YS 91/110 vs. OS 91 SX Acro Sport  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> YS 91/110 vs. OS 91 SX Acro Sport
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YS 91/110 vs. OS 91 SX Acro Sport - 3/6/2003 2:16:59 AM   
Stephan


 

Posts: 8
Joined: 3/28/2002
From: Germany - Bavaria
Status: offline 		Hi,

for my new plane (Synergy 90) I´m searching a powerfull engine.
In Germany Yamada engines aren´t as popular as OS engines.

I want to compare thes engines, but I can´t find someone who could tell me the rpm of a YS 91/110 with a 15x8 APC.

What would you prefer??? I think the new OS is also quiet good (9400 rpm with APC 15x8W)......

Perhapes you could help me.........

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Cu´Stephan
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YS 91/110 vs. OS 91 SX Acro Sport - 3/6/2003 9:28:48 AM   
PatternFlyer



Posts: 792
Joined: 5/11/2002
From: Pittsburg, KS, USA
Status: offline 		I don't know if there is a 91SX Aero sport in US, can not find one.
I am getting a 91SX-H and will be running it next week. I bought this 91SX-H because it was about $140 cheaper than YS110 or YS91ST.

If the 91SX turns 15x8W @ 9400 rpm. I think it is good. What's the nitro %?

Does 91SX Aero have K series 3 needle carb, standard 2 needle, or remote needle?
What is the part number for the muffler?
Is that rpm with a tuned pipe or just standard muffler?

YS 91AC/FZ maybe a little bit better or similar to that. I only ran 14x10APC around 9500 ~ 9700 rpm.

I saw a posting at 3D flying forum that YS 110 turning 15x6 at 10500 rich setting. 16x6 @ 9550 rich. 30% nitro

Maybe I have to try 15x8 on my 91AC, but will compare the 14x10 first since I already have the props.
I will post the rpm as soon as I run next week.

If the price and availability are not the constraints, I would go with YS 4-stroke because I can put the fuel tank on CG, standard muffler work great. I don't have to use tuned pipe on 4-stroke.

I heard high nitro % fuels are not easy to get in Europe.
You may also consider YS91ST which I was planning to get before the purchase of 91SX-H.


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YS 91/110 vs. OS 91 SX Acro Sport - 3/6/2003 2:53:45 PM   
ShempHoward


 

Posts: 1147
Joined: 12/4/2001
From: San Francisco, CA, USA
Status: offline 		Funny - OS does ot list the 91SX Acro on their Japan based Web Page and it's not available here either. Can you send a picture of it or a link to where info can be found? I wonder if its just the 91FX renamed or perhaps the airplane version of the 91SX-H?

(in reply to Stephan)
       Post #: 3

YS 91/110 vs. OS 91 SX Acro Sport - 3/6/2003 4:14:08 PM   
Stephan


 

Posts: 8
Joined: 3/28/2002
From: Germany - Bavaria
Status: offline 		@patternflyer:
The setup of the OS : fuel: 5% nitro, 15%oil, Greve-Pipe.

It´s got a remote needle, if I understand your question right. ( you can change the setup of the needle with a servo during the flight....)

I think the OS has a few advantages compared to YS:
-it weighs less than the YS (so I need little less power )
-runs fine with only 5% nitro (nitro is very expensive in Europe)
-is cheaper
-the availability of spare parts is better

So, if the YS engines aren`t so much stronger I ´ll take the OS!
I think they´ll also work fine with a 3.1kg airplane………

@Shemp Howard:

The OS 91 SX Acro Sport is indeed the airplaine version of the 91SX-H.
But unfortunately I can´t explain the difference between the old 91 FX and the new one, because I don´t know the technical terms in english……
In the USA I think it´s called “OS 91 C”…..but i´m not sure…..

But here is a link (only in german):

http://www.graupner.de/neuheiten_download/Neuheiten_de/132N03WG.pdf

_____________________________

Cu´Stephan

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       Post #: 4

YS 91/110 vs. OS 91 SX Acro Sport - 3/6/2003 5:26:59 PM   
PatternFlyer



Posts: 792
Joined: 5/11/2002
From: Pittsburg, KS, USA
Status: offline 		Stephan,

Thank you for the info!!

