From: "Kelly Troyer keltro@gmail.com" <flyrotary@lancaironline.net>
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Date: Sun, 2 Aug 2020 23:52:49 -0500
Message-ID: <CAKEmuZ9J=60Qzrbjz+UG53xBKStcqmpa6TLvQmGfEgPhmD5Hww@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Aviation Specific 13B/20B Mazda Front Side Housing-pics
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On Sun, Aug 2, 2020 at 7:22 PM Charlie England ceengland7@gmail.com <
flyrotary@lancaironline.net> wrote:

> On 8/2/2020 5:52 PM, Kelly Troyer keltro@gmail.com wrote:
> > Group,
> >   As stated in a previous  E mail I have photos of a junk lycoming I/O
> > 540 crankcase with the "Dyna 1" mount ring as used by the "Vans" RV10
> > bolted to
> > the top mount "Ears"............I machined a wooden plug to fit the
> > the Lycoming rear crankshaft bearing journal and the outer portion of
> > the plug to fit the
> > " ID " of the RX8 Renesis front cover seal area...........This was to
> > show if the Renesis cover would fit within the confines of the
> > Lycoming I/O 540 mount
> > ring................It fits very well with only the stock Renesis
> > alternator mount (top of the waterpump portion of the cover) needing
> > to be removed and the
> > alternator relocated........These photos are too large to go
> > through the forum but I can send them to any of the group that may
> > want to see them via your
> > personal E mail address.............Just let me know..........
> >
> > Best,
> > Kelly troyer
> >
> >
> Hi Kelly,
>
> Is the 540 mount ring the same diameter as the 320/360 ring? If not,
> it's not going to help most people who are running 2 rotor engines. If
> you need a measurement on the mount for the smaller engines, I've got
> one hanging in the hangar.
>
> BTW, for the 320/360 engines, the type 2 mount is pretty rare. IIRC, it
> was only used on some light twins and maybe a single or two, that used
> an extended hub constant speed prop.
>
> Which brings up a point that is significant to me. As I mentioned
> earlier, the dyna mount is intended to converge the mounting bolt angles
> at the cg of the engine/prop combination in order for it to be truly
> effective.  It also requires quite expensive mount 'rubbers'. I've flown
> a significant number of hours behind both dyna and 'conical' (straight
> mount) Lyc engines, and the dyna is honestly not worth the extra
> $300-$400 expense. On a rotary, the value should be even less, since
> there's so little vibration.  A 'conical' setup would be dirt-simple to
> design/build, and a full set of the soft parts could be had for way
> south of $50. There are still a lot of conical mount Lycs in
> circulation, so obtaining a mount from a kit mfgr should be a simple
> matter.
>
> If you want to post the pics on the list, I'll be happy to resize them
> for you; just send them to me the address in my name, above.
>
> Charlie
>

   Charlie,
        The type 1 and type 2 dynafocal mount rings as used by the Lycoming
320/360 engines are completely
different from the mount rings used by the Lycoming I/O 540...........The
cushions (rubbers) are similar (and
may even be the same as far as I know) but the shape and dimensions of the
320/360 and I/O 540 rings are
not the same as stated............I agree the "Dynafocal" cushions are
expensive and for a 13B there are other
mount solutions but the proposed side plate/mount is aimed primarily at the
20B as a bolt in replacement for
those aircraft that are normally powered by the Lycoming I/O 540 family of
engines......If this side plate/mount
is actually built I have committed for the "Beta" version which I will use
on an all alloy "P port" 13BREW that I
already have "Racing Beat" alloy center and rear side housings.......I have
a 20B but it is too much power and
weight (even all alloy) for my "Dyke Delta"...........I appreciate all
comments and discussion.........
       I will send the photos to your Email for resizing.............

