 4:04 PM 12348ung@gmail.com <flyrotary@lancaironline.net> wrote:

Can anyone confirm which flex plate fits the RWS redrive?=C2=A0 I believe it comes fro= m a 92 model RX7. But is it from an automatic, manual or turbo model?=C2= =A0 All are different apparently.<= /p>

Thanks=C2=A0 Neil.



3D"" Virus-free. www.avast.com=
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