OS 91FX

[Scott Anderson]

What is everyone using for a pipe length? From glow plug to the first baffle
in the pipe. (straight line) for the OS 91.

Thanks.


----- Original Message ----- 
From: "Ihncheol Park" <PatternFlyer at msn.com>
To: <discussion at nsrca.org>
Sent: Monday, October 27, 2003 10:07 PM
Subject: RE: OS 91FX


> Tower hobbies has them for $4.79
> Your local hobbyshops should be able to get you a good price also.
> Gasket set. OS part # 29514000 or Tower Part# LXCM87
>
> Ihncheol
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of randy10926 at comcast.net
> Sent: Monday, October 27, 2003 8:49 AM
> To: discussion at nsrca.org
> Subject: RE: OS 91FX
>
>
> Been thinking of putting my OS91FX into the Killer Chaos I am building.
> Added a turtle deck to the Fuse that goes to the middle of the wing.
> Probably don't need it but I have a header and pipe for the engine as
well.
>
> My OS91FX runs better with a Perry carb up front; but have not needed the
> pump yet.  May turn adding a head shim.   Where do you get them?
>
> Randy
> > Nat,
> >
> > What are the differences between running the 17x10N cut down to 16" and
> > normal 16x10?
> > Also, from a pro_performance spreadsheet which I downloaded from a
> website.
> > Thrust = 2.83E-12 x RPM^2 x D^4
> >
> > 15x8 @ 10K rpm (actually running rpm): 15.9 pound of thrust show up.
> > 17x10 @7800 : 15.96 pound
> > 16x10 @8000 : 13.18 pound
> >
> > Not really sure if the equation is meaningful at the actual running.
> > Are you using the larger diameter prop to reduce noise?
> > I also heard you were using 91SX-H.
> >
> > Ihncheol Park
> >
> > -----Original Message-----
> > From: discussion-request at nsrca.org
> > [mailto:discussion-request at nsrca.org]On Behalf Of Nat Penton
> > Sent: Saturday, October 25, 2003 10:25 PM
> > To: discussion at nsrca.org
> > Subject: Re: OS 91FX
> >
> >
> > Matt I will add additional  info. Have been running the 91FX over two
> years
> > and it will carry my 8+ lb airplanes to the moon. On fuel - was using
> > Ritches 20%, now 30%,idles under 1500. Pipe length- 26 to 28" depending
on
> > which pipe, most power from ES 2 stk(1 9/16 OD), Favorite props 17X10N
cut
> > to16" and 15.5X12, rpms around 7700. Using Hanno (same as 140RX)
backplate
> > pump. Can be installed with simple tools and a little ingenuity. O yes 2
> > headshims. Stock bearings good for about 30 flts, Boca sealed well over
> 100,
> > leave all seals in place. Provide crankcase cooling for longer bearing
> life.
> > Have not tried 15CC Hatori or MACS but plan to. Headers are from Karl
> > Mueller,very nice.
> > ----- Original Message -----
> > From: "David Gundling" <DGundling at compuserve.com>
> > To: <discussion at nsrca.org>
> > Sent: Saturday, October 25, 2003 8:34 AM
> > Subject: Re: OS 91FX
> >
> >
> > > Message text written by INTERNET:discussion at nsrca.org
> > > >The 91 FX is stronger than the ys 91 4 cycle with some margin.
Stretch
> > the
> > >
> > > pipe a bit with an extra long header and run the larger prop. The
set-up
> > > will
> > > amaze you with its output and quietness. Good friend Nat is using it
on
> > his
> > >
> > > X-Press turning a 17x10 N cut down 1/2 inch. Plenty of power for the
8-9
> > > pound
> > > plane.
> > >
> > > Matt K<
> > >
> > > Matt,
> > >
> > > Thanks.
> > >
> > > Dave
> > > # To be removed from this list, send a message to
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> > >
> > >
> > >
> >
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