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HelicopterEngines Plugs Mufflers Fuel › OS answers YS with a small but sharp uppercut.lol...
12-04-2011 03:52 AM  5 years agoPost 21
unclejane

rrElite Veteran

santa fe, NM, USA

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>It took OS 6 tries to get the 91 right,lets see how long the 105 takes.Some of the OS 91 's were real vibrators even after 3 tries to get it right.<

It looks pretty good in Bobby Watts' whiplash as-is to me... Could be they learnt a good bit with the .91's and so had a leg over already when it came to the 105?

And it's not like there's not a bunch of YS 91 revisions either. Took them a while too .

Now all I have to do is wear out my .91 HZ-R's and I'll have an excuse....

LS

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12-04-2011 04:46 AM  5 years agoPost 22
rexxigpilot

rrProfessor

Florida

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Modern, ringed nitro engines don't need many flights for break-in. Using 3 flights, 8 minutes per flight and the 1.04" stroke length, the ring in Bobby's engine has already traveled 11.6 miles along the cylinder walls. That should be enough for complete break-in.

I like the velocity stack and the return to the blue head. I do wish it was a bit larger dispacement though. My 91's will have to do for now. I need more power improvement over my 91's to cough up that $530 purchase price, then spend another $200 on a muffler. The new engine must be detuned as it's displacement went up 15% but power only went up 9% compared to the 91.

If I was looking to get a new engine for a 90 class heli, it would be a hard pick between the OS and YS. But as the saying goes, there's no replacement for displacement! And both being the same price (at least right now) makes the YS 120, with 21% more power than the 105, look pretty good.

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12-04-2011 05:52 AM  5 years agoPost 23
cudaboy_71

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sacramento, ca, u.s.

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looks nice. but, these guys are pros at collective management.

the only test for ME is to get that head loaded up and try to bog it.

i've seen TJ flying the YS120 in person several times. prolonged high-collective and/or high-cyclic circuits and reversals with virtually no change in headspeed (or engine sound).

i'm not saying the OS is NOT the business. i'm just saying i need to see some flights in the hands of us mortals before passing judgement. if that thing can throw around 710s with sloppy left stick, all without breaking a sweat, then it might start to get the salavaries going.

if it ain't broke, break it.

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12-04-2011 06:13 AM  5 years agoPost 24
haha

rrApprentice

Woodstock,GA

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not that much of a different from a ys 91sr 3ds
http://www.youtube.com/watch?v=c-yoMwuVZ6U

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12-04-2011 06:22 AM  5 years agoPost 25
gotnoclue

rrApprentice

sydney

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$530 purchase price? only $450 from where i got mine, $650 for motor and hatori shipped, pretty good price in my books, plus the offset from selling my current motor and pipe.

as has been said though i have seen 91's look unboggable in some peoples hands but i have also seen the 120 be both unboggable and die in the ass as well. all comes down the the end user and how they tune the motor plus how good there collective managment is, i can aieleron tictoc all day sometimes but kill it others being heavy handed.

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12-04-2011 11:18 AM  5 years agoPost 26
DS 8717

rrProfessor

Here wishing i was somewhere else

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>It took OS 6 tries to get the 91 right,lets see how long the 105 takes.Some of the OS 91 's were real vibrators even after 3 tries to get it right.<

It looks pretty good in Bobby Watts' whiplash as-is to me... Could be they learnt a good bit with the .91's and so had a leg over already when it came to the 105?

And it's not like there's not a bunch of YS 91 revisions either. Took them a while too .

Now all I have to do is wear out my .91 HZ-R's and I'll have an excuse....

LS
If they used the fuel system which they FINALLY got right it should be a great motor.Yes YS has a few versions but each version was an improvement and this is/was not always the case with OS.Dont get me wrong the newest OS 91 is a great motor and also how does the 105 run on 15% nitro which would be less sterss on the motor than 30%.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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12-04-2011 11:24 AM  5 years agoPost 27
DS 8717

rrProfessor

Here wishing i was somewhere else

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Modern, ringed nitro engines don't need many flights for break-in. Using 3 flights, 8 minutes per flight and the 1.04" stroke length, the ring in Bobby's engine has already traveled 11.6 miles along the cylinder walls. That should be enough for complete break-in.

I like the velocity stack and the return to the blue head. I do wish it was a bit larger dispacement though. My 91's will have to do for now. I need more power improvement over my 91's to cough up that $530 purchase price, then spend another $200 on a muffler. The new engine must be detuned as it's displacement went up 15% but power only went up 9% compared to the 91.

If I was looking to get a new engine for a 90 class heli, it would be a hard pick between the OS and YS. But as the saying goes, there's no replacement for displacement! And both being the same price (at least right now) makes the YS 120, with 21% more power than the 105, look pretty good.
And it runs great on 15% nitro, although when the demand for 15% nitro goes up the price of 15% will increase ESPECIALLY if its a specific blend for a cerian motor.OS tend to break in quickly but unfortunanetly they wear out quickly and new ring replacment more frequently.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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12-04-2011 01:56 PM  5 years agoPost 28
unclejane

rrElite Veteran

santa fe, NM, USA

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>Dont get me wrong the newest OS 91 is a great motor and also how does the 105 run on 15% nitro which would be less sterss on the motor than 30%.<

I believe it's setup to run on 15% only like the YS120. I would assume Bobby W. is using 15% in that video?

