OS Piston Pin

[VicenteRC at aol.com]

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
> > =====================================
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> >
> 
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