Thanks,
Kelly troyer

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<div dir=3D"ltr"><div dir=3D"ltr"><div>=C2=A0<br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Aug 2, 2020 =
at 7:22 PM Charlie England <a href=3D"mailto:ceengland7@gmail.com">ceenglan=
d7@gmail.com</a> &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrota=
ry@lancaironline.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">On 8/2/2020 5:52 PM, Kelly Troyer <a href=3D"mailto:kel=
tro@gmail.com" target=3D"_blank">keltro@gmail.com</a> wrote:<br>
&gt; Group,<br>
&gt; =C2=A0 As stated in a previous=C2=A0 E mail=C2=A0I have photos of a ju=
nk lycoming I/O <br>
&gt; 540 crankcase with the &quot;Dyna 1&quot; mount ring as used by the &q=
uot;Vans&quot; RV10 <br>
&gt; bolted to<br>
&gt; the top mount &quot;Ears&quot;............I machined a wooden plug to =
fit the <br>
&gt; the Lycoming rear crankshaft bearing journal and the outer portion of =
<br>
&gt; the plug to fit the<br>
&gt; &quot; ID &quot; of the RX8 Renesis front cover seal area...........Th=
is was to <br>
&gt; show if the Renesis cover would fit within the confines of the <br>
&gt; Lycoming I/O 540 mount<br>
&gt; ring................It fits very well with only the stock Renesis <br>
&gt; alternator mount (top of the waterpump=C2=A0portion of the cover) need=
ing <br>
&gt; to be removed=C2=A0and the<br>
&gt; alternator relocated........These photos are too large to go <br>
&gt; through=C2=A0the forum but I can send them to any of the group that ma=
y <br>
&gt; want to see them via your<br>
&gt; personal=C2=A0E mail=C2=A0address.............Just let me know........=
..<br>
&gt;<br>
&gt; Best,<br>
&gt; Kelly troyer<br>
&gt;<br>
&gt;<br>
Hi Kelly,<br>
<br>
Is the 540 mount ring the same diameter as the 320/360 ring? If not, <br>
it&#39;s not going to help most people who are running 2 rotor engines. If =
<br>
you need a measurement on the mount for the smaller engines, I&#39;ve got <=
br>
one hanging in the hangar.<br>
<br>
BTW, for the 320/360 engines, the type 2 mount is pretty rare. IIRC, it <br=
>
was only used on some light twins and maybe a single or two, that used <br>
an extended hub constant speed prop.<br>
<br>
Which brings up a point that is significant to me. As I mentioned <br>
earlier, the dyna mount is intended to converge the mounting bolt angles <b=
r>
at the cg of the engine/prop combination in order for it to be truly <br>
effective.=C2=A0 It also requires quite expensive mount &#39;rubbers&#39;. =
I&#39;ve flown <br>
a significant number of hours behind both dyna and &#39;conical&#39; (strai=
ght <br>
mount) Lyc engines, and the dyna is honestly not worth the extra <br>
$300-$400 expense. On a rotary, the value should be even less, since <br>
there&#39;s so little vibration.=C2=A0 A &#39;conical&#39; setup would be d=
irt-simple to <br>
design/build, and a full set of the soft parts could be had for way <br>
south of $50. There are still a lot of conical mount Lycs in <br>
circulation, so obtaining a mount from a kit mfgr should be a simple matter=
.<br>
<br>
If you want to post the pics on the list, I&#39;ll be happy to resize them =
<br>
for you; just send them to me the address in my name, above.<br>
<br>
Charlie<br></blockquote><div><br></div><div>=C2=A0 =C2=A0Charlie,</div><div=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 The type 1 and type 2 dynafocal mount rings as=
 used by the Lycoming 320/360 engines are completely</div><div>different fr=
om the mount rings used by the Lycoming I/O 540...........The cushions (rub=
bers) are similar (and</div><div>may even be the same as far as I know) but=
 the shape and dimensions of the 320/360 and I/O 540 rings are</div><div>no=
t the same as stated............I agree the &quot;Dynafocal&quot; cushions =
are expensive and for a 13B there are other=C2=A0</div><div>mount solutions=
 but the proposed side plate/mount is aimed primarily at the 20B as a bolt =
in replacement for=C2=A0</div><div>those aircraft that are normally powered=
 by the Lycoming I/O 540 family of engines......If this side plate/mount</d=
iv><div>is actually built I have committed for the &quot;Beta&quot; version=
 which I will use on an all alloy &quot;P port&quot; 13BREW that I</div><di=
v>already have &quot;Racing Beat&quot; alloy center and rear side housings.=
......I have a 20B but it is too much power and</div><div>weight (even all =
alloy) for my &quot;Dyke Delta&quot;...........I appreciate all comments an=
d discussion.........</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0I will send the =
photos to your Email=C2=A0for=C2=A0resizing.............</div><div><br></di=
v><div>Thanks,</div><div>Kelly troyer</div><div><br></div><div>=C2=A0 =C2=
=A0</div></div></div>

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