Gasser - Was "OS Piston Pin"

[Bob Pastorello]

YES !!  Having Been there, Done that...and NOW converting my gas pattern to
a glow, I can attest to the weight, vibration, and noise issue.
    The MVVS 1.6 gasser is as close as there is right now.  And it's not
quite as powerful as the old YS 1.20 Std., but close.  Just fine for a 9 lb
airframe....but...5kg, 2M, higher-drag ships, well, the manufacturers
haven't addressed it-yet...
    The motor itself is getting close; BME and DA both have (or are soon to
have) 50cc motors in the 2.4 lb range.  But that's TOO MUCH power/prop.
    A very fine solution would be a 1.8 cu in, in a conventional glow-type
crankcase, with VERY lightweight ignition....THEN we'd have something....

Bob Pastorello, Oklahoma
NSRCA 199, IMAC 1320, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: <VicenteRC at aol.com>
To: <discussion at nsrca.org>
Sent: Saturday, July 05, 2003 8:03 AM
Subject: Re: OS Piston Pin


> Jim:
>
> The problem with gasoline engines is that in the range size and power of
the OS 140 or similar, the gasoline engine weight between 1 lb and 1.5 lb
more.  It will be nice that the manufacturers go back to drawing board and
produce a very light gasoline that could be used pattern.
>
> Regards,
>
> Vicente Bortone
>
>
>
>
>
> In a message dated 7/4/2003 1:00:53 PM Eastern Standard Time,
JOddino at socal.rr.com writes:
>
> >
> >
> > You folks are sure making a case for gas engines with enough
displacement to
> > get the job done.  My DA50 is barely broken in at 100 flights.  I
recently
> > got an e-mail from a guy who put one in a Gator Giles 202.  It went to
14
> > pounds but I bet it does exactly what pattern pilots are looking for.
Super
> > thrust and good braking.  Get rid of the weight limit and you'd see
whole
> > new breed of two meter pattern planes.
> > My 202 with the OS 1.40 EFI is sitting collecting dust since the bearing
> > went out at, you got it, 100 flights.  I'd rather fly than rebuild
engines.
> > Jim
> > ----- Original Message ----- 
> > From: <flyboy422 at juno.com>
> > To: <discussion at nsrca.org>
> > Sent: Friday, July 04, 2003 9:09 AM
> > Subject: Re: OS Piston Pin
> >
> >
> > > Verne,
> > >
> > >      If you can stand one more take on the OS piston I'll share my
> > > experience.  I have been flying OS 140's for 3 years which means I
have
> > > been changing bearings at least twice a year.  Everything that has
been
> > > written on the list regarding the wrist pin is correct.  The method I
use
> > > for the bearing is as follows:  Perheat your oven to 500 degrees.
Clean
> > > as much fuel off the case as you can.  Put the case in the oven for 30
> > > minutes.  When you open the oven door, the bearing will be out of the
> > > case.  If  you are not this lucky, it will only take a slight rap to
> > > finish the job.  Put the new bearing(stainless) in the freezer for the
> > > same 30 minutes.  I remove any shields from the bearing.  They only
will
> > > restrict lubrication.  Put the bearing onto the crankshaft and insert
> > > into the case.  I know you'll know what to do next.
> > >
> > >        I suggest you use only stainless bearings and expect to get
about
> > > 100 runs out of it.  The early warning sign of wear will be a slight
> > > rocking of the prop when the engine is hot.    Once that starts you
have
> > > about 10 flights left.  I use after run oil religiously.
> > Good luck and
> > > I'll see you at the Nats.
> > >
> > > Steve Miller
> > > =====================================
> > > # To be removed from this list, send a message to
> > > # discussion-request at nsrca.org
> > > # and put leave discussion on the first line of the body.
> > > #
> > >
> >
> > =====================================
> > # To be removed from this list, send a message to
> > # discussion-request at nsrca.org
> > # and put leave discussion on the first line of the body.
> > #
> =====================================
> # To be removed from this list, send a message to
> # discussion-request at nsrca.org
> # and put leave discussion on the first line of the body.
> #
>

=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#