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OS engines users Club

Old 01-26-2006, 05:47 PM
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Tom, there is all the difference in the world in the OS SP and any of the YS engines. They are both 4 stoke engines but that's about it.
The OS runs a smaller prop as mentioned above and turns a much higher rpm, maybe 2000-2500 higher. The OS has a pump and regulator but does not pressurize the fuel tank at all where the YS can easily cause a tank rupture if steps aren't taken. The OS runs around 10,100 in the air while the YS is in the low 8,000's.

The easiest way to tell if an airplane is running one or the other: if it smokes at full throttle it is a YS, if it smokes at low throttle it is an OS.

With either, if you lean it too far it will throw the prop and spinner right off and destroy both in the process. Both need a minimum 15% fuel, preferably a pattern blend (oil content) and I've seen both running like homesick angels on as much as 40%. I don't know what else to tell you bit will be happy to answer any questions. You know how it is, getting older and forgetting what it is I thought I knew.

Rick H.
Old 01-26-2006, 06:28 PM
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Default RE: OS engines users Club

Rick, thanks for the reply!

What I was getting at, or thinking I was getting at (lol...) was "is there a profound difference in the way the two engines are tuned"? It seemed to me you were saying the SP needs a very lean needle (3/4 open) and I was guessing that the YS needs a fat needle? Maybe I am way off base here.

Anyway, no matter as I do not own a YS yet. But I do have an SP and so when I get around to running it I have your excellent notes to work from!

Thanks,
-Tom
Old 01-26-2006, 09:20 PM
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Default RE: OS engines users Club

Rick and I are going to be working together tomorrow, I'll tell him that you responded.

Enjoy,

Jim
Old 01-26-2006, 09:54 PM
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Well, is there an award for the newest member of the OS engine users club? I only have one OS. The new .46AX bolted to my Ultrastick.

Still running the same prop from break in, 11x6 APC. Can cruize around at 1/2 throttle and never miss a beat. Just starting to run in more and get more flights in. Starting to do some basic tricks and the engine has been flawless so far. Not one airborne dead stick. But I am still on the rich side and flame outs during taxi to take-off have happened in the colder temps. But I don't blame the engine, just my newbe tuning skills. I time my flights from start up to landing at 12 min and have fuel left over.

The .40 size Ultrastick with the OS .46 AX is a great combo for anyone looking for a plane after a trainer. This technically is my glow trainer. I have flown electrics so I'm not an absolute beginner. But the first time the 'stick lifted off was a thrill. And having such a reliable engine is a major plus.

See ya,
Rod
Old 01-26-2006, 10:07 PM
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I don't have any experience with the AX directly, just what I've seen. There was a young pilot out at the field here in Texas the other day wringing out his trainer. That thing was fast and would do really big loops. I asked one of his friends what engine he had. The reply was a .46AX. Welcome to RCU Rod.
Old 01-26-2006, 10:20 PM
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I've only seen one AX. I helped the guy start it and set the needles. He took off and the airplane did a big loop and hit beside him. He said it destroyed his engine but I didn't look to see what was broken.

I don't think he did a field check on his radio before he took off?

Enjoy,

Jim
Old 01-26-2006, 10:49 PM
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The .46AX on my 'stick is plenty fast enough for me. If the wind holds off this weekend I will try and get some tach readings. I have half a gallon through it so far. So it will only get better. Temps are supposed to be mid 50's so it will be great for flying, as long as the strong winds stay away.

Been reading on RCU for awhile. Just thought I would share my info on this new engine.

See ya,
Rod
Old 01-27-2006, 06:10 PM
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ORIGINAL: w8ye

He took off and the airplane did a big loop and hit beside him.

Enjoy,

Jim
At least it was a big loop. It takes power to do that, even once!
Old 01-28-2006, 04:43 AM
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Default RE: OS engines users Club

HI!

