YS Engines

Tue Mar 30 05:20:18 AKST 2004

Lance:

I already installed a second plug.  The iddle improve but not enought to help on the downlines.

Vicente
> Vincent,
> You might consider a Mintor 2 plug head for your OS140.  It will help the
> idle and is easier than repitching props.
> --Lance
> 
> ----- Original Message ----- 
> From: <vicenterc at comcast.net>
> To: <discussion at nsrca.org>
> Cc: "David Lockhart" <DaveL322 at comcast.net>; <discussion at nsrca.org>
> Sent: Monday, March 29, 2004 5:02 PM
> Subject: Re: YS Engines
> 
> 
> > Looks like I need to learn how to re-pitch 3 blade props.
> >
> > I have two planes a Hydeout (with retracts) with an OS 140 RX.  I would
> like to reduce the downline speed.  I have a Focus with a Mintor 140 that is
> OK on the downlines but probably will be better is I can reduce the speed a
> little.
> >
> > Yesterday, I tried to go down to 1500 rpm but the engine dies on the spin.
> The minimum possible is around 1700 rpm.
> >
> > Another solution is for me is to buy a 3 blade prop standard that will
> work with the OS-140.  Any ideas?
> >
> > I just realize that I have to buy a new spinner also.
> >
> > Vicente
> > > Nat,
> > >
> > > Yes and no.
> > >

> > > No - given same prop and same idle RPM.  However, given the different
> nature
> > > of the engines, it seems pretty logical to me that the best 4C prop is
> not
> > > going to be the best 2C prop.  Idle RPM - the average 140/160 DZs I've
> seen
> > > idles faster and rougher than the average L or FZ (the DZs of course
> make
> > > much more power than the L or FZ), and the big 2C happily idles slower
> and
> > > smoother than a DZ, L, or FZ.
> > >
> > > Yes - using a setup oriented for the 2C.  The last 2 years I've run an
> APC
> > > 15.75-11 3 blade (repitched from the 15.75-13) with the idle set at
> about
> > > 1700 on the OS 140 EFI (same idle speed when I ran the 140RX).  I
> believe
> > > this setup provides better downline braking than the average 4C setup
> > > (especially a DZ).  And if I choose, I can lower the idle to 1500 and it
> is
> > > still reliable and doesn't shake apart the plane.
> > >
> > > The past 3 years, I flown a pair of EMCs that are 10.75 pounds and very

> > > clean (all servos, switches, fuel lines, fasteners, etc are mounted
> >
> > > internally or flush).  The first year, a couple people thought I was
> > > constant speed - but too fast everywhere (too much power is such a
> terrible
> > > problem to have.........).  The past two years I've used the 3 blade,
> and
> > > many people at the NATs and locally (D1, D2, and D4) have remarked how
> slow
> > > my plane is in a downline, and how constant speed the plane is - which
> is
> > > nice to hear - because that was my goal after the first year.  Several
> > > others have tried the prop and plan to run it for 2004 - I think that in
> > > itself speaks volumes.
> > >
> > > Dave
> > > DaveL322 at comcast.net
> > >
> > >
> > > ----- Original Message -----
> > > From: Nat Penton
> > > To: discussion at nsrca.org
> > > Sent: Monday, March 29, 2004 2:05 PM
> > > Subject: Re: YS Engines
> > >
> > >
> > > Dave can you get the downline braking with a two stroke you can get with
> a
> > > four ?          nat
> > > ----- Original Message -----

> > > From: David Lockhart
> > > To: discussion at nsrca.org
> > > Sent: Sunday, March 28, 2004 11:18 PM
> > > Subject: Re: YS Engines
> > >
> > >
> > > Ed,
> > >
> >
> > > I took a quick look at the 2003 Nationals results for Masters and FAI.
> > > Looks like 1st place in Masters was a 2C, and 5 of the top 10 in Masters
> > > were 2Cs.  FAI was won by a YS4C, and 4 of the top ten were 2Cs.  If
> memory
> > > serves me correctly, all 6 of the 4C fliers are sponsored by YS and one
> of
> > > the 2C fliers might be sponsored.
> > >
> > > I've been flying FAI for 5 seasons and used 3 different 2C setups and
> don't
> > > feel that I am missing out on a warm fuzzy feeling.  Maybe that is
> because
> > > my 2C is cheaper, vibrates less, requires less maintenance, and is more
> > > reliable than a 4C (parts is parts).  And I've not yet found a 140DZ or
> > > 160DZ (w/ 30% nitro) with enough power to spin the prop I am running on
> my
> > > 2C (w/ 20% nitro) - and yes, my 2C has plenty of torque and a linear

