YS Engines

Tue Mar 30 15:33:07 AKST 2004

I have run the BOlly 16.5 x 12 three blade in the past;  I have one of
Dave's repitched APC's in the 12 pitch flavor....so I'll be able to compare
them.  Bolly's are usually noisier, and seem to turn faster, but require
more "spool up" (I think they may be under-pitched, but don't know so won't
start the rumor)
    My 16.5 x 12 really was a most excellent prop....till that ground
loop...

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

----- Original Message ----- 
From: "Anthony Romano" <anthonyr105 at hotmail.com>
To: <discussion at nsrca.org>
Sent: Tuesday, March 30, 2004 10:53 AM
Subject: Re: YS Engines

> Call, email and write to APC to start producing the 15.75 three blade in
the
> 11 and 12 inch pitches we could use. From what Dave has told me the
> repitching isn't hard it is finding a pitch gage. Haven't tried them but
> Bolly or Mejlick(sp) make 16*11 three bladers. Haven't heard positives on
> their performance over the repitched APC.
>
> Anthony
>
>
> >From: vicenterc at comcast.net
> >Reply-To: discussion at nsrca.org
> >To: discussion at nsrca.org
> >CC: "David Lockhart" <DaveL322 at comcast.net>, <discussion at nsrca.org>,
> >Subject: Re: YS Engines
> >Date: Mon, 29 Mar 2004 23:02:12 +0000
> >
> >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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