I want a power upgrade for a pattern plane. I currently have an old YS 1.20NC and was looking at a YS 1.40 Sport.

I realize the 1.60/1.70DZ engines are the very best out there in terms of power.

However, is the OS 200fs a valid replacement for the 1.40 sport?

I think the OS will give me the capability to swing huge props (15x12 3-blade, 18x10 - 20x8, etc) on slightly less expensive fuel (15%) for similar power to the 1.40 on 30%, weighs about the same or less, and also costs a bit less than the 1.40. Maintenance on the OS should be minimal, similar to the .91 and 1.20 Surpass. I would like a simple, light, powerful plug-and-play system.

Any comments?

Thanks!

Brett

So far I have not seen or heard of a single person running the OS 200 other than Jason who ran one for 1/2 flight last year at the NATS. Not sure why nobody is running it but they are not.

Why not OS 140RX or for that matter OS 160. The OS140RX is the most reliable straight forward glow motor going.

17X12 or 18.1X10 prop on 15 to 20 percent nitro. Definitely adequate through Masters.

not too fast, I like the 4-strokes a lot. YS in Europe is not much of an option. Expensive to run on 30% nitro and unless you have people around that understand them, they can be a nightmare.

It would be nice to see an alternative. Unfortunately Saito does not offer yet anything. I would be interested to hear about experience with the FS in pattern.

Joe, thanks for the info. I had a big response typed up and the computer froze.

That 1.40rx is definitely a great engine. I love the performance of the big OS 2-strokes on 5% - 15%. I had a 1.60 with mixed results due to the Pitts muffler (deadsticks), but it handled very well. I especially loved the 12+ minute flights on 14 oz of fuel. I could probably get a NIB 1.60fx, bearing, pump, pipe, header for about $500 or so.

The 1.40RX is an excellent option too. It has two problems though. It requires that I purchase a full-length pipe ($160 - $275) and it requires that I install said pipe (long pipe tunnel). I see the engines for sale from time to time used, but buying new will cost as much as a 1.70DZ.

On a side note, I am interested to see if OS follows suit and releases a big AX series engine (1.80AX? 200AX?)

My plane has a short pipe tunnel for the short 4-stroke pipe. I want a relatively plug-and-play option. I know the 2-strokes will blow it away on power, but power is adequate and it is easy to live with and costs $399.

Maybe as much as the DZ without its exhaust system<g>

It's funny more times than not you get what you pay for.

Hi Brett:

In my field, a good friend purchased the 200 and is a wonderful engine!!!!

Power wise, is about the same as the YS sport, as he told me.

Grate engine!!!!

Hector

So power wise you are saying it is close to the power of a YS 1.40 Sport??!? Wow, for the money and weight (almost 2 oz heavier) I would have at least expected it to be close to the 1.70DZ. Who would want that?

Ron Barr in Texas is running the OS 200 FI and it is incredible. Power to the MAX.

Chuck

Robbidos,

I don't understand what you are saying. The OS weighs 1.5 oz more with the stock mufflers, and a little more than an ounce more (40 g) than the YS without mufflers. The OS costs less than the YS too. Reports I have read place the power in the same ballpark as the YS 1.40 sport, but on 15% instead of 30% fuel, with the added capability of swinging a much larger prop more like the 1.60fx. The OS 4-strokes I have owned


Chuck, it is my understanding the 200FI is "supercharged" similar to the YS. Too bad they don't make a carburetted version with the pump and supercharging.

I've never heard the example of using 200fs to F3A. But I recently hear that a few pilots began to use the new 200fs-p for F3A in Japan. As you know this type has much power(5% plus) than normal 200fs. However I am not certain if this choice is appropriate or not.

Best regards

Srashina

Srashina, I expect the pump version (200fs-p) will be available in the US soon. It is good to know it has more power than the standard version, thank you for your input!

