YS 110 RPM
05-26-2007, 09:24 AM
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YS 110 RPM
What kind of peak RPM's should I expect to see when my YS 110 is turning an APC 15X8? I'm at 300 feet, type F plug, and Powermaster 20/20 fuel, and 85 degrees outside. I think I'm being a little too cautious when I tune it to 9300 rpm for flying (it's backed off from 9600); should I be able to peak it higher than 9600? I start worrying about detonation as I'm cranking the needle down.
Thanks in advance. [sm=thumbs_up.gif]
Thanks in advance. [sm=thumbs_up.gif]
05-26-2007, 09:58 AM
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RE: YS 110 RPM
Sounds low to me. I have a well used OS 120 ( non pump ) and I turn an APC 15 - 8 @ 9200 after I back it down 300. This is on 20 / 20 fuel. I had considered swapping it for a YS 110 because I thought they were a lot stronger than my OS. Maybe I'll just save my money.
05-26-2007, 10:38 AM
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RE: YS 110 RPM
Pumped engines don't require being set rich because they won't lean out during the flight unless stated otherwise in the directions peak them out and go fly.
05-26-2007, 03:45 PM
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RE: YS 110 RPM
I've found that the YS engines really don't like to run sloppy rich. I find the peak then back off until it is just threatening to drop off RPM and go fly.
I have two 110's that I purchased at the same time for my VQ P-61. After they were broken in one of them would turn a 15x8 APC over 10,000 RPM on 30%. The other peaked around 9,800 RPM.
I haven't run a 15x8 on either of them for a long time now, but there is still about a 300 RPM difference between the two on the same prop. I don't worry about it, they both run great!
Walt
I have two 110's that I purchased at the same time for my VQ P-61. After they were broken in one of them would turn a 15x8 APC over 10,000 RPM on 30%. The other peaked around 9,800 RPM.
I haven't run a 15x8 on either of them for a long time now, but there is still about a 300 RPM difference between the two on the same prop. I don't worry about it, they both run great!
Walt
05-26-2007, 08:30 PM
#9
RE: YS 110 RPM
I personally would not do as suggested by P-40 Driver.
Whether the engine is pumped or not it will unload once airborne and gain RPM.
If you have leaned it to peak and not backed off a little you could go lean as the RPM picks up from the engine unloading as the plane picks up airspeed.
Whether the engine is pumped or not it will unload once airborne and gain RPM.
If you have leaned it to peak and not backed off a little you could go lean as the RPM picks up from the engine unloading as the plane picks up airspeed.
05-27-2007, 06:45 AM
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RE: YS 110 RPM
I think P-40 Driver is probably right, the fancy fuel-injection supercharging design seems to compensate for unloading, and there is absolutely no concern about leaning out toward the end of the run since the tank is pressurized. (But that doesn't mean you want to set the engine lean.)
Unlike conventional engines I do not back off more than 100 RPM from peak on any of my YS's. In fact my 91AC doesn't really run properly unless it is set right at peak RPM. And all of my engines have performed flawlessly for several years now.
Walt
Unlike conventional engines I do not back off more than 100 RPM from peak on any of my YS's. In fact my 91AC doesn't really run properly unless it is set right at peak RPM. And all of my engines have performed flawlessly for several years now.
Walt
05-27-2007, 09:24 AM
#11
RE: YS 110 RPM
May I suggest you read the YS engine support forum as well as the instructions that come with a YS 110 ?
If you do so I'm sure you will find that both the instructions as well as the folks in the YS support forum will advise richening the mixture a bit from peak RPM.
ALL engines unload once they are allowed to pull the plane through the air. This unloading will let the engine generate MORE RPM.
More RPM means the engine needs MORE fuel. Pumped, unpumped, supercharged or normally aspirated, you can't get past that simple fact.
It would be a shame if someone toasted a $350 engine out there going off what some folks "think".
If you do so I'm sure you will find that both the instructions as well as the folks in the YS support forum will advise richening the mixture a bit from peak RPM.
ALL engines unload once they are allowed to pull the plane through the air. This unloading will let the engine generate MORE RPM.
