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E-flite . Fast Lad Performance . Ace Hobby

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Synergy R/C Synergy N9 > New gear ratios for the YS91SR- Latest update - 8:1 gear ratio
 
 
Torkroll
Senior Heliman
Location: Bakersfield Ca

My Posts This: Topic  Forum

Where do you fly?
I am in Bakersfield, I might come and fly there.

Anyone who says it's a small world never tried to walk to Zimbabwe.
Jerry
01-24-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Ok guys, here is the update.

I just rebuilt my engine because I burned it 2 weeks ago. I broke it in yesterday and today I got a chance to test the new pinion more. Guys, it was so ballistic that it scared me when I fist flipped the idle switch. I was running 1920 and 1950 rpm. I noticed that at both headspeeds the engine seems to have no bog at all. It just pulls and pulls and pulls whatever moves I give it. However, I liked the 1920 more because the heli is tame and easy to control. Since I put the new pinion in, I have crashed 2 times and the pinion still holds up.

Bottom line, the new gear ration 7.75 really makes it different. You can run 1950 headspeed without worrying about the engine bearings. The YS91SR really makes more power with the new ratio.

The videos of it will be posted soon.

Here is my setup

- YS91 SR
- Hatori SB19
- 3 x 9451's
- Jockey Governor + s9650
- JR7703D + 8900
- Arizona regulator + evolite 2500 2s
- Radix 710 Stick Bangers

All are running on 6v except for the tail running on 5.1v

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
02-03-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		here is a video of my buddy flying my synergy. He was trying to load the engine up but it was hard

Right Click --> Save As

Jason Chow Synergy N9 7.75 Gear Ratio

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
02-03-2008 Over year old.
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thenewguy
Key Veteran
Location: Corvallis, Oregon Where there is liquid sunshine!

My Posts This: Topic  Forum		Holly cow, That was cool!
02-03-2008 Over year old.
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MR SLOWFLOW
Veteran
Location: N.J/N.Y

My Posts This: Topic  Forum		LOOKS GOOD

aka MR AIRBRUSH
02-03-2008 Over year old.
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Chuckie
Key Veteran
Location: Crofton Maryland, MHA member

My Posts This: Topic  Forum		Very good flight. The pinion makes the N9 sound a little different so I guess I'm hearing the rotor more even. I do hear a higher pitch sound so I'm not sure what that is coming from. What are the needle settings? The motor sounds lean in the midrange! It would be nice to see/hear how the heli flys through a big high load maneuver.

Charles

Please stand by for faster service!
02-05-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Yes Chuckie, it was lean in midrange. I already gave it 1 click out after that.

Pitch setting: 13 for pitch, 7.5 for cyclic.

I also converter the 5mm flybar to 4 mm flybar and it was faster noticeably.

I'm making some more and hope I will have them in the end of this month.

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
02-05-2008 Over year old.
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Kinger
Elite Veteran
Location: Columbus, OH

My Posts This: Topic  Forum		I'm with Chuckie, I'd like to see that machine flown in big stuff and without the constant load on the rotor head to hear what the engine sounds like.
02-05-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Maybe my video will help. I flew much slower than he did in this video

http://www.rchelisg.com/videos/syne...ratio_02_02.wmv

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
02-05-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Although the new 16t pinion provides more power on a YS91SR engine I still see that 7.75 gear ratio is too low and I want to increase that ratio a little bit. So a new manigear with higher tooth number needs to be made. Here is my calculation based on 1950 headspeed:

124T / 16T --> 7.75 ratio --> 15112 engine rpm --> has been proven having better power

125T / 16T --> 7.8125 ratio --> 15234 engine rpm

126T / 16T --> 7.875 ratio --> 15356 engine rpm --> This is what I want to try right now.

127T / 16T --> 7.9375 ratio --> 15478 engine rpm --> This is what I want to try right now.

Ok guys, stay tuned!