Actually, it weighs 3.5oz heavier (31.75oz vs 35.27oz, neither with the muffler) than the 140sport and costs 3 times as much ($429 vs $1299) as the 140 sport. It is 1.5oz heavier than the 170DZ and it is only $690. Why on earth would anyone use it if that is all it can put out power wise?

You are looking at the fuel injected model ($1200). I refer to the carburetted version ($399), here: http://www3.towerhobbies.com/cgi-bin...?&I=LXPRL4&P=0 . The pump version should be about $60 more and weigh a little under an ounce heavier. The 200fs weighs 32.8 oz and the 1.40 sport weighs 31.75 oz.

As far as power, the 200fs-FI version is supercharged similar to the YS engines and is supposed to be very powerful, although very expensive. I agree I would not use that engine.

I am wondering why everyone says they have so many problems with YS motors. I currently have 6 of them and have no problems
other than with a used 140l that I purchased that I sent back to YS and they replaced the piston and liner under warranty. I must say I have the YS engines that people say are the most problemmatic the 140l and 2 120sc motors that are power houses and run like champs. I had one of the sc motors for atleast 6 years before I put it into service (scare of all the bad things that I had read) but since I put it into service I have purchased 5 more and love them they take no longer than than any other motor to setup just be patient and take your time. I got rid of all my 2 strokes except 2. I live in Germany and you are right the 30% is outrageously priced
but what can I guy do?



Jeff
Luv them YS motors

I'm using the O.S 200 FS in my new Lorenz Laser. See http://jonwold.blogspot.com
I'm currently mounting the engine and hope to break it in soon.
This is the unpumped version.

Ola Fremming has an EFI in an Oxalys, see http://home.online.no/~ofremmi/F3A/T..._fs_200_fi.htm

Thanks for the info Jon. It looks great in your Laser.

The numbers I have seen indicate the 200fs is roughly equivalent to the 1.60fx in power.

Ola's engine is a monster however. APC 17x12N @ 9000+ is very impressive, as is the 18x10 @ 8820.

I just noticed that Tower now carries the OS 200 fs- p pump version, but they are asking US$599 for it (the 200FS is $429). I thought it would be more in the $480 range and it may still get there.

Some japanese sites (ishiimokei) sell these engines and the pump version is only 4000 yen more than the non-pump version (Y49,245 vs Y45,270) which means the 200FS-P costs US$461 vs US$426 at today's exchange rate.

I can only assume Tower/Hobbico will lower their price on the pumped engine in the future? I would prefer to have a pumped/regulated engine but if I have to pay $599 for the 200FS-P from Tower, I may as well spring for the YS 170DZ for an extra US$90 and have more power than I currently need plus the legendary YS DZ reliability and without the usual YS pressurized fuel system (170DZ is pumped, not pressurized).

Any comments? Has anybody ordered from Ishii mokei? If shipping isn't too expensive I think will just get it from them.

Ironically Ishii Mokei's prices on the YS engines are exactly the same as Central Hobbies when converted to US$. I wonder why Tower/Hobbico marks up the OS engines so high?

OS 200FS-P: http://www3.towerhobbies.com/cgi-bin...?&I=LXUYX4&P=0
OS 200FS: http://www3.towerhobbies.com/cgi-bin...?&I=LXPRL4&P=0

OS engines at Ishii Mokei: http://homepage1.nifty.com/ishiimoke...ine/os_4st.htm

I installed a non pumped 200fs to my second hand F3A Sombrero. I used a self made "hyde" mount that was used earlier with 140RX. I had to make a new nose ring for that because 140rx one had a larger diameter hole. I used 200FI version Hatori header with a short YS version Hatori muffler that i happened to have in my stock. I needed to fit muffler and header with a short tube, because 200FI header does not fit directly to YS version muffler. Anyway YS muffler seems to be the same size that their 200FI version exept for header fitting hole so it should work ok. I also installed Perry oscillating pump to help fuel delivery.

This combination is now ready for break in. I'll test it soon and tell how it works.