More RPM means the engine needs MORE fuel. Pumped, unpumped, supercharged or normally aspirated, you can't get past that simple fact.
It would be a shame if someone toasted a $350 engine out there going off what some folks "think".
05-27-2007, 10:00 AM
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RE: YS 110 RPM
ORIGINAL: d_bodary
I get about 9,000 rpm with a 15x10 APC and Powermaster 20/20
I get about 9,000 rpm with a 15x10 APC and Powermaster 20/20
I get about 9000 on my 1.40FZ/16x10 x30%.
These seems to be about the number most of the guys in the pattern community got with that combo back then.
My 91FZ has alway given out just over 9000 with a 14x8 and certainly far less than 8500 with a 14x10, The later being to much prop for my engine.
With reference to power, my old Surpass 1.20 II ON 15% had FAR greater power than the YS.91FZ on 30%.
The surpass was indeeda great deal bigger, heavier and of course had a lousy, unuseable pump! As a serious aerobatic engine it was hopeless...
But it was certainly more powerful and made a far better, alround, sports/hobby engine and thats without dought what 100% of the YS .91/110s are being used for.
Not anywere near as powerfull as the YS 1.20FZ though ... that engine is very usable, much more power that todays 1.10 and no air chamber nonsense.
Mind you you can't get them anymoreas they were board out to become the 1.40FZ.
The 1.40 FZ has been a magnificent engine, years of service. The most reliable engine YS has ever made.
Thats what it's still available, re branded as the 1.40 Sport.
Anyway, the ol', mine revs higher than yours, match always makes humorous RC chat forum reading.
05-27-2007, 03:36 PM
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RE: YS 110 RPM
ORIGINAL: bla bla
I don't know where these heady numbers come from.
I get about 9000 on my 1.40FZ/16x10 x30%.
These seems to be about the number most of the guys in the pattern community got with that combo back then.
My 91FZ has alway given out just over 9000 with a 14x8 and certainly far less than 8500 with a 14x10, The later being to much prop for my engine.
With reference to power, my old Surpass 1.20 II ON 15% had FAR greater power than the YS.91FZ on 30%.
The surpass was indeeda great deal bigger, heavier and of course had a lousy, unuseable pump! As a serious aerobatic engine it was hopeless...
But it was certainly more powerful and made a far better, alround, sports/hobby engine and thats without dought what 100% of the YS .91/110s are being used for.
Not anywere near as powerfull as the YS 1.20FZ though ... that engine is very usable, much more power that todays 1.10 and no air chamber nonsense.
Mind you you can't get them anymoreas they were board out to become the 1.40FZ.
The 1.40 FZ has been a magnificent engine, years of service. The most reliable engine YS has ever made.
Thats what it's still available, re branded as the 1.40 Sport.
Anyway, the ol', mine revs higher than yours, match always makes humorous RC chat forum reading.
ORIGINAL: d_bodary
I get about 9,000 rpm with a 15x10 APC and Powermaster 20/20
I get about 9,000 rpm with a 15x10 APC and Powermaster 20/20
I get about 9000 on my 1.40FZ/16x10 x30%.
These seems to be about the number most of the guys in the pattern community got with that combo back then.
My 91FZ has alway given out just over 9000 with a 14x8 and certainly far less than 8500 with a 14x10, The later being to much prop for my engine.
With reference to power, my old Surpass 1.20 II ON 15% had FAR greater power than the YS.91FZ on 30%.
The surpass was indeeda great deal bigger, heavier and of course had a lousy, unuseable pump! As a serious aerobatic engine it was hopeless...
But it was certainly more powerful and made a far better, alround, sports/hobby engine and thats without dought what 100% of the YS .91/110s are being used for.
Not anywere near as powerfull as the YS 1.20FZ though ... that engine is very usable, much more power that todays 1.10 and no air chamber nonsense.
Mind you you can't get them anymoreas they were board out to become the 1.40FZ.
The 1.40 FZ has been a magnificent engine, years of service. The most reliable engine YS has ever made.
Thats what it's still available, re branded as the 1.40 Sport.
Anyway, the ol', mine revs higher than yours, match always makes humorous RC chat forum reading.
