3M / OS header O-ring size

[Dave Smith]

The engine, OS 140RX is on a "soft" mount that is quite stiff.
The ES XL80 pipe is mounted with a PAC spring type mount near the baffle,and
a Dave Brown mount in the middle of the Prather silicone coupler at the
front end.
The rear mount is hard mounted,the front one is held loosely with a tie
wrap,which allows a bit of movement.
A thin layer of high temp silicone is applied to the pipe where the Pac
mount makes contact in order to avoid vibration wearing a hole in the pipe.
The pipe and coupler are separated by no more than 3/32nd ".   Much more gap
and the coupler would not last. A small gap and it will last a long time.

Dave
----- Original Message -----
From: "wgalligan" <wgalligan at cnbcom.net>
To: <discussion at nsrca.org>
Sent: Friday, May 23, 2003 6:00 PM
Subject: Re: 3M / OS header O-ring size


> How do yo mount your engine and pipe?
>
> WG
>
> ----- Original Message -----
> From: "Dave Smith" <dfs at navnet.net>
> To: <discussion at nsrca.org>
> Sent: Friday, May 23, 2003 3:53 PM
> Subject: Re: 3M / OS header O-ring size
>
>
> > I get about 90 flights on a set of OS "O" rings.   How many do you guys
> get?
> >
> > TIA,,,,,,Dave
> >
> > ----- Original Message -----
> > From: "Earl Vincent" <ev3464 at sccoast.net>
> > To: <discussion at nsrca.org>
> > Sent: Friday, May 23, 2003 2:32 PM
> > Subject: Re: 3M / OS header O-ring size
> >
> >
> > > If you can get automobile compressor o-rings, I use the ones for a
Ford
> > they
> > > are green in color a little thicker than OS but once in they seem to
> last
> > at
> > > least as long as the OS ones.
> > > Earl
> > > ----- Original Message -----
> > > From: "John Crozier" <sjcrozier at comcast.net>
> > > To: <discussion at nsrca.org>
> > > Sent: Friday, May 23, 2003 2:18 PM
> > > Subject: Re: 3M / OS header O-ring size
> > >
> > >
> > > > I took my original O rings to an automotive shop and found the
correct
> > > size.
> > > > Now the bad news.
> > > > They lasted only a couple dozen flights.
> > > > I believe the hardware store variety is not of sufficient quality
for
> > > > reasonable longevity.
> > > > I have just ordered the "real thing" from Lance at
> Aeroslave.com....croz
> > > > ----- Original Message -----
> > > > From: "Woodward James R Civ 412 TW/DRP/ACQ"
> > > <James.Woodward2 at edwards.af.mil>
> > > > To: <discussion at nsrca.org>
> > > > Sent: Friday, May 23, 2003 11:10 AM
> > > > Subject: 3M / OS header O-ring size
> > > >
> > > >
> > > > > Hi All,
> > > > >
> > > > >
> > > > >
> > > > > Does anyone have a part number or size that I can use to go to the
> > > > hardware
> > > > > store and get some more of the rubber o-rings for the headers?
> > > > >
> > > > >
> > > > >
> > > > > I've found that if you don't support the pipe and header, they
wear
> > out
> > > > > fast!
> > > > >
> > > > >
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Jim W.
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > =====================================
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> > > > #
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> > >
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> >
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> >
> >
>
>
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