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08-14-2013 12:56 AM  7 years ago
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devin120

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Canada

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YS 120 vs OS 105
Not to start a war but for smack 3d has one been decided king. Ive had my head in electrics for awhile.
Miniature Aircraft - OS power - Futaba electronics
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08-14-2013 02:58 AM  7 years ago
Zbawer

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Singapore

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OS or YS 90 size will do "smack 3D" just fine ...
From my personal experience I just think OS is easier to tune, more reliable on the long run ...
Maybe that one YS 91 SR engine I've had in my career was form a bad batch but it gave me lots of troubles. When I had it dialled in thought it was making awesome power ...
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08-14-2013 03:25 AM  7 years ago
dodgeboy

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slidell, LA

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i wonder this also, is bigger better ? i have a 105 and tossed up between a 120 and 105. i just heard the ys motors were harder to tune and as someone new to nitro i went with os for no other reasonEmpire hobby, Gaui USA, OMG servos, Cyclone Blades
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08-14-2013 03:49 AM  7 years ago
unclejane

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santa fe, NM, USA

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The 120 is approaching the limits of what you can fit in that size crankcase and form factor, so my main worry about it would be vibration. But I've not run one so I may be wrong about that.

I have a 105 that's been in 2 helis, a trex 700N (may it R.I.P.) and now my Whippy nitro. All I can say at the end of a flight on the walk back to the table is "whaaaat an engine!...". It's a total sweetheart of a motor in terms of dealing with it, starting, tuning etc. and doesn't seem to vibrate much harder if any than a .90.

It's a little smaller, same bore as the old 1.08 FSR plank motor and a slightly longer stroke than the .90. So it won't hammer as hard as a 1.20 might...

LS
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08-14-2013 02:03 PM  7 years ago
dodgeboy

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slidell, LA

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ive had a guy tell me he has a ys 120 in his align 700. he said the motor hammers so hard that every 12 to 15 flights he need to change his boom cause it starts to cracksEmpire hobby, Gaui USA, OMG servos, Cyclone Blades
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08-15-2013 12:48 AM  7 years ago
BONO1

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AR

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I'm glad my 120 doesn't hammer like that!

Sam
blow smoke
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08-15-2013 10:55 AM  7 years ago
cabeng

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South africa

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Ive seen a 120 shake booms apart , but i think it is from the power it makes , but a good decent boom brace on and you wont have a issue , run the ys a touch rich , say keep under 90deg just under the head and you will have a very good reliable performing motor , I still love my 105 though , makes plenty power on the coast !!

if you looking for a new motor though , seriously consider the ys91 srx , Tareq edition , powerhouse of note and easy to tune , Just read the book, its carb (like all ys motors) are built and tune differently to the std carbs we are all used to like what is on the OS motors!
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08-15-2013 01:03 PM  7 years ago
unclejane

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santa fe, NM, USA

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I'm not sure I see a justification for the Tareq, tho, IMO. That's going down in displacement for more money - it's over $500 at Horizon, for example. That doesn't make sense financially to me.

For that you could get a 1.05 and you'll spend the same on a pipe. It's a bigger motor with likely the same or more power. Or you could get the 1.20 for _less_ money. Even I would get a 1.20 instead, even tho I'm an OS guy.

On the other hand, it looks like the 1.20 isn't doing well in the market. Or seems that way, it's getting steep discounts at a couple places I've looked.... So it may get orphaned soon.

LS
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08-15-2013 01:26 PM  7 years ago
Dr.Ben

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Richmond, VA, USA

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A 120 that breaks parts like that has been mistuned or otherwise run on the wrong fuel. Be that as it may, I know for a fact that OS investigated a displacement larger than the 105 and opted against it because of the practical realities of making that large a displacement engine run acceptably smooth and be noncritical in tuning for a helicopter application. If you look at the overall success of the 105, I think OS made a wise choice. And please, this is not a Ford versus Chevy post. All I am saying is that there is a break point in heli engines where the nitro smoothness that we expect will wane with successive increases in single cylinder displacement regardless of how much weight you hang of the other end of the crank counterweight.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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08-15-2013 01:39 PM  7 years ago
unclejane

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santa fe, NM, USA

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Agreed and that might be what happened with the 1.20. Basically, that's a 1.20 size engine in what's a .61 size form factor. You have to go back a few years to see where the mounting dimensions and overall size were standardized, but basically what we run now came off .60-.61 size motors.

That said, that doesn't mean we can't keep boring em out and seeing where that limit is. I agree on the 1.05 as it's virtually as smooth as my .91 HZRs that it replaced. Obviously there's a little more vibration, but it's still pretty manageable and it doesn't buzz my nitros apart. They only die when I drill them into the ground lol....

So it may be, repeat may be, sensible for YS to go back down to the .91 size in this case. But OS has put them between a rock and hard place with the 1.05, IMO.....

LS
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08-15-2013 03:37 PM  7 years ago
cabeng

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South africa

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Very interesting topic , 500us sounds very steep indeed
http://www.goblinhobbies.co.za/nitro/ys-engines.html R3800 , bacically translates to $380 us
ive been told but have no idea if true or not that with Tareq's help , YS is having a re look at their 120 motor now that the 91 is launched and running well , Who knows ?
I own the os 105 and love it , it just goes and goes and goes!!
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08-15-2013 04:08 PM  7 years ago
Kinger

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Granville, OH

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YS91 Tareq is shown at $429 via another US on-line retailer. As for power, if the posts of owners are to be believed, it is on par with the 105.
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08-15-2013 04:33 PM  7 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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I have used both,i found it is easier to tune the YS engines when you know how the needle valves function.As far as vibration the 120 has heavy metal in the crank to balance the engine,if yours vibrates its not tuned right or something in the clutch or fan hub is out of balance..I have the YS 60 now and its very smooth,it also has heavy metal in the crank for balance.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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09-04-2013 08:23 PM  7 years ago
kvnm27

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Charleston SC US

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...back on topic, the 105 is a monster for big INCREDIBLY FAST air! But is it more smackable than a 91? I dont really think so, but thats my opinion. I think a 91 does just fine. but thats me!
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