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O.S. 4 stroke gasser 40cc - 1/22/2013 4:41 PM   
vertical grimmace



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Status: offline 		Thought I would put this up as this engine certainly would be good for certain warbirds. Particularly WW1. Hopefully it will not be priced out of reach.

http://www.os-engines.co.jp/news/webdir/25.html

http://www.rcuniverse.com/forum/m_11278826/tm.htm

< Message edited by vertical grimmace -- 1/22/2013 7:12 PM >

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RE: O.S. 4 stroke gasser 40cc - 1/22/2013 11:32 PM   
alanc


 

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Status: online 		looks lovely,   price will be lovely too,   just to make a farting noise,  will it be a deeper noise than a glow motor?

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 12:59 AM   
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ORIGINAL: alanc

looks lovely,   price will be lovely too,   just to make a farting noise,  will it be a deeper noise than a glow motor?



Nope, but it will be making less power than a similar sized glow ignition engine.

My Saito 180 can swing an 18 x 8 prop @ 8450 (3.5 HP 21# thrust) on 15% Cool Power set off @ 34* BTDC.

Ran the nitro up tp 30% W/8% lube O'Donnell Speed Blend fuel & it made 8850 flashing to 9000 (4HP 32# thrust) on that same 18X8 prop.

Gotta love that 4 stroke sound.

I would say that that 12.77:1 compression 180 bellerin' on 30% nitro & methanol? That's a bit of a roar. I don't think a similar "gas" 4-stroke engine would sound so nasty.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 1:18 AM   
vertical grimmace



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Status: offline 		I loved my Saito 180, but hated feeding it! I am excited to see all of these new gas engines hit the market. 40cc is a good displacement for 1/4 scale WW1.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 3:15 AM   
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Status: offline 		I say for the folks that can afford it , put a few dollars more and get 50 to these. I think you will have a lot more power. I know I would if I had the bread. Sure not paying no 700 for an OS.

http://www.team-aeroscale.com/kolmsingle.html

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 4:02 AM   
SrTelemaster150



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ORIGINAL: 91zulu

I say for the folks that can afford it , put a few dollars more and get 50 to these. I think you will have a lot more power. I know I would if I had the bread. Sure not paying no 700 for an OS.

http://www.team-aeroscale.com/kolmsingle.html



Few can afford that kind of extravagance.

But, for $700 I would much rather have THIS 38cc 4C

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 4:06 AM   
91zulu



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Status: offline 		How much more is the Kolms 50 ?

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 6:03 AM   
SrTelemaster150



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ORIGINAL: 91zulu

How much more is the Kolms 50 ?



I can't find any prices, youhave to "call for best prices".

ow's that old saying go?

If you have to ask, you can't afford it!

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 6:10 AM   
91zulu



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Status: offline 		Should be under $1000, for the 50

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 6:30 AM   
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Status: offline 		On AMR-RC's site, the 50 is $1525 & the 65 is $1795. I know that place is in Canada and Vogelsang may be less, but it does give you an estimate of price. The Kolm sure do look lovely though.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 7:12 AM   
91zulu



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Status: offline 		Holy cow foot....Well guess the same folks that buy the Mokis will buy the Kolms.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 3:01 PM   
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Status: online 		I'd like to find some dimensional drawings for the Kolm 65 but..

The Saito 325R is more expensive than the Kolm 65 and with way less power. Of course its a more compact engine too and its a radial etc.

The Kolm 65 is recommended for planes up to about #30. I find that part a bit odd. I suppose the author is conservative in his recommendation as a G62 has about the same or less power and works fine in heavier planes.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 3:17 PM   
SrTelemaster150



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ORIGINAL: panhndl

On AMR-RC's site, the 50 is $1525 & the 65 is $1795. I know that place is in Canada and Vogelsang may be less, but it does give you an estimate of price. The Kolm sure do look lovely though.

I think that's a bit steep for a single cylinder 4-stroke.

For less than the Kolm 65 you can buy an 5.8 HP 4C 85cc BOXER TWIN from Roto Motor.



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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 4:37 PM   
vertical grimmace



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Status: offline 		Price will certainly be an important factor. Everyone seems to be pretty happy with their new OS gas 2 strokes. One thing is for sure, gas is the wave of the future. Will be nice to see some smaller 2 stroke offerings as well.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 5:05 PM   
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Status: online 		Hello? sometimes those boxers dont fit within a cowl. etc.. where as a single cylinder will.



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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 7:12 PM   
SrTelemaster150



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Hello? sometimes those boxers dont fit within a cowl. etc.. where as a single cylinder will.





