OS 61SX-H WC vs YS 61 ST

OS 61SX-H WC vs YS 61 ST

Post by Rockie Rope » Wed, 25 Nov 1998 04:00:00



I would like to know the differance between these two motors.

1. Hourse power.
2. Qulity.
3. Best performance.
4. Weight.

I would like to know how everyone likes these motors.

--

          ,\\\|///,
        *| #  # |*
  oo0---(_)---0oo

Thanx Rockie.

 
 
 

OS 61SX-H WC vs YS 61 ST

Post by STEPHEN ILBER » Thu, 26 Nov 1998 04:00:00


I have 2 of the YS61ST's and like them alot.  They have plenty of power and
don't requite much fiddling with the needles once you get them initially set
up.  Can't comment on the OSWC though, except that I've heard they make lots
of power, but you have to fiddle with them a bit more.  The OS can be used
with a pipe to get a bit more power, but with even more tweaking needed
then.  But the YS can't be used with a tuned pipe.  I haven't seen the need
to bother with one though.
Quote:

>I would like to know the differance between these two motors.

>1. Hourse power.
>2. Qulity.
>3. Best performance.
>4. Weight.

>I would like to know how everyone likes these motors.

>--

>          ,\\\|///,
>        *| #  # |*
>  oo0---(_)---0oo

>Thanx Rockie.


 
 
 

OS 61SX-H WC vs YS 61 ST

Post by XSNX » Thu, 26 Nov 1998 04:00:00


I have not owned the new YS61, but I had one of the original YS61 heli engines.
The new crop is very  popular with top flyers. The original engine did not make
the horsepower the new ones do. Overall, they are a "set it & forget it"
engine. Idle and transition are excellent. Power is very strong. A good choice
in powerplants.

With regards to the OS... I currently have two OS 61 SX's and one SX-WC. There
is a reason I only own one "WC" motor. I will not buy another. Let me preface
this by saying the SX is THE BEST 60 size motor I've ever had. Absolutely
INCREDIBLE power Very smooth and very consistent. The only complaint I have
is... to get the midrange and top end smooth, it must be run rich on the
bottom. This only presents a problem when the engine is cold. I have to squeeze
off the fuel line (basically regulate fuel) until it's warmed up. After
hovering for a moment, it will transition from idle without any problems, even
after idling for several minutes. With regards to the "WC"... this motor has

delivered very lackluster power. I must have tinkered with the midrange and
high speed needle valve a dozen times a flight  for the first couple of months.
However, the motor has started to run much better with more flights and fuel
through it. It's now producing good power and it's fairly smooth, but not as
good as my original SX motors. Other guys I've spoken with at competitions have
indicated inconsistencies with the motor, whereas others have experienced no
problems. In my mind, the jury's still out on the WC motor, but my credit card
IS NOT.

 
 
 

OS 61SX-H WC vs YS 61 ST

Post by Mark Kine » Fri, 27 Nov 1998 04:00:00


Hi Rocky, I have two OS61SXWC engines and Two YS 61ST engines and 1 YS
61ST-2

The two older version YS engines are very smooth and produce good power, but
the power is less than that available from the SXWC's.

I have one SXWC on a nitro pipe with a long header and it produces a lot of
power and is very dependable. This engine is also very smooth and I think is
almost as smooth as the YS.

The other SXWC is on a Hatori SB-9 and is much happier with a variation in
needle settings and is very smooth from rich to peaked. There is no doubt
when you lean to the point of detonation as the fuel starts to foam, but
with proper mixture it is smooth...even if rich. (the nitro pipe version
burbles and causes a tail kick when rich)

The YS ST -2 Produces more power than the old YS and is equal in power to
the sb-9 equipped SXWC, but is not quite a match for the nitro piped SXWC.

I only have about 3 Gal through this new YS so time will tell as I get more
fuel through it. It may be as powerful as the SXWC with nitro pipe once
fully broken in.

I am running 30% cool power in all of these engines and the power
comparisons are all in Futura SE's. I have also run the sb-9 engine in my
Millennium.

Thanks, Hope this helps.... Mark Kiner

I would like to know the differance between these two motors.

1. Hourse power.
2. Qulity.
3. Best performance.
4. Weight.

I would like to know how everyone likes these motors.

--

          ,\\\|///,
        *| #  # |*
  oo0---(_)---0oo

Thanx Rockie.

 
 
 

OS 61SX-H WC vs YS 61 ST

Post by WalterR8 » Sat, 28 Nov 1998 04:00:00


Mark, I run an old YS in a futura and like it. It's smoother than the old OS
(non WC) in my xcell but not a powerful.

I am curious : what gear ratio do you run in the futura, and headspeed?

Also want to thank you for your advice on the Arcamax interface. If the wind
dies down, (now that the rains have stopped) I hope to try it out today.

walter Roettinger

 
 
 

OS 61SX-H WC vs YS 61 ST

Post by Mark Kine » Sat, 28 Nov 1998 04:00:00


I am running about 1820 for aerobatics on the Futura with the SXWC and nitro
pipe.

Head speed on the YS ST-2 is about 1750

Head speed on the YS ST is about 1700-1750

Gear ratio stock 9.29
I have a 8.8 gear setup, but have not used it.

I am running 1700 in the Mille with the SXWC and SB-9

Gear ratio in the Mille is 9.29

Glad the info. on the Arcamax helped.

Mark Kiner


Quote:
>Mark, I run an old YS in a futura and like it. It's smoother than the old
OS
>(non WC) in my xcell but not a powerful.

>I am curious : what gear ratio do you run in the futura, and headspeed?

>Also want to thank you for your advice on the Arcamax interface. If the
wind
>dies down, (now that the rains have stopped) I hope to try it out today.

>walter Roettinger