OS .50 SX versus YS .63

I agree with Frank on his entire post.......especially since the YS is quite
a finicky engine, but I would strongly suggest you also consider an Irvine
.53 in the list of choices.......awesome power, mine turns an APC 12.25x3.75
prop at 13,500rpm! This is with the Tower Hobbies .46 muffler, never tried
the stock muffler yet but the tower muffler weighs less. I would bet the
Irvine (with this muffler) weighs less than the OS 50, but not sure.

Brad L.

> I am debating between these 2 engines. The OS is listed with a higher
> HP rating (1.8 vs 1.5) and it is less expensive, but I have never
> owned a 4-stroke and the 63 looks like a nice one. As far as
> performance, what differences can I expect between these two?

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Frank Costa - 29 Jul 2003 23:32 GMT

The Webra .50 is also a popular choice, though I think it's better suited
for high-speed applications, it loves to rev I hear. From experience and
second hand accounts, the O.S. and the Irvine are probably your best bets
for power and reliability in that range, I hear nothing but good things
about them. If you're set on 4-stroke, you may want to consider the Saito
.72, not quite as powerful as the YS, but simpler in operation. I've heard
great things about it.I'm not putting the YS down, but from what I've gone
through with this engine, I wish I'd waited until I had more 4-stroke
experience, that's all.

> I agree with Frank on his entire post.......especially since the YS is quite
> a finicky engine, but I would strongly suggest you also consider an Irvine
[quoted text clipped - 9 lines]
> > owned a 4-stroke and the 63 looks like a nice one. As far as
> > performance, what differences can I expect between these two?

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Ed Cregger - 30 Jul 2003 11:17 GMT

There is no primer for a YS four-stroke, Frank. Owning any other four-stroke
glow engine would not have provided you with any useful information. The YS
is in a league of its own.

I prefer two-strokes for that particular size range. They get along just
fine burning 5% nitro fuel and have no pesky diaphragms and other junk to
malfunction.

Ed, NM2K

> The Webra .50 is also a popular choice, though I think it's better suited
> for high-speed applications, it loves to rev I hear. From experience and
[quoted text clipped - 22 lines]
> > > owned a 4-stroke and the 63 looks like a nice one. As far as
> > > performance, what differences can I expect between these two?

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If you can afford the YS buy it. You won't be disappointed. I promise. Eddie
Fulmer

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I was not happy to hear of early bearing failure cuz I just bought one
a few weeks ago. It is a screamer. Starts great and has plenty of pull.
Turns 14000 on a mas 11x6. Only problem is that i cant make it go rich
with the needle valve way out at full bore. It does go rich up to half
throttle. Upon inspection of the needle valve I noticed a ridge in the
taper. Some doo-dah must have overtightened it. I burned out my second
glowplug since 1978 on the first tank of fuel trying to break it in. The
price seemed right. As a YS observer , I see gnashing and gnarling of
teeth over trying to adjust them sometimes.

> I am debating between these 2 engines. The OS is listed with a higher
> HP rating (1.8 vs 1.5) and it is less expensive, but I have never
> owned a 4-stroke and the 63 looks like a nice one. As far as
> performance, what differences can I expect between these two?

Reply to this Message

Courseyauto - 30 Jul 2003 13:57 GMT

I was not happy to hear of early bearing failure cuz I just bought one
a few weeks ago. It is a screamer. Starts great and has plenty of pull.
Turns 14000 on a mas 11x6. Only problem is that i cant make it go rich
with the needle valve way out at full bore. It does go rich up to half
throttle. Upon inspection of the needle valve I noticed a ridge in the
taper. Some doo-dah must have overtightened it. I burned out my second
glowplug since 1978 on the first tank of fuel trying to break it in. The
price seemed right. As a YS observer , I see gnashing and gnarling of
teeth over trying to adjust them sometimes.

Joel wrote:

I have the OS 50 heli version and had the rear bearing wear out in less than
20 flights. I replaced the bearing with a ceramic one and removed the webing
on the crankshaft that covers the bearing so it could get more lube to the rear
bearing. Motor seems to run a little smoother now so it must have also helped
the balance too.

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Please see a post entitled "Tiny Bubbles or engine won't run at full
throttle." I've got the OS 50 adn it has run pretty good for me, but lately
it's started "acting up" and it's only 6mos of flying old. It does seem to
be a good engine, but it's not like I've had no trouble with it.
Mark

> I am debating between these 2 engines. The OS is listed with a higher
> HP rating (1.8 vs 1.5) and it is less expensive, but I have never
> owned a 4-stroke and the 63 looks like a nice one. As far as
> performance, what differences can I expect between these two?

Reply to this Message

IMHO, there is only one engine in this size range and thats the O.S. .70
Surpass II. It's not the lightest, but it's not bad. It's not the most
powerful, but it's right up there near the top of sport engines in this
range. It IS however, the most user friendly engine I've ever had the
pleasure to own....and for that reason I've had three of them and I wouldn't
hesitate getting another if I had the need.

All you do is open the box. install the engine fuel it up (sometimes make a
minor adjustment to the idle) and go fly. I have a .70 Surpass II that will
easily hover my 6 lb Venus and punch out of the hover. I use 10% Cool Power
and O.S. type F plug and an APC 13x6 prop. I get 11,000 peak out of this and
I back off the needle to about 10,800. It's a awsome combination of power
and dependability at a reasonable price.

Say, did I mention that I like my O.S. .70? <grin>

Cheers,

Wiz

> I am debating between these 2 engines. The OS is listed with a higher
> HP rating (1.8 vs 1.5) and it is less expensive, but I have never
> owned a 4-stroke and the 63 looks like a nice one. As far as
> performance, what differences can I expect between these two?

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Model Forum / Radio Controlled / Air Models / July 2003

OS .50 SX versus YS .63