It is actually a 91SX-H with inflight control needle valve and drive washer of 61SX/SF. Actually OS 91SX & FX has no differences based on the specifications listed in manuals (Same bore & stroke). SX-Aero is with 71705000 inflight control needle valve ($29.99 at Tower).

9400 rpm with 5% nitro is very good!! Any sign of engine loading up? OS in US told people to run 91FX at least 10500 rpm or above.

Do you know the link to the Greve tuned pipe website?
Wat is the dameter and length of the tuned pipe that you are using? Greve pipe is very light compared to Macs and some others.


The PDF link has the tuned pipe which I believe is made by Hatori.

Here in US, there is only one version of Greve tuned pipe is available for 120 ~ 140 size 2-stroke.

If the price is good, I would go with YS 91ST with tuned pipe since there isn't much difference in weight. I am going to order one of YS 91ST to compare the two.

I believe in Europe, it is better to go with OS.
http://www.osengines.com has almost all the information for the engines available in US, but still do not have 91SX-H C-Spec. Tower has specifications, but no manual available.

I wonder why the Grapuner didn't use K series 3-needle carb instead of in-flight control needle. That way people can save weight of additional servo and linkage + the headache to mix out the throttle.


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YS 91/110 vs. OS 91 SX Acro Sport - 3/7/2003 12:49:41 AM   
Stephan


 

Posts: 8
Joined: 3/28/2002
From: Germany - Bavaria
Status: offline 		What do you exactly mean with“engine loading up“?
The old one often had a thermal problem when using it under 10000rpm. This problem should be solved with the new one…..there is no tendency of overheating.
It´s also got an higher torque and a better fuel intake (I hope it´s the right expression.. : ).

@Greve pipe:
The tested engine and pipe weren´t mine. So I can´t give you any facts about the pipe at the moment….i´ll ask my friend next time I see him!
Greve has no homepage….sorry…..
I´ll use a Genesis-Pipe(Weston-UK: http://www.westonuk.co.uk/ ). The Greve pipe and Genesis pipe in this category are rather similar.

_____________________________

Cu´Stephan

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       Post #: 6

YS 91/110 vs. OS 91 SX Acro Sport - 3/7/2003 1:25:39 AM   
PatternFlyer



Posts: 792
Joined: 5/11/2002
From: Pittsburg, KS, USA
Status: offline 		Stephen,
I was referring to overheating.

What do you mean by new one and old one? SX-Aero and previous version?

I looked at the WestonUK website. They have lots of different tuned pipes, but not enough info regarding pipe such as length, diameter, weight etc.

Since they are hard to get in US, my only choice is Asano 60 size pipe, ES carbons, Macs.

I will probably try my carbon mufflers first, then get a tuned pipe.


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(in reply to Stephan)
       Post #: 7

YS 91/110 vs. OS 91 SX Acro Sport - 3/7/2003 2:09:49 PM   
Stephan


 

Posts: 8
Joined: 3/28/2002
From: Germany - Bavaria
Status: offline 		[QUOTE]What do you mean by new one and old one? SX-Aero and previous version? [/QUOTE] Yes, I meant the "old" 91 FX and the new "91 SX Acro Sport".....

I´ve ordered the new 91 SX and a Genesis Pipe. When I`ve got them I can give you more informations.
I think this is the right choice in my case.....

_____________________________

Cu´Stephan

(in reply to Stephan)
       Post #: 8

YS 91/110 vs. OS 91 SX Acro Sport - 3/7/2003 5:04:25 PM   
PatternFlyer



Posts: 792
Joined: 5/11/2002
From: Pittsburg, KS, USA
Status: offline 		Stephen,
would you tell me the part number of Genesis pipe that you ordered?
Which header pipe did you order with the tuned pipe?
I sure wish to hear how your engine runs with the pipe.
Maybe we can compare some.
thanks,


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       Post #: 9

YS 91/110 vs. OS 91 SX Acro Sport - 3/14/2003 4:08:39 PM   
robert


 

Posts: 2448
Joined: 3/2/2002
From: private, IRELAND
Status: offline 		Stephan,
I have just purchased a YS 91ST for my plane, and I was thinking about using some of the Weston UK pipes. Please tell me what you think of yours so that I can make up my mind.
Thank You!
Robert.

(in reply to Stephan)
       Post #: 10

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