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05-23-2007 12:29 PM  13 years ago
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MRMOOG

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Underneath a Blonde Bimbo

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OS50 vs YS50
Are there any advantages/disadvantages with these engines? I'm looking to put one in my Raptor 50. Which one would you go for? and why. I would be grateful for any help making a decision between the two
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05-23-2007 12:38 PM  13 years ago
Tyler

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Chicagoland area

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YS 50
quieter ( I know this is an unexpected benefit, but true), powerful enough for giant Blue Angels type loops and 3D pulling 12 degrees of pitch, much smoother, consistent is an understatement. Super easy to start and idles fantastic.

Tyler
Enjoy things that money can buy IF you don't lose the things money can't buy.
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05-23-2007 02:05 PM  13 years ago
Rotormax4

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HKT

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The 90's is Godsent.
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05-23-2007 02:15 PM  13 years ago
dose

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Glenville, NY

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So far I am loving my YS. its smoother and constant. I am using a regular raptor pipe while i wait for the mp5 to come out. And the power is just as good as my hyper with the JK Pipe just more constant.---
Vibe 50
Predator MAX Carbon
Adirondack Modelers
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05-23-2007 03:27 PM  13 years ago
nivlek

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Norfolk England

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Spares availability , should you need them , would be much better with the OS .At the end of the day , it gets dark .
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05-23-2007 03:28 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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The YS is more expensive and will eat rear bearings just like the YS.

They produce about the same power.

The YS is usually set and forget as far as tuning.
Andy
AMA 77227
http://www.jaxrc.com
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05-23-2007 03:44 PM  13 years ago
DS 8717

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Yes but it doesn't eat pistons like the OS.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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05-23-2007 07:21 PM  13 years ago
Andy from Sandy

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UK

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Also with the YS you wont be circulating burnt gases that eat your clunk tubing and the mixture settings shouldn't change as the tank empties.
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05-23-2007 09:03 PM  13 years ago
smity777

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California

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SO the YS has been going through bearings as well?
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05-23-2007 09:13 PM  13 years ago
DS 8717

rrProfessor

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all engines require bearings as maintaince. helicopters are hard on engine bearings.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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05-24-2007 12:39 AM  13 years ago
Chuckie (RIP)

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Crofton Maryland

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The YS50 has recently been introduced in the US as a full production unit so unless you are one who has a few months or year experience running the motor I don't think you can say if the YS50 bearings will last long or not. I know a few people in the US did purchase the YS50 last year so maybe they can comment on the subject of bearing wear. But then I wonder if YS changed the bearing from the ones produced last year.

Charles
Please stand by for faster service!
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05-24-2007 03:28 PM  13 years ago
BarracudaHockey

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Jacksonville FL

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The bearings are the same and there's a couple at our field that have had them a while.

The quote was "I babyied it while there were no parts, as soon as they started importing them and I had confidence in the parts supply leaned it out a bit and started flying it hard I had to replace the bearings not too long after" JaxRotor May 07

My point is not to dog the YS, its a great little motor but its just another 50 size heli motor its not a magic bullet.
Andy
AMA 77227
http://www.jaxrc.com
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05-24-2007 03:37 PM  13 years ago
DS 8717

rrProfessor

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The YS 50 has a few more advantages to it than the OS 50,so right now it is probably the motor of choice.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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05-24-2007 03:48 PM  13 years ago
MRMOOG

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Underneath a Blonde Bimbo

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For a novice at tuning like me, do they give you factory setting to start from? As tuning is a art all to itself in my bookAlcohol may leave you wondering what the hell you did with your bra and panties.....Burrp!!
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05-24-2007 03:50 PM  13 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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It's a 2 needle carb just like the OS and is set the same way. It should have the initial setting with the manual.because of the pressurized fuel system the fuel mixture wont change with the fuel level,one of the advantages of the YS over the OS.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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05-24-2007 03:51 PM  13 years ago
Tyler

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Chicagoland area

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YS 50
One advantage to the YS 50 is the fact that the mixture will not go any leaner than the initial settings at the beginning of the tank. All of my non-pumped OS engines must be set slightly rich for full tank so they lean into a smooth powerful mixture by the end of the tank. The YS would not need this practice. Setting an OS perfectly with a full tank could cause damage by the end of the tank.

The previous post indicates that someone had a bearing failure with a YS 50 after turning in the needles. There is nothing saying that the engine wasn't run TOOOOO lean when putting it through the wringer. I don't find that a fault of the engine.

Also, those engines purchased a year ago have a completely different carb/regulator assembly. Reports have been posted that they didn't run consistently from tank to tank or day to day. I would find this to be reason enough to throw the older YS 50's with some time on them out of the "control group" of longevity. I believe we will have to wait and see what happens with the current USA version of the YS 50 to determine their long term service.

I will say that my rich YS 50 is stilling pulling much better than my non-hyper OS 50 ever did. I didn't own a hyper, but I am clear on that when I post my personal experiences/comparisons. I do believe, however, that many folks are having various troubles with the Hypers.

Tyler
Enjoy things that money can buy IF you don't lose the things money can't buy.
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05-24-2007 05:43 PM  13 years ago
jaxrotor

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Jacksonville FL

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Just to clear this up abit:
The bearings were changed after about a year of use. This was before the parts had become available.The bearings needing replaced had nothing to do with a lean run!After testing several different pipe/muffler and mixture settings the MPII worked the best for me.

What is the difference in the carb/reg? the only difference that I have noticed is the fuel inlet plate at the regulator,which doesnt make any change in the way it operates.

I did take it easy on the engine until parts became available,then when using a limiter with a 100% across the board,I had a sensor failure and the engine over speed causing the rod bushing/bearing to fail.Not the engines fault I just didnt catch it in time.
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05-24-2007 07:19 PM  13 years ago
Tyler

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Chicagoland area

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jaxrotor
Thanks for clarifying this for us. It sounds like your bearing replacement is not an indication that the YS 50 is prone to bearing failures without a known reason. The OS do still simply go through bearings regularly from normal use.

Tyler
Enjoy things that money can buy IF you don't lose the things money can't buy.
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05-24-2007 07:21 PM  13 years ago
link

rrApprentice

Gautier,ms

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YS
I have been running YS engines for about 20 years now to included 4 strokes and 2 strokes. The OS helicopter engines 60 and above in my opinion are the worse you are always working the needle valves. The YS has always been set it and leave it. I'm not a hard 3D guy but I have YS engines that are 4-5 years old and I have not had to do anything to them. I had a YS engine that I just sold to a friend mine (YS120AC) that has been in its box for the past 10 years and on the second flip is was running and he has not touched the needle settings that were set 10 years ago what does that say for YS engines. I just got the new YS50 and I'm sure it will last a long time as all of my other YS engines. The OS50 hyper is a fine motor and I have not had any issues with as of yet but for me the YS motors are the best for power and reliability. " YS, there is no other"
Enjoy the day for we know not what tomorrow holds
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05-27-2007 12:37 PM  13 years ago
EERIE

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Seletar, SG, Singapore

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I was hoping to find a thread about these 2 engines. After todays funfly fly i have to decide on my next engine. I had always thought that the next engine after my TT 50 would be an OS 50 Hyper..and a friend at the field advice me to pick the YS. So here i am trying to find out more about the engine. My TT have no problem starting but after 1 year old, i think its time to upgrade move on and tear the skies. So the YS 50 it ll beRAPTOR 50T
T-REX 250/450SE/500ESP
9XII(2.4)
Its all fun & games till the bill comes
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