[NSRCA-discussion] O rings

Wed Sep 19 09:03:21 AKDT 2007

You could try a local industrial supply store, one that sells hydraulic or
pneumatic cylinders, valves etc. O-rings are standardized for size, material
and hardness (durometer). They are inexpensive and if they don’t stock the
sizes or material needed they can order them in any quantity you wish.
Jim Hiller

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Leonard Rudy
Sent: Wednesday, September 19, 2007 9:36 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] O rings

Does anyone know where I can get a supply of O rings that fit the headers
that use one
and also the larger ones that go on a Dave Brown pipe mount?

                    Len
Mike Hester <kerlock at comcast.net> wrote:
hi Colin,

yes and no. If you get the header really tight, you don't need any
additional support. just realize it has to be TIGHT where it screws into the
head.

I am using the header brace (the crazy japanese one) and it works very well.
But we have run it without one and it also works just fine.

The one thing you have to realize with this mount is that not if, but WHEN
the engine kicks, you need a bit more clearance than normal. As in, relieve
your chin cowl lest you lose it. A small price to pay for a really smooth
mount.

I don't have anything else to compare it to so I don't know if the O ring
wears faster with this mount than with a stiffer one, but I'd like that
answer. Not that it matters, an O ring isn't exactly expensive.

One thing to note is that my initial concern long ago was the possibility of
breaking headers etc. Well, not yet. After tons of flight time, all of the
headers are just fine.

Just make sure you soft mount the muffler. The soft mount that comes with it
works just fine, and the spring type mount works pretty well too.

My hat's off to Merle on this one, these things just keep getting better.
Rumor has it there are even more improvements and experiments on the
horizon!

-Mike

PS Now I'd like to try an AR95 =)
----- Original Message -----
From: colin chariandy <mailto:cchariandy at yahoo.ca>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, September 19, 2007 9:18 AM
Subject: Re: [NSRCA-discussion] Mounting Dimension - Hyde "Type C"

Does anyone know where the limit lies for adding support to headers with the
newer mounts (AR60, AR70, AR80 etc)?

If the short Hatori muffler and header is used with the AR80 do we need some
additional support?

Colin.

Lance Van Nostrand < patterndude at tx.rr.com <mailto:patterndude at tx.rr.com> >
wrote:
These type C's are really new (the Mk III's anyway).  I would assume Merle's
dimensions have not really changed.  Here's some info I got from Merle
directly that others may find interesting.  I sure did:

Hi Lance,

I don't have any pictures.  The new "C" MKIII mount (isolator) looks the
same as the earlier ones.  Now I am using rectangular 1/4" x 1/2" aluminum
beams oriented/attached flat on the mount.  This makes the mount now usable
with 18 pattern engines, including the OS160 which is a wide crankcase
engine.

Each beam has 6 drilled and tapped 6-32 holes - permitting a wide
application range.  Beams positioned flat are even stronger.  Overall length
from firewall to thrust washer is 6 3/8" for all YS, 3M, WEB, OS140, OS160,
and OS120-200 4 strokes.  Use of different beam bolt patterns even permits 6
1/4" FW to TW for many engines!!

The "AR"(A)s (2 engine lug holes attachment) are being discontinued and
being replaced with all 4 engine lug attachment aluminum beams.  The newer
mounts, that replace them, are being rated by "CDR" (current drain
reduction).  The "CDR" range is from 60-95%, and the mounts will be
identified as "AR 60", "AR 70", "AR 80", "AR 85", "AR 90", and "AR 95", plus
a very light weight MICRO series, that are "MR 80", "MR 85", "MR 90", "MR
95".

The highest CDR numbers are the softest mounts and require more airframe
clearance for idle movement, plus softer mounts requires exhaust attachment
methods as we have discussed in the past, or a method for the exhaust system
to endure the "ride" or additional movement - overall benefits of the very
soft mounts are to the major high value airborne equipment - such as servos,
pots, gears, linkage, including entire airframe.

All are for 4 engine lug hole attachment and position the most popular
engines at 6 3/8" or 6 1/4" from firewall to thrust washer.

The "AR 80" is highly recommended by Mike Hester for the "beastie DZs".

I will continue the firmer Type "C" MKIIIs.

The CDR rating is an average for engines from 1.20 to 2.0 cuin. - the rating
is approximate for a 160 size engine.  The aluminum beam mounts will no
longer be engine specific - except for those that incorporate the nose
ring - the ARI series must be set up for a specific engine due to varying
front housing diameters and etc..

I'm sure this will be confusing for a while - but with consistent overall
length and wide engine applications there will actually be considerably
fewer mounts to chose from - approximately 10  if all the CDRs are in the
mix - vs 25 to 30 - Central carries the "AR 80", and may include the "AR
60"s and "AR 70"s.  Also I have modified the firewall attachment bolt
pattern to permit use of either 3 or 4 attachment screws - the new bolt
pattern permitts the selection of either a "triangle" or "rectangle"
pattern - making the mounts interchange with other brands - plus permitting
the use with many engines makes the mounts fairly universal.  The pattern
guys like to interchange engines, they can now also interchange some
mounts..

Best,

Merle
----- Original Message -----
From: Bob Pastorello <mailto:rcaerobob at cox.net>
To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org>
Sent: Tuesday, September 18, 2007 7:31 PM
Subject: [NSRCA-discussion] Mounting Dimension - Hyde "Type C"

Would anyone who is using this mount with an OS 1.60 tell me the minimum
firewall to spinner backplate dimension this mount will permit?  I have only
so much nose....

Bob Pastorello
www.rcaerobats.net <http://www.rcaerobats.net/>
rcaerobob at cox.net <mailto:rcaerobob at cox.net>
  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org <mailto:NSRCA-discussion at lists.nsrca.org>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

  _____

Be smarter than spam. See how smart SpamGuard is at giving junk email the
boot with the All-new Yahoo! Mail
<http://us.rd.yahoo.com/evt=40705/*http://mrd.mail.yahoo.com/try_beta?.intl=
ca>
  _____

_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
_______________________________________________
NSRCA-discussion mailing list
NSRCA-discussion at lists.nsrca.org
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

  _____

Looking for a deal? Find great prices on flights and hotels
<http://us.rd.yahoo.com/evt=47094/*http://farechase.yahoo.com/;_ylc=X3oDMTFi
cDJoNDllBF9TAzk3NDA3NTg5BHBvcwMxMwRzZWMDZ3JvdXBzBHNsawNlbWFpbC1uY20->  with
Yahoo! FareChase.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20070919/41d4936e/attachment-0001.html 