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Introduction
The newest and largest in the Surpass line is a perfect power plant for any 1.50-1.80 size plane!
O.S Engine's latest addition to their FS series engines!
First LookOS’s new FS-200S came in the OS blue box with their usual quality packaging. As I unpacked the box, I was impressed with the finish and size of the new engine. There was no damage and the finish was perfect.
At first, I thought this couldn't be a 2.0 displacement engine. It was way too compact and light. Amazing!
Innovations
Here's a photo overview of this innovative engine:
SPECIFICATIONS
Quick OS 1.20 and 2.00 Comparison
I set my OS 1.20 FS on the bench next to the OS 2.00 to compare the size difference. Considering the 2.0 is almost twice the displacement, its compact size and similarity to the 1.20 footprint is amazing!
First Run
It was around 75 degrees when I arrived at my test stand. I bolted the engine to the stand, and mounted the Top Flite 18X8 I planned to use for break-in. I filled the tank with Byron 15% fuel and was ready to fire it up! After opening the high speed needle four turns, I spun the engine a couple times by hand to prime it and hooked up the glow driver. I thought I'd try my usual method of starting big four stroke singles of spinning the prop backwards against compression with a chicken stick. It immediately fired and kicked the prop nut loose enough to freewheel the prop! And believe me the prop was tight! I thought, "Ok, we won't be doing that again!” After re-tightening the prop, I hooked up my Sullivan Dynatron Starter. A quick bump of the Sullivan starter and the motor was purring. I followed OS's recommended break-in procedure of leaning the engine for five seconds, then richening it to let it cool. After four 10 oz. tanks, I leaned it out and checked RPM and transition. It was spinning the 18x8 prop at 7620 and idling smoothly at 2160. Transition was excellent! I never did have to adjust the low speed needle through all the test runs. I've owned and flown quite a few large displacement four-stroke engines., and all of them tended to vibrate and were rather noisy. Through all the OS 2.0's test runs, I was really impressed at how smooth and quiet the engine was for such a powerful large displacement single. My test stand is on the edge of a small patch of wood, and my son “assisted” me with the testing. He made the comment that the prop wash was moving the leaves on the trees 30 feet behind us!
RPM Readings
I always figure around two gallons of fuel for break-in for a four stroke engine before trying to achieve top RPM, and I usually assume performance will increase with each tankful of fuel. But the following figures were pretty impressive!
Sound Levels
Conclusion
The OS 2.00 is a powerhouse, on a small footprint with an impressively quiet muffler for its size! It's size and power makes it a good fit for a broad range of sport and scale models, and it should be another big seller for the already famous OS lineup.
Pluses:
Minuses:
I believe OS has just set the bar a little higher for large bore single cylinder engines. I sure can't wait to get her flying!! Last edited by Angela H; Jun 25, 2007 at 03:20 PM.. |
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Jun 28, 2007, 12:27 PM
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#2 |
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Grumpa Tom
Join Date: Sep 2003
Location: 5th & Main, Los Angeles, CA
Posts: 13,696
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Love the engine reviews! Keep 'em coming!
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Jun 28, 2007, 02:46 PM
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#3 |
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Right Honorable Member
Join Date: Jul 2003
Location: Chicago Midway, Illinois, United States
Posts: 516
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The review mentions a #4 and #8 glow plug. Does this engine not use the "F" plug?
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Jun 28, 2007, 03:31 PM
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#4 | |
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S.A.D. member
Join Date: Dec 2004
Location: Chicagoland, IL
Posts: 7,700
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Quote:
Ivan |
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Jun 28, 2007, 03:45 PM
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#5 |
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The sky is my playground.
Join Date: May 2005
Location: New Hampshire
Posts: 6,098
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Gotta love that sound of a four stroke! Please keep the engine reviews coming!
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Jun 28, 2007, 07:36 PM
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#6 |
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Registered User
Join Date: Feb 2007
Posts: 1,128
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I don't know where that guy has been but a Saito 1.80 on its worst day will slaughter that thing.
Saito 1.80 & APC 16x8==9,500 rpm Saito 1.80 & Graupner 16x8=9,400 rpm APC 18x6W==8,900 rpm Menx 18x6 on 10% nitro==8,600 My own lowly Saito 1.50 turns an 16x8 Graupner at 9,000 on 15% PM Last edited by I TOBOR; Jun 30, 2007 at 07:25 AM. |
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Jun 28, 2007, 08:46 PM
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#7 |
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Registered User
Join Date: Aug 2004
Posts: 9
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Where are the comparisons?
What good is an engine review without comparisons to competing products. How does it compare to the Saito 1.80 and 2.20? It's nice to know that it runs smoothly and doesn't make too much noise, but if I'm going to spend $500 for it, I want to know whether it is in the same league as the competition powerwise.
And if it isn't, you owe it to your readers to say so. Jim |
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Jun 28, 2007, 09:59 PM
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#8 |
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The reviewer
Join Date: Mar 2004
Location: Tokoroa
Posts: 3,600
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All reviews should include the following information:
1. was the engine purchased by the reviewer or supplied by the manufacturer or publisher? 2. if the engine was supplied by the manufacturer/tester, was it returned after the testing was completed or was the reviewer allowed to keep it? 3. What frames of reference does the reviewer have when drawing conclusions and rating the various aspects of the product? 4. Does the publisher accept advertising from the manufacturer or distributor of the product being reviewed? These, and many other factors can sometimes influence the outcome of a review and unless we know the facts we can't judge just how objective the review might be -- hence it is worthless. |
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Jun 28, 2007, 10:48 PM
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#9 |
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Canucklehead
Join Date: Apr 2004
Location: GTA, Ontario, Canada
Posts: 827
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I like what they've done with the muffler. Still, this engine is a little on the expensive side. A comparable gasoline engine such as the Evo 35GT2 is $50 cheaper and is also more economical to run. Even the Evo 26GT2 would work for models in that range and it's a full $100 cheaper. Once models get over 1.20 size, glow starts getting impractical simply because of the cost of fuel.
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Jun 29, 2007, 06:51 AM
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#10 |
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Registered User
Join Date: Feb 2007
Posts: 1,128
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My main concern is its obvious lack of power, nobody is going to spend $500 bucks for a 2 cu. in. engine with the power of a competitors 1.50 fourstroke.
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Jun 29, 2007, 07:39 AM
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#11 |
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Registered User
Join Date: Apr 2007
Posts: 6
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Os 200
Well i dont know what he did to get those numbers but mine did (After 2 gallons) 9100 on apc 18*8 (Jero Helimix15/20)
This cant be right or maybe a bad wolf??? |
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Jun 29, 2007, 09:20 PM
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#12 | |
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Registered User
Join Date: Aug 2004
Posts: 9
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Quote:
Jim |
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Jun 29, 2007, 09:41 PM
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#13 |
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Registered User
Join Date: Feb 2007
Posts: 1,128
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Well Jim, maybe its the oilless fuel he ran in it.
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Jun 29, 2007, 09:45 PM
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#14 |
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nooobama
Join Date: May 2004
Location: NE PA
Posts: 984
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I'm working on my first "big" plane now...a ultrarc katana and I'm putting a 36cc gasser in it. Why would I put a glow engine in it instead? I'm wondering where a glow would be better than a gas engine?
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Jun 29, 2007, 09:50 PM
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#15 |
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Registered User
Join Date: Feb 2007
Posts: 1,128
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With me its a personal preference, I'm putting a Saito 2.20 on a 12 foot Telemaster because it just seems wrong to have that big beautiful plane sound like a chainsaw.
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