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Brian,
I am using a set of the Mcmaster Carr
mounts on my plane and I sold my set of dynafocal mount rubber because I wouldn’t
need them. There is all the difference in the world in the two types of
mounts. If you consider the fact that the entire engine and prop assembly is
cantilevered out off of the dynafocal mount and must carry 5 or 6 Gs you will
begin to understand why there is such a difference in price.
I shudder to think how many thousands of
lbs each of those rubber bushings has to withstand! They are damn tough!
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of bktrub@aol.com
Sent: Friday, May 06, 2011 7:02 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: vibration
isolators/motor mounts
Ok, so those don't fit in the cups of the
dynafocal mounts. Maybe there is a way to make some sort of adapter that fits
into the cups on the dynafocal in order to use the Mcmaster-Carr mounts. It
might be worth it due to the price difference- about $250-$300 for the full on
aircraft rubber pieces versus $23.80 for the Mcmaster- Carr pieces.
-----Original
Message-----
From: Kelly Troyer <keltro@att.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Fri, May 6, 2011 2:06 pm
Subject: [FlyRotary] Re: vibration isolators/motor mounts
I checked out all of
McMaster Carr's offerings and non will fit or replace the
Dynafocal type mounts..........I know
that the bottom plate type of mount does
use these type of
cushion/isolators............
Kelly Troyer
"DYKE DELTA
JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
From: "bktrub@aol.com"
<bktrub@aol.com>
To: Rotary
motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, May 6, 2011 3:42:20 PM
Subject: [FlyRotary] vibration
isolators/motor mounts
I'm telling you- go to McMaster- Carr.
They have Barry shock mounts that are just like the ones on our aircraft,
except the price is a little less- $5.95 each. That's what I used on my plane,
and they work great.
Bottom of the page- 6309K35A- I used the
240 lb. Version.
-----Original
Message-----
From: Marc Wiese <cardmarc@charter.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, May 6, 2011 12:25 pm
Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)
My Bad. Been working
on a friends twin commanche too much. The motor mount is from a Cardinal RG
nose retract and uses the Lyc IO360 A1B6 200 hp angle valve cylinders. So
it’s a type 1.
Maybe we can use it to
test fit up that new back/front plate!!
BTW, those mm shock
donuts are costly for most of these systems. We got to find cheaper compliant
donuts.
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Kelly Troyer
Sent: Friday, May 06, 2011 1:24 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Back-plate
(93-95 Front Side Hsd Needed)
The
Mistral backplate is for a Dynafocal Type 1 , 30 degree mount ring
which is standard for most Lycoming
0-320 & all 0 & I0-360 engines (that I
am aware of))..............The Dynafocal
Type 2 , 18 degree mount ring was
designed for a specific 0-320 engine
installed in the Twin Comanche with
an extra 2.5 inch extended prop
hub..............This put the engine CG ahead
the 30 degree mount focal point of
approx 14.25 inches so the 18 degree
mount was designed to again put the
engine CG slightly behind the 18 degree
focal point.............If your Cardinal
has the type 2 , 18 degree mount then it
probably has a 0-320 with the extra pop
hub length..........If not maybe Cessna
got a good deal on this particular 0-320
engine model back then.........If by
chance your Cardinal has an 0-360 then
all bets are off as I haven't heard
of a 0-360 model with the Type 2 , 18
degree mount............<:)
As for the 93-95
13BREW front side plate Bryan
may have found us an
unserviceable one............We will
see............As many of these engnes that
have been over-heated , over-boosted
and over-reved we should be able to
come up with a junk one.............
Kelly Troyer
"DYKE DELTA
JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
I also have a type II
dynafocal engine mount (from a Cardinal RG!)….
I may have one of
those 13Brew “front plates”, but it is “useable”.
I too would like a
dynafocal type II mount…..for both of my 13Brews and the 20B…
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On Behalf Of Kelly Troyer
Sent: Wednesday, May 04, 2011 6:09
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re:
Back-plate (93-95 Front Side Hsd Needed)
Yes I know I am
a troublemaker (too much computer time available with my day job) and some
of you are probably sick of all my posts !!.............."But" with
that being said one of our group is seriously considering the development
of a "Mistral" type
back-plate to allow the use of a standard
"Lycoming" "Dynafocal type 1" engine mount ring that will
be a virtual "Bolt-on" to the
93-95 13BREW , Cosmo 13B & 20B
and the Renesis 13B Rotarys.............Several builders and potentials have
indicated they
would be interested in such a back-plate
(including me)............I have one of the few "Mistral" back-plates
that ended up in the
hands of experimenters (waited 2 years
for it)..........It is severely over engineered for our use (and overpriced)
and has many
features we do not need...........
If you have followed
"Back-plate" string of posts recently you know that Jarrett Johnson
one our group with aspirations to
install a Cosmo 20B in his project
started the discussion first about an developing an intake manifold for
13B & 20B Rotarys
(which needs to be done also) then I
jumped in and said that a common engine mount design might also be needed
and if
you have been reading the posts lately a
lot of info has been kicked around about the various Rotarys and
what it will take to "Marry" the "Mistral"
back-plate with a "RX8 "Renesis" water-pump (with the magic of
digital scanning & CAD) to design
such a back-plate.........
Those that have
been on the Rotary forum for several years may remember Jarrett posting his
trials and tribulations in
building a huge CAM
mill (at home).............He is a commercial designer with the talent and
equipment (including foundry)
to pull this off............I have
offered my "Mistral" back-plate to be scanned (He trying to find
someone here in Okla
to do
the job) and I also have a
"Renesis" front cover to scan............What we really need now is a
93-95 13BREW front side
housing (unusable condition preferred as
long as front side is undamaged) to put in his hands as this is what the
back-plate
will bolt to..............If someone in
the group has an unusable 93-95 13BREW front side housing they will donate I
will pay
to have it shipped to
Jarrett..............You may contact me off the forum if you would
prefer..........I have no horse in this race
I would just like to see such a product
be made available to the group..........
Kelly Troyer
"DYKE DELTA
JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
Will be a good idea to
scan both the Mistral and Renesis housings.............You really need
a 93-95 13BREW (preferably) or Cosmo
20B front housing to scan.............Most of my 13B
engines are
86-91.............My Cosmo 13B is adaptable but lacks some
of the machined bolt
and stud pads of the 13BREW,
Renesis or Cosmo 20B front side housing which you need
to make allowances for on the redesigned
back-plate if you want it to fit all three versions of
these engines..................Throw this
out to the group and see if someone has a 1993-95
13BREW front side hsg (need not be
usable) they would donate or lend to the project.........
You really need this front
side housing in front of you......... Even with all the scans nothing
beats having the actual
hardware............IMHO
Kelly Troyer
"DYKE DELTA
JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
Evening Kelly, so just thought I'd send a
note w/ an update. I did find a fella in Tulsa
who has access to a laser scanner. He's getting me some pricing
on what it would cost to get the job
done. I'm thinking it might be a good idea to get both the Mistral housing as
well as a Renisis Front Cover scanned?
I'd like to get an
Iron [preferably the side that mates to the front cover] scanned as
well but don't know if you've got one handy [as in, not 'in' an engine]. I
could always
do it here in time but that might take a
bit before I get my hands on one that is not in an engine.
-- Homepage: http://www.flyrotary.com/ ; Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html
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