So you can validate paying $1700 for a single cylinder engine?

It just seems a bit steep to me.

The 85cc Boxer will be less distance from prop centerline to the top of the rockrer cover than the 65cc single.

Unless the plane in question is something W/an inline like a Spitfire or Mustang the boxer will probably be easier to conceal.

Too bad Saito doesn't make a version like the 200Ti based on the FG36 cylinder. By lengthening the stroke a little like they did W/the 200Ti they could make an 80cc inline "V" twin or 160cc I-4 that would fit into a big Mustang cowl.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 7:15 PM   
SrTelemaster150



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ORIGINAL: vertical grimmace

Price will certainly be an important factor. Everyone seems to be pretty happy with their new OS gas 2 strokes. One thing is for sure, gas is the wave of the future. Will be nice to see some smaller 2 stroke offerings as well.



Some of us just can't stomach the 2-stroke sound.

Evenetually all 2-strokes will be legislated out of existance. California will be the 1st.

Look @ outboard motors, snowmobiles & now weed whackers.

My Stihl FS90 trimmer is a 4-stroke.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 8:16 PM   
earlwb


 

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Status: offline 		Well one could go with the NGH 38cc four stroke engine too. It is selling for $359.00 plus shipping at this time.
http://www.rcuniverse.com/forum/m_11298314/tm.htm http://www.himodel.com/engines/NGH_GF38_38CC_4-Stroke_Petrol_Engine.html

I would bet that the OS 40cc engine will be priced near $1,000 US when it makes it over here to the USA.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 8:32 PM   
SrTelemaster150



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Well one could go with the NGH 38cc four stroke engine too. It is selling for $359.00 plus shipping at this time.
http://www.rcuniverse.com/forum/m_11298314/tm.htm http://www.himodel.com/engines/NGH_GF38_38CC_4-Stroke_Petrol_Engine.html

I would bet that the OS 40cc engine will be priced near $1,000 US when it makes it over here to the USA.



That NGH 38cc Fs makes less power than my FA150CDI did when I tried some E-85 in it. About 2.4HP (7500 W/18x8) for the 150 burning E-85, 200 rpm less for the NGH38Fs.

As one reads some of the more recent posts from users, optimism seems to be waining.

Until more powerful resonably priced 4s engines are available I'll stick to my Saito CDI/methanol engines.

2-strokes of any form are not an option for me. I'm a motorhead & fly as much to hear the more realistic 4s sound as anything.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 9:16 PM   
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Status: offline 		True, but so far I have noticed that the other four stroke gas engines in this size range aren't really developing lots of power either. The Fuji four stroke was pretty pitiful and it was quite expensive. That Roto four stroke single cylinder engine seems to be anemic too. I don't know about the Kolm engines though, they were impossible to get around here for a long time.  The big Moki engines and some others are in that same category of being hard to get too. I think the problem is that the gas four strokes aren't really setup for developing that much power so far. I think the ease of use, easy starting, etc are the design features the companies went with. The newer Saito single cylinder engines are all pretty much high performance engines though, as they run higher lift cams with more duration to them. Most of the other companies aren't running their engines that hot (except for Enya maybe).

Yeah I have a Saito 1.50, a Enya 1.55, as well as a ASP 1.80 engines I have been thinking about converting one of them over to gasoline. Especially since CH-Ignitions has a conversion kit for the Saito engine too. I think mine is the high compression Saito though. so I would have to put the shim on it to lower the compression down more for gasoline use. Of course it might work fine with premium high octane gasoline like that though.

I had heard a large four stroke run before at our flying field, I forget which one, but it sort of sounded more like a lawn mower engine though. So it is a tough call on whether it might be less annoying or not to the neighbors. But then the neighbors might think your running your lawnmower when you are test running the engine at home and not complain about it.




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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 9:37 PM   
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True, but so far I have noticed that the other four stroke gas engines in this size range aren't really developing lots of power either. The Fuji four stroke was pretty pitiful and it was quite expensive. That Roto four stroke single cylinder engine seems to be anemic too. I don't know about the Kolm engines though, they were impossible to get around here for a long time.  The big Moki engines and some others are in that same category of being hard to get too. I think the problem is that the gas four strokes aren't really setup for developing that much power so far. I think the ease of use, easy starting, etc are the design features the companies went with. The newer Saito single cylinder engines are all pretty much high performance engines though, as they run higher lift cams with more duration to them. Most of the other companies aren't running their engines that hot (except for Enya maybe).

