From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] eliminate cushion drive
Date: Sat, 19 Dec 2020 14:04:28 +0800
Message-Id: <90E204BC-E362-46E6-921F-559E200538A5@gmail.com>
References: <list-1051210@logan.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>


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Thanks very much Neil.=20
A plan could be, should the RD1C spines parts strength be questionable, leav=
e it riveted to the 0.2inch thick aluminium damper plate. Cut/machine that p=
late down to the same circumference as the spined part, approx 5 inch, and D=
rill the 6 x 10mm holes and attach direct to the EShaft through the spacer m=
achined to correct size.
Steve Izett

Sent from my iPhone

> 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 mak=
es the outer edge of the bolts 108mm or 4.25 inches.    The OD measurement o=
f 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 an=
d 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 spline=
d plate has to be to clear the end of the E Shaft.  Again everything is poss=
ible 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 k=
now?
> Neil.

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Thanks very much Neil.&nbsp;<div>A plan cou=
ld be, should the RD1C spines parts strength be questionable, leave it rivet=
ed to the 0.2inch thick aluminium damper plate. Cut/machine that plate down t=
o 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 c=
orrect size.<div>Steve Izett<br><br><div dir=3D"ltr">Sent from my iPhone</di=
v><div dir=3D"ltr"><br><blockquote type=3D"cite">On 19 Dec 2020, at 6:42 am,=
 flyrotary@lancaironline.net wrote:<br><br></blockquote></div><blockquote ty=
pe=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"Content-Type" cont=
ent=3D"text/html; charset=3Dus-ascii"><meta name=3D"Generator" content=3D"Mi=
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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--><div class=3D"WordSection1"><p class=3D"Ms=
oNormal"><span lang=3D"EN-AU">Steve,<o:p></o:p></span></p><p class=3D"MsoNor=
mal"><span lang=3D"EN-AU">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Further to your measurements.&nbsp;=
 The centre to centre of the holes in the counterweight (E shaft)&nbsp; is 9=
8mm.&nbsp; Bolt size is 10mm which makes the outer edge of the bolts 108mm o=
r 4.25 inches.&nbsp;&nbsp;&nbsp; The OD measurement of my spacer is approx. 5=
 inches, so it would appear possible to mount tracy,s splined drive shaft pl=
ate direct to the E shaft with the 6 x 10mm bolts and spaced out with my spa=
cer which may have to be adjusted for height =E2=80=93 a simple lathe job.&n=
bsp; This as well known eliminates any =E2=80=98damping=E2=80=9D in the driv=
e line.<o:p></o:p></span></p><p class=3D"MsoNormal"><span lang=3D"EN-AU">&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; I do not have the measurements of just how high the splined plat=
e has to be to clear the end of the E Shaft.&nbsp; Again everything is possi=
ble with time and money!!<o:p></o:p></span></p><p class=3D"MsoNormal"><span l=
ang=3D"EN-AU">A&nbsp; question to the group --- What is the Splined drive pl=
ate made from?&nbsp; I thought it was simply a machined cast, but it has bee=
n suggested it is a =E2=80=9Csintered=E2=80=9D casting. (weaker than normal c=
asting) &nbsp;Does anyone know?<o:p></o:p></span></p><p class=3D"MsoNormal">=
<span lang=3D"EN-AU">Neil.<o:p></o:p></span></p></div></div></blockquote></d=
iv></div></body></html>=

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