OS 200
11-25-2008 | 01:21 AM
#151
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From: Bellevue, WA
RE: OS 200
OS 200 w pump works great with a Mejzlik 18x8 carbon fiber prop. 8400 rpm @ sea level. 12.5lb Extra with unlimited vertical. My YS 1.40 flew great with a apc 17x8. But the OS has more pull & runs much smoother.
Rick.
Rick.
11-28-2008 | 08:17 PM
#154
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From: Center of the Flyover States,
RE: OS 200
Rick, do you think the OS200 would develop more useable power if the crankcase vent hose to the carb were removed from the carb and just vented to the outside? THe carb hole/port would have to be closed up, of course. Seems like more fuel would be burned and power produced without all of that extra oil going through the combustion cycle.
11-29-2008 | 12:02 AM
#155
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From: Bellevue, WA
RE: OS 200
If it is the pump version no. If non pump version I'm not sure. The carb may need the pulse signal from the crank case to opperate. You can allways try it & comare tacometer numbers. Rick
11-30-2008 | 04:09 PM
#158
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From: Center of the Flyover States,
RE: OS 200
Possibly so, but flying conditions might vary causing the flow of oil to also vary? I probably wouldn't risk the engine and reduce oil content. I know the recirculating system does reduce the mess, but Saito does not do this.........so I wonder if it robs power. A couple of hundred rpms with an 18 inch prop is significant.
I will do some experiments next spring.
I will do some experiments next spring.
09-18-2009 | 06:07 PM
#159
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From: UK, UNITED KINGDOM
RE: OS 200
I have the OS200S version, pulls my EMP/YT fw-190 (15lbs) around the sky with ease, only scale flight of course, no prop hanging lol 
but has plenty of power for fast fly bys, loops and so on
only had a few flights. so still a bit tight, but have tacho'd an 18x8 graupner G-sonic at 8,500 so far......would expect a few more rpm after its run in?
cost over here is the same as a saito 180, thats why I bought it, bigger engine, same price.....same power, more torque.
anyway, I am pleased with the way it flys.....so far
but has plenty of power for fast fly bys, loops and so on
only had a few flights. so still a bit tight, but have tacho'd an 18x8 graupner G-sonic at 8,500 so far......would expect a few more rpm after its run in?
cost over here is the same as a saito 180, thats why I bought it, bigger engine, same price.....same power, more torque.
anyway, I am pleased with the way it flys.....so far
09-20-2009 | 08:53 AM
#160
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From: Center of the Flyover States,
RE: OS 200
Well 8500 RPM with a 18x8 is pretty damsel good!
I looked in my references and that matches what a Supertiger 3250 puts out with a 18x8 and equates to 18.9 pounds thrust (per the reviewer at that time). What nitro are you using? Being in the UK I suppose your elevation is quite low which also helps. But over 18 pounds is great.
I like your FW190. Have you parked it hiding in a hedgerow in France circa 1944? That prop looks good on that big round cowl.
[8D]
I looked in my references and that matches what a Supertiger 3250 puts out with a 18x8 and equates to 18.9 pounds thrust (per the reviewer at that time). What nitro are you using? Being in the UK I suppose your elevation is quite low which also helps. But over 18 pounds is great.
I like your FW190. Have you parked it hiding in a hedgerow in France circa 1944? That prop looks good on that big round cowl.
[8D]
09-20-2009 | 09:25 AM
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From: UK, UNITED KINGDOM
RE: OS 200
ORIGINAL: GarySS
Well 8500 RPM with a 18x8 is pretty damsel good!
I looked in my references and that matches what a Supertiger 3250 puts out with a 18x8 and equates to 18.9 pounds thrust (per the reviewer at that time). What nitro are you using? Being in the UK I suppose your elevation is quite low which also helps. But over 18 pounds is great.
I like your FW190. Have you parked it hiding in a hedgerow in France circa 1944? That prop looks good on that big round cowl.
[8D]
Well 8500 RPM with a 18x8 is pretty damsel good!
I looked in my references and that matches what a Supertiger 3250 puts out with a 18x8 and equates to 18.9 pounds thrust (per the reviewer at that time). What nitro are you using? Being in the UK I suppose your elevation is quite low which also helps. But over 18 pounds is great.
I like your FW190. Have you parked it hiding in a hedgerow in France circa 1944? That prop looks good on that big round cowl.