That said, I too would be skeptical that the 105 has _more_ power than the YS120. It is a smaller engine. Depends on what they've done with port timing and so on. But it could be really close or perhaps even the same?

I personally would lean toward it for other reasons, tho, mainly because it's slightly more oversquare than the YS, which means it may be smoother. And since it's smaller in displacement, it should be easier to start with less damage to the start shaft assembly in whichever heli I'd use it in (probably a trex 700).

My flying style is n00b (takeoff, round the pattern, land without a crash is a good flight), so I don't need a lot of power. my 91HZ-R on coolpower 15% is plenty for me, even at my 7000' altitude. But at the low rotor speeds I run, a little more grunt would be nice.

LS

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12-04-2011 02:39 PM  5 years agoPost 29
rstacy

rrElite Veteran

Rochester, NY

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OS tend to break in quickly but unfortunanetly they wear out quickly and new ring replacment more frequently.
Wow. I didn't know that. I certainly don't agree with it. Kyle gets 3+ years out of an engine without doing a ring or bearings. Even then it still runs strong but by that time something new has come along. I'm sure it has a lot to do with the way an engine is run and cared for. Fuel has a huge impact on the life of an engine.
Whats your definition of "more frequently"?

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12-04-2011 02:50 PM  5 years agoPost 30
bkervaski

rrElite Veteran

Birmingham, AL, USA

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OS tend to break in quickly but unfortunanetly they wear out quickly and new ring replacment more frequently.
This simply isn't true.

Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels

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12-04-2011 03:32 PM  5 years agoPost 31
unclejane

rrElite Veteran

santa fe, NM, USA

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>OS tend to break in quickly but unfortunanetly they wear out quickly and new ring replacment more frequently.<

I'll join the other guys in calling BS on this one. I've not yet succeeded in actually wearing out an OS heli engine. And I'd bet my prospects for doing that to my current 91's are pretty slim too.

You can do it with lean runs, overheating or using a fuel with not enough oil in it (virtually impossible to find these days), but in normal operation they seem to last forever.

It is true about the breakin. By the 4th or 5th tank, you're most of the way there. On a .91, after the first gallon, it's pretty much good to go....

LS

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12-04-2011 03:36 PM  5 years agoPost 32
billybob

rrVeteran

Torrance, CA

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Yea, the O.S life span is very good. I agree, it's all in how you run and care for the motor..and, the care taken when breaking-in.

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12-04-2011 03:42 PM  5 years agoPost 33
rstacy

rrElite Veteran

Rochester, NY

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Thats what I thought guys.
DS clearly doesnt like OS and that OK. You cant please everybody.
But posting bogus info about the product is just wrong...even if you are a rrProfessor

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12-04-2011 03:58 PM  5 years agoPost 34
bmapope

rrVeteran

TN

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totally agree rstacy!!
I still fly a 3 year old os91hz with the back plate plugged running muffler pressure and haven't touched the innards! run mine sloppy rich all the time. as everyone here should know it is about collective management, but i believe that art is gone now with flybarless and electrics.

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12-04-2011 07:26 PM  5 years agoPost 35
helidevil

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Brunswick, ME

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i think that guy got it backwards...OS engines are tanks! IMO YS makes better power when loaded as opposed to OS, but if you have a lean run in a YS, they're done. OS you just richen up and go fly.

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12-04-2011 08:05 PM  5 years agoPost 36
BobOD

rrElite Veteran

New York- USA

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Hmmmm. Decisions decisions. I've been itching to see what even more power would be like in my 600. Next season is going to be a lot of fun.

Team POP Secret

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12-04-2011 08:25 PM  5 years agoPost 37
McKrackin

rrProfessor

Lucasville,Ohio

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The need for a $270 pipe on either of the big engines is my only stumbling block.

Maybe I'll get a used one soon when one of y'all get tired of feeding your big block

The engine prices are OK but add the pipe...

The OS is $499 and $529 but the only OS pipe for it is $269

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12-04-2011 09:17 PM  5 years agoPost 38
unclejane

rrElite Veteran

santa fe, NM, USA

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Ive always used Curtis pipes for exactly that reason. They've always had good performance for a fraction of the cost. I'm using an MP 7 on my 91 HZ-R and it runs great. About $160 instead of $200+ for others. Hopefully CY will make an MP for the new big blocks too.

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12-04-2011 09:36 PM  5 years agoPost 39
JOLT

rrVeteran

Baltimore, MD

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I was there during the flight! That motor is scary powerful.

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12-04-2011 09:59 PM  5 years agoPost 40
hotrodvigor

rrApprentice

Tampa Bay Florida

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DS 8717 Hit it right on the money, alot of guys on these sites were not around when OS was struggling at our expense, The c spec was going to be king and it was King of flops, one lean run and it was trash,the 46 had less power then the 32, in fact OS was in so much trouble the 32 was the only good engine they built, then came along the 50 that needed bearings after 10 flights, I lost track of how many Turd 90s OS built, I did buy 2 hz after letting the guys try them out and they are good engines hands down! I will do the same with the 105 and 120 I will let the mass test them for me so guys pull your credit cards and hurry I need to know!! and to be fair I remember when the ys 80 and then the 90 was blowing out the case wall before ys got it right, I like them both but with os I can run a crank sensor.

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Scorpion Power Scorpion Power
HelicopterEngines Plugs Mufflers Fuel › OS answers YS with a small but sharp uppercut.lol...
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