> > > throttle.  Oh yes, it is also quieter and uses less fuel per flight than
> a
> > > 140/160DZ.
> > >
> > > 4Cs became very popular in pattern when the rules changed to allow a 4C
> to
> > > have 2x the displacement of the 2C and YS very successfully exploited
> that
> >
> > > rule change and designed and produced some very powerful competition
> 4Cs.
> > > Had it not been for that rule change, I doubt the 4C would have ever
> even
> > > become popular in pattern.  As the current rules do not give an
> advantage to
> > > a 2C or 4C, the 2Cs will return to dominance - unless the electrics take
> > > over first.
> > >
> > > But then again, as others have pointed out, some pattern guys just like
> to
> > > buy the most expensive toys and spend endless hours
> tinkering..............
> > >
> > > Regards,
> > >
> > > Dave Lockhart
> > > DaveL322 at comcast.net
> > >
> > >
> > > ----- Original Message -----
> > > From: Troy Newman
> > > To: discussion at nsrca.org
> > > Sent: Sunday, March 28, 2004 11:16 PM
> > > Subject: Re: YS Engines
> > >
> > >

> > > Yamada the company that makes YS motors is dedicated to the support of
> F3A
> > > (pattern on the international scene).
> > >
> > > The main reason YS motors dominate is because of their performance. The
> > > problem is there are limited sizes of motors....The YS 160DZ is now the
> > > biggest motor produced. It can fly about a 13lb plane and still have
> enough
> >
> > > power to hover it. So a 100" IMAC model just isn't in the realm of the
> YS
> > > motor. If YS made a 100cc gas motor man alive would everybody want one.
> Mr.
> > > Yamada knows how to make Horsepower!
> > >
> > > It is my understanding that Mr. Yamada used to work at Honda back in the
> old
> > > days when the small Honda motors were revolutionary in motor cycles,
> smaller
> > > compact cars and so on.
> > >
> > > As for Fun fly planes the YS 63 is probably the ultimate power plant for
> any
> > > 46 sized model. Its got tremendous power and without a weight problem.
> The
> > > Flip 3D's, Madness, and other 3D funfly planes like the Hover Cobra,
> Magic,

> > > Razor, and UCD 46 are perfect models for the 63
> > >
> > >
> > > I have seen YS 140Sport,s and 140L's run scale models up to 15-17lbs and
> > > depending on the plane it will fly them but you will not have the extra
> > > power.
> > >
> > > Now Heli's YS has a good foothold with the different motors they offer
> > > including a 91 4stroke Heli motor.
> > >
> > > YS engines are probably the best model motors produced today.
> > >
> >
> > > I can choose any motor I want to run and I choose the YS motors above
> others
> > > because of the quality and performance. Here in recent years the 2cycle
> > > motors have taken a foothold in the lower classes of pattern flying.
> They
> > > make tons of power and tend to give a less experienced flyer a warm
> fuzzy
> > > feeling. They will make good power on 15% nitro and even not setup
> correctly
> > > they will make big power....I have run them from the OS EFI, to the
> Webra
> > > with mixture control carbs. With other in between.
> > >

> > > I prefer the YS 4 strokes because they perform better. So the main
> reason YS
> > > dominates Pattern and not other forms is because they focus on pattern
> > > models and pattern type setups. Because of this focus the motors do the
> job
> > > the best....The bigger models just will have to wait for YS to produce
> > > bigger motors if ever.
> > >
> > >
> > > Troy Newman
> > >
> > > ----- Original Message -----
> > > From: Edward C. Hernandez
> > > To: discussion at nsrca.org
> > > Sent: Sunday, March 28, 2004 8:55 PM
> > > Subject: YS Engines
> > >
> > >
> >
> > >    Ok, time for another newbie question: it seems to me from the
> discussion
> > > and contest results and a few copies of the K factor that Kane gave me
> at
> > > the D4 contest last year that pattern pilots prefer YS engines, yet YS
> > > engines don't seem to dominate in other kinds of flying(IMAC, scale, fun
> > > fly, etc). Um, why?
> > >
> > > Ed Hernandez
> > >
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