[NSRCA-discussion] Mounting Dimension - Hyde "Type C"

[Woodward, Jim]

Colin,

 

I have some brief experience with the AR80 and was unable to keep the
header tight to the motor for more than 2 or 3 flights (without a header
support).  The other guys can respond but I think you'll find the need
to use a header support with this mount.

Thanks,

Jim W.


 
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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of colin
chariandy
Sent: Wednesday, September 19, 2007 9:19 AM
To: NSRCA Mailing List
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> 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

		
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