[8D]
I am using Optifuel 20%MV FS mix, and yes we are almost at sea level here in south lincolnshire
Yes it parked in hedgerow, camo netting just taken off ready to fly
I did think about a 3 blade prop, but thought I would stick with the 2 blade for now, plenty of pull is nice
07-26-2010 | 11:40 AM
#162
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RE: OS 200
ORIGINAL: TOLSOF
ok guys.
thats my story from greece.
i run this engine on my qq yak 54 73'' with a 18-6w apc prop.
as a result the engine runs grate on the ground but... on the air at full throtlle it kind of misses or stals or sounds like running too lean.
ok. i take it down to the ground turning the needle to enrich the mixture and on the air again. result...not enough power.
running a 20-6 wooden prop, elliminates the problem but climbing is redused.
trying different fuels (nitro percentage) did not notice any diference.
on the ground 18-6w showed 8400 and 20-6 showed 7400 rpm.
[&o][&o][&o][&o][&o]
i just can not get the power out of this engine.
do you think i should try a 18-8 prop??? since 18-6 (in my opinion) causes the float valve faenomenon.
helpppppppp.......[&o][&o][&o]
by the way what is the valve clearance for this engine since there is no reference in the manual??
i have to admit one thing....... idle is the best i have ever experinced in a 4 stroke engine.....just great.
ok guys.
thats my story from greece.
i run this engine on my qq yak 54 73'' with a 18-6w apc prop.
as a result the engine runs grate on the ground but... on the air at full throtlle it kind of misses or stals or sounds like running too lean.
ok. i take it down to the ground turning the needle to enrich the mixture and on the air again. result...not enough power.
running a 20-6 wooden prop, elliminates the problem but climbing is redused.
trying different fuels (nitro percentage) did not notice any diference.
on the ground 18-6w showed 8400 and 20-6 showed 7400 rpm.
[&o][&o][&o][&o][&o]
i just can not get the power out of this engine.
do you think i should try a 18-8 prop??? since 18-6 (in my opinion) causes the float valve faenomenon.
helpppppppp.......[&o][&o][&o]
by the way what is the valve clearance for this engine since there is no reference in the manual??
i have to admit one thing....... idle is the best i have ever experinced in a 4 stroke engine.....just great.
Oriole
07-27-2010 | 09:56 AM
#164
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From: Center of the Flyover States,
RE: OS 200
Well, so far so good with my OS200 mounted on an UltraStick 1.20 lite. But I have a Cline regulator managing the fuel flow and all is great in that department. Engine runs smoothly at all throttle settings except very low where it thumps along but keeps going.
11-14-2010 | 03:11 PM
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From: UK, UNITED KINGDOM
RE: OS 200
have you guys checked the valve clearances, mine had opened out to quite a large gap, was down on power so checked them, on re setting the gap to between 0.05mm - 0.1mm and shes back on song again turning a 20x8" at 7300 rpm
11-14-2010 | 08:15 PM
#167
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RE: OS 200
ORIGINAL: Flyer95
Theoretically, with the OS recirculating system less oil would be needed in the fuel. Or what do you think?
Theoretically, with the OS recirculating system less oil would be needed in the fuel. Or what do you think?
09-24-2011 | 09:35 AM
#168
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RE: OS 200
Well two years down the line of ownership and the engine is not as good now 
3 months ago i had to replace the valves, push rods, followers and cam, two weeks ago the con rod snapped. just replaced the it and rebuilt it, lets hope it runs a bit more reliable now?
Simon
3 months ago i had to replace the valves, push rods, followers and cam, two weeks ago the con rod snapped
. just replaced the it and rebuilt it, lets hope it runs a bit more reliable now?Simon
09-24-2011 | 11:52 AM
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RE: OS 200
ORIGINAL: Texan
Simon,
Can you provide some info on your flying habits? It would help us understand how much running time and what environment the engine has experienced. Also, what fuel are you using?
Thanks
Simon,
Can you provide some info on your flying habits? It would help us understand how much running time and what environment the engine has experienced. Also, what fuel are you using?
Thanks
the engine is used maybe 5 flights on a flying day, and thats once or twice a week, all year round, so hot weather and cold winter whehter, with the mixture adjusted accordingly.
The engine has been runnnig on Optifuel 20%mv 4S, which has 20% oil of 275 centistrokes.
Simon
09-29-2011 | 03:25 AM
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From: HUNTSVILLE,
AL
RE: OS 200
Mine is in a Great Planes SU-31 and runs great almost unlimited vert. with not a gallon run through it yet the idle is a little high but I think that will get better and I use 30% syn.
