YS Engines

[David Lockhart]

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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