I will.
Andrew: What is exactly the function of the crankcase breather connected to the carburetor assembly as it comes from factory? I noted that my friend connected the cranckcase breather to the tank using a check valve.
Thanks for helping.
Alfred

Today bench run 10% nitro
APC 16*12 7900
APC 16*13 7700
Engel 18*11 7500 (Engel 18*11 is a narrow bladed carbon prop)

Conclusion for now. Not such a great engine.
My laser 200 V-twin did on the same day with the same fuel on these props 200rpm more.

Hans,

What is the weight and price of the Laser 200 V-twin?

460 pounds and 1230gr mufflers included.

that is about US$950... Then I rather go for the OS 200FI instead...

Sorry, but that is not the point. It is not that the laser is a better buy.
I only expected a single to do better (power-wise) then a v-twin with the same displacement.
It did not, and that is my disappointment. I hoped this engine would be a inexpensive alternative for a engien in a pattern ship, but it is not up to that task.

Hans,

Myself are looking for an engine to my 25% Extra, flying weight guestimate 11 lbs. It's Laniers old full build kit so it is not a 3D plane. However I have made several weight reduction steps and are looking for an engine that is low on nitro (expensive in Europe as you know) and will give it rocket performance.
You have this all new engine at hands, do you think it is a good choise for my application, or do you recomend me to go for YS 160/170 instead?

Sorry hit the wrong key. And now the door-bell rings. Be back soon

This one I expect.
http://www.lanierrc.com/lrcprivate/r...a25percent.htm

Rocket & low on nitro & low weight to keep it flying well. I think the saito180 and this OS200 are still the best options.
YS will be more rocket like, but if this will be your more ten ten fligths per weekend ship the fuel costs will be not what you like.

Or maybe the Saito 2.20. It will probably run fine on 5% fuel like the other Saitos.

Thanks for the advice.
Yes that is the kit I am building.
High nitro fuel is both a hustle as I would need to mix it myself as well as it is expensive in Europe. This is the reason why I am hoping for good reviews on the OS 200. Obviously the OS200FI would be great but I will never pay that price.
The Saito 220 is too heavy. I am trying to keep the wing load light.

i'm in the same boat as you. about 11 pound plane. like the sound/torque of a four. wieghs 1.5lbs less then the gas. more torque then the 1.60. but not near the hp as a gas. its just that weight. with the glow i can put redundancy stuff in my plane and not worry about weight. wouldn't be talking about this if i would have got the yak. wing loading is rated a lot higher. so i'm in a dilema.

Saito220, 180 or OS200 should all give excellent performance for that size and weight but must be used with the correct prop size.

They dont like to be loaded down to 7500rpm at peak like a 50cc gasser. At +8500rpm and they should pull these planes like rockets.

These are the props I would use for good performance with that size fourstroke glow engines 17x8, 18x6, 18x8 or 19x8 for the 220.

Hans,

How does the OS160FX compare on those APC props you ran? I am only familiar with APC 18X6W and 18X8W rpm values. I am looking to get an idea of the power comparision between those two engines.

There was a website dedicated to pattern engine setups, props, pipes, and rpm data but I have either lost the website or it has been deleted.

from what i've read.. they're very close. however.. i would think the two stroke needs to spool up to get the horsepower. midrange power might suffer briefly. the four stroke can throw larger props. the tachs taken on the 200 show that it can throw an 18x8 at the same rpm as what the 1.60 thows a 16x8. the tachs also show... if you throw a 16x8 on the 200.. it gets up close to 9000rpm. 8400's with an 18x8. 1.60 plus a pitts costs 330. and weighs 32.8 without muffler. probably about 35.8ish with. the 200 weighs 30.7 with stock muffler. which seems to be very manipulative. and you get four stroke sound.. ease of use after break in. usually no needle valve adjustments etc. i'm leaning towards the 200 if i don't go with a gas.

I have a well piped (KS1025) 160FX on a pattern ship too. The two stroke does about the same as the laser on the ground, but can handle a bigger (in this case a 17*12 APC) better than the laser can. The laser does a bit better in rpm with the 16 inch APC's.

In horizontal flight the 160FX speeds up very wel and there I like the characteristics of the piped 2 stroke better. The dynamics of the plane look better. However if the climb rate is more than 45 degrees the Laser is performing better because there is never a rpm change up or down. Downlines with a 4 stroke are a lot better because of the breaking.

The OS200 I only tried it bench running. To me the power was disappointing however it only has seen two tanks of fuel. A well piped FX160 will do better then the OS200. A muffled FX160 will not do better then the OS200

if i used the 160 i would be using a pitts. i want hover and pull out performance. what's your thoughts.

Hans,

Thank you for the reply. It sounds like the 200 is a winner if it can spin a 18X6W or 18X8W at a higher rpm than the 160FX especially considering the weight reduction compared to the much heavier Saito 2.20.

I'm still very interested in the fuel consumption of the 200 compared to the 160FX, one of the most fuel effecient engines I have ever used.

If the 200 can spin a APC 17X8W @ 9200 rpm on 5% nitro and run for 5 minutes 20 seconds it will be on par.

I have mounted an OS 200 on a 74" Extreme Flight Yak and all I can say is WOW ...What a fantastic combo...Not sure of the exact weight but it'll be all of 11 lbs.

I am running it with a Mejzlik 18/8 @ 8600...Fuel consumption is very very low...It pulls this plane around like a rag

I have run Saito engines for years but I really like this engine...Very quiet, smooth and seems to be be quite powerful

Wingerburner,

How much nitro and oil are you running? Do you use fuel with some castor?

Wingburner,

What engine mount do you use? Do you experience much vibrations? Where is your tank mounted?

I am building a kit with a finishing target weight of 11 lbs, and are looking for unlimited performance. Considering your experience it seams I have found a winner.

Skypilot, I am using Cool Power High Performance Heli 30%...Not sure if there's castor in it...It's what I already had for my Saitos'.

Rate I am using the glass or nylon one that was supplied with the kit...There is some vibration, but no more than expected with an engine of this size...I believe it's smoother than the Saito 180 i had..The fuel tank is mounted ahead of the wing tube, with it being at least 6" behind the carb...Absolutely no fuel draw problems at all..Don't know if it's needed but I am using large fuel line.

I might add it starts extremely easy at an idle with a starter...I have not tried hand starting it yet.

Thank you for the reply. Cool Power is straight synthetic. I was wondering what the power output would be on 5% nitro. I guess until the nitro factory blows up again I won't find out.

You would be using 0% nitro if the plant blew up.

I had posted a bunch of prop/rpm figures earlier for 10%, 15% and 30% - going from 10% to 5% will IME drop you maybe 100 to 200 rpm at the most.

AJC

Morgan's 30 Heli Cool Power has 22% all synthetic oil to my knowledge.