Till now I had:
40 SF with tuned muffler (I bought it in 1999 then I was his 3rd user, i sold it 4 yers ago, running till today awsome!)
60 FP
91 FX
91 SX Acro Sport

I never had any problems.
Power, Stability, Quality.
My next glow motor will be a 1.20 AX.
Old 01-28-2006, 08:13 AM
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xcarlos, the 91 SX Aero is not available in the U.S. What is the difference between the 91FX and the 91SX?
Old 01-28-2006, 04:51 PM
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What is the difference between the 91FX and the 91SX?
A lot.
Cylinder Liner, Piston, Piston Ring, Connecting Rod, Needle are the same as by the 91SX-H C-Spec.
So it is nearly a heli-motor.
It has a little more power, torque than the FX and runs more balanced.
With Cool Power 5% nitro, 14x10 APC, standard muffler it can turn ~8400RPM
(with tuned pipe about 10400).
I want to use it in a F3A trainer about 1,7m span.


Old 02-08-2006, 08:33 PM
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ORIGINAL: Harry Lagman

Tim, you're right - I got a significant improvement by fitting an aftermarket thin walled header, but to my .91 Surpass 2 pumper. The .91 exhaust port uses an 11mm thread.

I was working on a friends .91 Surpass today. He wanted a 1 inch extension added just before the bend in the header pipe. I had never noticed before but at the factory they had partially collapsed the tube while bending it. This is pretty sloppy tube bending. The same pipe is used on the .91 as the .70, so an already borderline exhaust flow is further compromised by this poor bending job. Also the wall thickness looks like over-kill. I can see why Harry got a boost when he changed headers.
Old 02-08-2006, 08:58 PM
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Default RE: OS engines users Club

Hi Guys,

In reply to RCHOTROD, You ain't the newest member. As of today, i am. I've been away from glow engines for years (running big imported gassers), but after retiring (semi) to sunny Florida, I decided to scale back a little as far as size goes. I just today took delivery of my new O.S. FS 91SII to put into my new Hangar 9 P-47 Jug. I have a question or three. Is there any special caution to observe when breaking in this new fine jewel? (other than at least 18% oil with castor content, and not running it lean and not running too small a prop and not lugging the engine down)? As I said earlier, It has been years since I owned one of these small engines, and truthfully, I think I have forgotten what I ever knew about them. At least I did remember to buy an O.S.

[8D]
Old 02-08-2006, 09:43 PM
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balsabandit, I'll try this again. I had a long reply typed out and was about to hit OK, when my computer crashed. Welcome back to slimers. I broke in the .91 I was talking about in the above post by carefully following the instructions in the manual. It's a strong running engine. My friend is putting the finishing touches on a Flyin' King and will power it with this motor. I think I remember using a 13x8 for break-in.
Old 02-09-2006, 02:43 AM
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Ηι all!
Two days ago i received my New OS 65 LA engine!
What a jewel.....[X(]
I own a one year old OS 46 LA also,which is installed in my trainer.
Also i have a NIB OS 91 FX that is going to be installed in my Hangar 9 F4U-Corsair.
I will install my engine at "9o'clock",so the big muffler to cum out of the bottom side of the cowl.
So, i will not ruin the scale look of my "Whistling Death"!
Hehe!
Old 02-25-2006, 05:18 PM
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Here's a new kid on the block. It's a Bruce Thorpe Flyin' King powered by a .91 Surpass. Notice the thrifty and artistic using up of odd rolls of covering. That really is a .91; the Flyin' King is so big it makes it look like a .30.
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Old 02-27-2006, 01:11 PM
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Hi
Pls i need some helps, for choice OS engine.
i have to scale 2500cc(120kn) engine with 1/5.

How can i do that??
which engine i have to buy??
Old 02-28-2006, 12:10 AM
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ORIGINAL: TimC

ORIGINAL: w8ye

He took off and the airplane did a big loop and hit beside him.

Enjoy,

Jim
At least it was a big loop. It takes power to do that, even once!