Yeah I have a Saito 1.50, a Enya 1.55, as well as a ASP 1.80 engines I have been thinking about converting one of them over to gasoline. Especially since CH-Ignitions has a conversion kit for the Saito engine too. I think mine is the high compression Saito though. so I would have to put the shim on it to lower the compression down more for gasoline use. Of course it might work fine with premium high octane gasoline like that though.

I had heard a large four stroke run before at our flying field, I forget which one, but it sort of sounded more like a lawn mower engine though. So it is a tough call on whether it might be less annoying or not to the neighbors. But then the neighbors might think your running your lawnmower when you are test running the engine at home and not complain about it.





Yes the Roto Motor Fs35 is claiming 3.5Hp W/a 20x10 @ 6000 RPM, but that only computes to about 2.5 HP too.

If you can get E-85 where you are, it will work @ higher CR than premeium unleaded.

Guys are running 14.5:1 in the new Gen III Chrysler Hemis W-85.

I would try converting that HC 150 & run some E-85 through it before you use the shims.

E-85 is cheaper than gas anyway & much cleaner burning.

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RE: O.S. 4 stroke gasser 40cc - 1/23/2013 10:23 PM   
MTK



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Yes the Roto Motor Fs35 is claiming 3.5Hp W/a 20x10 @ 6000 RPM, but that only computes to about 2.5 HP too.


Did I read that right? 60 ounces for a 35cc 4 stroke? An awful lot of nose weight it seems to me.


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RE: O.S. 4 stroke gasser 40cc - 1/24/2013 12:38 AM   
91zulu



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ORIGINAL: earlwb

True, but so far I have noticed that the other four stroke gas engines in this size range aren't really developing lots of power either. The Fuji four stroke was pretty pitiful and it was quite expensive. That Roto four stroke single cylinder engine seems to be anemic too. I don't know about the Kolm engines though, they were impossible to get around here for a long time.  The big Moki engines and some others are in that same category of being hard to get too. I think the problem is that the gas four strokes aren't really setup for developing that much power so far. I think the ease of use, easy starting, etc are the design features the companies went with. The newer Saito single cylinder engines are all pretty much high performance engines though, as they run higher lift cams with more duration to them. Most of the other companies aren't running their engines that hot (except for Enya maybe).

Yeah I have a Saito 1.50, a Enya 1.55, as well as a ASP 1.80 engines I have been thinking about converting one of them over to gasoline. Especially since CH-Ignitions has a conversion kit for the Saito engine too. I think mine is the high compression Saito though. so I would have to put the shim on it to lower the compression down more for gasoline use. Of course it might work fine with premium high octane gasoline like that though.

I had heard a large four stroke run before at our flying field, I forget which one, but it sort of sounded more like a lawn mower engine though. So it is a tough call on whether it might be less annoying or not to the neighbors. But then the neighbors might think your running your lawnmower when you are test running the engine at home and not complain about it.






True you are right that most of the 4s power wise is lacking. I wonder why Thunder Tiger do not come out with a bigger 4s. Their 91 has lots of power, more than the OS 91 with out the air box. That is one engine that is under rated, guess because people could not get it to idle. I did. The trick was give it time to properly break in on the bench. It certainly was not an OS where you could stick it in a plane out the box. I think TT would make some excellent mid size gas engines, both 2s and 4s.
Its funny how many is on the Saito band wagon, when Saito was almost history in the mid to late 90s. I think it was the 100 that came out right after the YS and OS with air chambers that brought Saito back to life. It was always a super reliable engine , but had zero power. How ever the pattern boys did a good job to promote back into play the Saito line. The 100 packed a punch and so did the 150.
Enya is another excellent engine, they too could be doing well in the mid size gas line. All these good companies letting OS get away with murder. TT and Enya could put a serious hurting on OS if they would only get in the game.

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RE: O.S. 4 stroke gasser 40cc - 1/24/2013 2:33 AM   
blacorebea


 

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RE: O.S. 4 stroke gasser 40cc - 1/24/2013 3:11 AM   
airraptor


 

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ORIGINAL: MTK


quote:

ORIGINAL: SrTelemaster150


Yes the Roto Motor Fs35 is claiming 3.5Hp W/a 20x10 @ 6000 RPM, but that only computes to about 2.5 HP too.


Did I read that right? 60 ounces for a 35cc 4 stroke? An awful lot of nose weight it seems to me.

In a scale planes these Four strokes are just fine. The 20x10 at 6,000 may seem weak but plenty for scale flying. I almost went with two of the Roto Motor 35 FS for my tiger cat. I skimped out though and dwent with the Sierra gear with brakes. hat cut my engine fund down some lol. So DLE 35's are on their way now.

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