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
02-05-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Here is the latest update of this project

I just got some 128T maingears and 16T pinions in and the 8.0:1 gear ratio is made up. At this ratio the engine will revolve at 15600 rpm to achieve 1950 headspeed.

I have put 2 gallons through this new setup and the result is really successful. I got more torque during hard moves and I got the pop of 1950 headspeed. The engine runs cool and doesn't seem to be loaded up. Here is a video of me flying it:

right click --> save as

http://www.socahc.com/upload/long_s....0gearratio.wmv



One bad thing about these new maingears is that the heli becomes a little bit noisy because of not perfect material choice.

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
03-31-2008 Over year old.
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creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

My Posts This: Topic  Forum		That looks a lot more promising than the 7.75 ratio. What material did you use for the main?
03-31-2008 Over year old.
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creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

My Posts This: Topic  Forum		Tried the 8:1 gear ratio this afternoon (thanks Long for the gear and pinion) and I have say that I like it. I was running 1940 on the head and didn't have any problems with the engine bogging. Long, you were right about the gear being noisy. When I watched your video I thought your engine sounded a little lean; after flying with the gear this afternoon, however, I now realize the noise is the drivetrain. I had to run 3.5mm of shims on the engine mounts to get a decent gear mesh. It was a little loose but 3.0mm was just a little too tight. I put six tanks through it today and I'm hoping that the gear wore in just enough that I can remove .5mm on each side now and get a proper mesh. I think that ought to quiet it down some if it works. I have video from one of the flight that I will post later after it finishes encoding. Thanks again.
04-06-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Thank you very much for your feed back.

Yes, the material is so hard that it's a little bit noisy. I'm still finding other more suitable materials. My shim setup is: 2 x 1.5mm shims + 1 x 1.0mm shim = 4mm on each side. I tried 3.5mm before but I think it worked but was a little bit too tight. Don't know why your shim setup is different from me.

I'm waiting for my new video and it should be up soon. And I'm also looking forward to seeing creightoncarr's video

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
04-06-2008 Over year old.
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creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

My Posts This: Topic  Forum		I don't know why I was able to get by using less shims than you. I tried 4mm but the mesh was way to loose. With 3.5mm it was smooth but noisy. With 3mm the mesh was not smooth at all. I was a little worried that the main gear would get chewed up since the mesh with the pinion was a little loose but it seems the have held up well today. The video should be ready in about two hours or so. It's been uploaded to Vimeo but it awaiting their conversion process.
04-06-2008 Over year old.
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creightoncarr
Key Veteran
Location: Missouri City, Texas - USA

My Posts This: Topic  Forum		Video from yesterday with 8:1 gearing can be found here:

http://www.runryder.com/helicopter/t422670p1/
04-07-2008 Over year old.
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Long Nguyen
Veteran
Location: Ho Chi Minh City, Vietnam

My Posts This: Topic  Forum		Here is my latest testing video:

http://www.socahc.com/upload/longng...1_gearratio.wmv

Note: Although my engine was not in perfect condition (was damaged last month due to bad fuel) and was not tuned properly (I'm not good at tuning engines) the engine still got power with this gear ratio.

Long Nguyen
My videos: http://vimeo.com/longnguyen/videos
Máy bay cắt cỏ!
04-10-2008 Over year old.
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auto illusions
Heliman
Location: Moon twp. PA USA

My Posts This: Topic  Forum		Can we buy these gears. I would really like to change my ratio. I thought synergy was going to come out with a gear but never did to my knowledge.
06-01-2008 Over year old.
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SynergyRC
Heliman
Location: California

My Posts This: Topic  Forum		Update posted on the Synergy site 5/29

http://www.synergyrc.com/en/

Team Synergy
06-01-2008 Over year old.
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Esprit Model . Thunder Power RC . Mikado Modellhubschrauber

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Synergy R/C Synergy N9 > New gear ratios for the YS91SR- Latest update - 8:1 gear ratio
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