-------------


A friend of mine just got back into flying again after a ten year layoff. He was flying a Nextar powered by an OS.46AX. He is a former YS and Webra man, so when he says the .46AX is a great engine, I believe him. I haven't had the privilege of messing with one as yet.
Old 02-28-2006, 12:31 AM
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ORIGINAL: AirJohn05

Hi
Pls i need some helps, for choice OS engine.
i have to scale 2500cc(120kn) engine with 1/5.

How can i do that??
which engine i have to buy??
You want a 1/5 scale 2500cc engine? I don't think you want a 500cc engine!

Perhaps the O.S. FF-320 flat four?

http://www.osengines.com/engines/osmg1320.html

Old 04-10-2006, 12:51 PM
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G'day,
I bought an OS 40FP when they were new back around 1990'ish, I had it in my trainer then in a Diabilo, the motor went into a river while installed in the Diabalo, and when I found it, I pulled it out, stripped it down, cleaned it up, and for nearly 15 years it sat in a small bucket in parts until I picked up the hobby again,..I put the engine back together, primed it and bugger me if it didn't start on the 2'nd flip, OS engines are great I love'em!,

I have just bought a FF 240 Pegasus, can anyone tell me the history of this engine?, are parts still available? and what should I expect from it, It has been run for a total of around 9 Hrs, and I plan on putting it in the GP Christen eagle.

Thanks
JJ[8D]
Old 04-30-2006, 01:06 AM
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g'day I own a 91 70 52 and a 30 all os my fuel mixture is 5% nitro 12% castor oil and the rest methanol I have run all my engines on this for many years and never had a problem
Old 05-01-2006, 03:34 AM
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OS all the way baby!!!

OS 91FX
OS 91FS
OS 1.08FSR
2. OS 1.20FS
They ALL start with just a back flip or two and almost never need the HS needle messed with. Just fuel,flip fly.

Pat
Old 06-01-2006, 09:31 AM
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My OS collection -

15 RC
25 RC
30 RC
35 RC
40 RC
40 FP
60 FSR
61 FSR
61 SF x 2
61 RF-P Hanno Special x 2
FS - 70 FL
FS - 120 E
FS - 120 SP
BGX - 1 35cc 2 stroke

Still own all but 1 61SF, the BGX-1 & the 120SP. All sold in models.

120SP was nothing but awesome!!!! I did 1700 flights, only time it came apart was after a big hit around 900 flights which bent pushrods & crankshaft. Put new bearings in while it was apart. 15x12 APC at 8900rpm on 20% nitro & 20% coolpower oil with a slight mod to the exhaust & both valve chambers.

I wish I still had this motor.
Old 06-01-2006, 09:16 PM
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I've got a few oldies.

25FSR x 2
45FSR x 2
H40S
H60FGR

They all still run well enough after many years that I have absolutely no reason to update them. Just means that I've never had the chance to experience OS's newer offerings![]
Old 06-01-2006, 10:04 PM
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I'm also returning to flying after a long dry spell ( 12 years ). Right before I stopped I bought a 46FX and and a 32SX thinking that they would some day replace one of my two old 46SF's and a 32F. ( I finally ran the 46FX as mentioned below, the 32SX is still new in the box ).

I recently finished ( Last night ) a PC-9 and in preparation for it, ran three 8oz. tanks of 15% through the 46FX ( 18% synth/castor mix, I added another 4% castor ). It tached @ 12500 with an APC 10x6 running rich, I'll worry about real numbers after she's safely broke in.. BTW, that's with a Mac's black muffler on it.

I did end up drilling a hole in the ground with one of 46SF's mentioned above while living in San Diego those many years ago. It was attached to a nice Royal Bearcat done in Blue Angels of the era.. I still get soggy eyed about it. The only engine I've managed to destroy ( Wish I could say the same regarding airframes )

I've only owned O.S. 2 strokes. Life is simple. I like it that way..

Bill


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