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HelicopterEngines Plugs Mufflers Fuel › NEW OS 1.05 Heli Engine
12-04-2011 09:49 AM  5 years agoPost 21
sky'

rrApprentice

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Hi,

YS is a little bit to tricky.
I have sold all my YS engines (from 50er-91er).

Now i have only OS Engine and i have again order a new OS.
It is a OS Max 105 HZ-R + OS 105 Powerboost Pipe + Futaba BPS-1.

Flying with OS = Flying sans souci

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12-04-2011 10:34 AM  5 years agoPost 22
sky'

rrApprentice

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Damn, this engine has Power and he run so smooth....

OS Max 105 HZ-R + OS 105 Powerboost Pipe

Watch at YouTube

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12-04-2011 11:12 AM  5 years agoPost 23
DS 8717

rrProfessor

Here wishing i was somewhere else

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Hows the power on 15% nitro.Less nitro means less stress on the motor.

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

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12-04-2011 02:52 PM  5 years agoPost 24
NitroAl

rrApprentice

Gold Coast Aus

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LMAO Bobby cracks me up!

Read this little review by Gaven Broadbent http://www.archeli.com.au/forums/sh...098#post1445098

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12-05-2011 03:28 AM  5 years agoPost 25
knightofcarnage

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chicago

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Looks like its should be here in late december.

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12-05-2011 05:53 AM  5 years agoPost 26
Dr.Ben

rrMaster

Richmond, VA, USA

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Power aside, take note of the consistency of mixture while Bobby was beating on even this a new engine. I think guys will find that there was a real method to OS's madness with this choice of displacement and overall design.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-06-2011 02:04 PM  5 years agoPost 27
unclejane

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santa fe, NM, USA

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>Power aside, take note of the consistency of mixture while Bobby was beating on even this a new engine. I think guys will find that there was a real method to OS's madness with this choice of displacement and overall design.<

That's another good thing about the OS - their regulator system is a real coup. After all the pump arrangements that I've never seen work right, OS really came up with a good working fuel delivery design on this. On my 91 HZ-R, the mixture stays utterly spot on from full tank to empty. In fact, it's so consistent it's down in the noise of operating temperature. my 91 is a little blubbery when cold, then cleans up after about 1 min. in the hover. Then it remains exactly as-is until the tank is literally dry. I've never been able to observe that with any engine previous to this one.

At least, that puts it at parity with the YS engine line, which has had the advantage of their (reportedly) excellent pressurized system for a long time now.

There's been some discussion about the OS vs YS big block designs in the other thread too - overall I think OS made the right call on the displacement and bore/stroke. Don't know how they compare in terms of power, but the OS looks like a more reliable design to me.

LS

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12-06-2011 03:23 PM  5 years agoPost 28
Zaaaguy72

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MN

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Competition wise, can the pros compete with either engine, or does it have to be a .91 size?

Team Sanjel!

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12-06-2011 03:34 PM  5 years agoPost 29
DS 8717

rrProfessor

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I dont believe OS came up with the regulator design,i believe they copied the OMI system James oneil developed that everybody used that wanted their engine to run right.Even if i cost $150,they were willing to pay that for the carb modification and regulator.Theres more to that story than people are willing to talk about.I know James quit doing the mods when i talked to him a while back.The HZ-R is the only OS helicopter engine in the 60 to 91 size that has ever ran consistantly.The 105 will probably be a fine engine and enough power for most people....

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

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12-06-2011 03:44 PM  5 years agoPost 30
unclejane

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santa fe, NM, USA

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>Theres more to that story than people are willing to talk about.<

Not me. If you get me started on OS's crappy carbs prior to the current regulated ones, you'll have to carry me out to shut me up.

>I know James quit doing the mods when i talked to him a while back.The HZ-R is the only OS helicopter engine in the 60 to 91 size that has ever ran consistantly.<

I agree. It's the first OS carb that I've been able to set, have it give good mixtures all up and down the powerband and literally not touch again for gallons and gallons. Prior to the "ODR" carbs, full throttle was about the only setting that wasn't too lean or rich, or moved all around same .

I've heard the regulator was an, er, adaptation of an existing design - I hope whoever it was is getting royalties for it. It works really well.

LS

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12-06-2011 03:57 PM  5 years agoPost 31
DS 8717

rrProfessor

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The regulator james used was a cline regulator,but he had to modify the carb for it work.He also enlarged the bore on the early ones to give more power. I put one of those on a OS 50 hyper and it didnt give it more power but it sure ran more consistant.

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

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12-06-2011 09:41 PM  5 years agoPost 32
sky'

rrApprentice

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Hi guys,

i am really impressed from the power of this brand new power engine.

Look next video!

The heavy Raptor 90 G4 (with Futaba CGY-750) flies as light as a feather.

Pilot Kyle Stacy:

Watch at YouTube

Regards,
Gottfried

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12-08-2011 01:44 PM  5 years agoPost 33
unclejane

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santa fe, NM, USA

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One other thing that I'm kinda, sorta seeing starting to show up in various places. Not sure if there's anything to it, but it's something to watch - the 120 seems to be a little fussier about fuel. I.e. Rotor Rage 15% seems to have the "special formulation" for it. It also reportedly has trouble with higher nitro fuel, a problem if you do want to go that way.

So that has me scratching my head just a little bit - what happens if you use another non-"special formulation" fuel over the long term? Any drawbacks? Who knows....

This has always been an advantage of OS for me, they've never been cranky about the fuel. I don't think there's a "special formula specifically for OS engines" fuel even on the market anywhere (to my knowledge anyway, I may be wrong) . You can dump practically anything you want into them as long as it has enough oil in it and has the desired nitro content. Beyond the usual tweaks you might have to make to the mixture, there's no "special formulation" you have to use for it to last it's normal service life or perform the best.

But again, with the 120, I'm just going on heresay. It may be the case that any ol 15% with enough lubricant in it works fine and this isn't even noteworthy. But the special-formula-for-the-120 thing from Byrons raises my eyebrows a little bit....

LS

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12-08-2011 02:09 PM  5 years agoPost 34
AaronJohnson

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mason,MI

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Nothing special about it...its the same lubrication package as 30% masters...just in 15% fuel.

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12-08-2011 02:15 PM  5 years agoPost 35
unclejane

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santa fe, NM, USA

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Ah, ok, good to know. Next, I wonder if they'll come up with an accomodation for higher nitro fuel? I.e. a way to lower the compression ratio?

LS

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12-08-2011 02:20 PM  5 years agoPost 36
DS 8717

rrProfessor

Here wishing i was somewhere else

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From what i understand it is set up for 15 to 20% nitro out of the box,unlike the OS HZ which also comes set up for lower nitro but come with extra differnt size shims you have to use for the higher nitro fuel.I didnt read the instructions that came with OS HZ but it states you need to add shims depending on the brand and nitro content you plan to use. i used mine out of the box and was using Curtis 30% fuel and had a hard time setting the needles,it was too critical to set the needles and after i read the instructions and added the extra shim or shims i dont remember how many i ended up using but it was much easier to set the needles. I imagine you would have to lower the compression on the YS 120 to use 30% if you want/need the extra power,but 15% will probably have enough power for most people.I have found some fuels even with the same nitro content will tune different,when i switched from Curtis to Cool Power i had to set all the neeldes including the idle mixture.

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

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12-08-2011 02:22 PM  5 years agoPost 37
DS 8717

rrProfessor

Here wishing i was somewhere else

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Nothing special about it...its the same lubrication package as 30% masters...just in 15% fuel.
Is it the same amount of oil or is the oil content lower than the 30%.I am thinking about switching to Byrons 30% fuel for my current helis.

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

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12-08-2011 02:27 PM  5 years agoPost 38
unclejane

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santa fe, NM, USA

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imagine you would have to lower the compression on the YS 120 to use 30% if you want/need the extra power,but 15% will probably have enough power for most people.
Yeah, this is kind of like the "nobody will ever need more than 640K" statement from Bill Gates back in the IBM PC/DOS days -
Restricting your choices by telling you you don't need to have that choice is generally a bad strategy, Customers normally simply go to the competition that does offer the choice instead. Then you're playing catchup when you do have to regain those customers again later with a fix. So this is bit of a worry off the bat.
I have found some fuels even with the same nitro content will tune different,when i switched from Curtis to Cool Power i had to set all the neeldes including the idle mixture.
Yep, that's normal for any engine....

LS

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12-08-2011 02:53 PM  5 years agoPost 39
Four Stroker

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Atlanta

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I'll third that - CY and CP totally different setup. Not even close.

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12-08-2011 02:57 PM  5 years agoPost 40
DS 8717

rrProfessor

Here wishing i was somewhere else

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I remember when minature aircraft told us we dont need more than 8 degrees pitch and any more than that would stall the blades......

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

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HelicopterEngines Plugs Mufflers Fuel › NEW OS 1.05 Heli Engine
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