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09-05-2006 02:21 AM  14 years ago
Buzzin Brian

rrProfessor

College Station, Texas

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If you go 8:4 you do not have to modify the frames. It will work just fine without all of that. Its a simple pinion change to get it there on a bone stock Vigor CS. And the model will fly just fine. I actually preffer that ratio with the YS 91. That one or 8:36 work great. The 8:0 ratio was intended for the OS 91 with a MP2 when everyone started useing it. And usually YS likes a little higher ratio I have found. All who disagree thats fine. I know what works for me. And I run SEVERAL YS engines. And not one is on 8:0. Do what you want. But I would just change the pinion. Do a search for YS 91 in Vibe and you will see what everyone is suggesting to change the ratio to. The Vibe and the Vigor CS are close brothers. So the same would apply. Enjoy!Build it, fly it, crash it. Repeat as often as needed.
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09-05-2006 03:44 AM  14 years ago
JRMAN

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Macedon, New York

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If you are looking for a higher head speed for 3D then the 8.0 ratio is what you'll need. 8.4 is on the low side and would over rev your engine when trying to get a head speed of more than 1800. I'm sure the 8.4 seemingly works for some people but you can't ignore the numbers. 15000 Engine RPM / 8.4 Gear Ratio = 1785 Head Speed.


This is from YS's web site.

RPM Range: 2,500 to 15,000 RPM

Extensive testing by YS factory team pilots has shown the engine to be the smoothest and most powerful heli engine available today. Ideal gear ratios for 3D flying are 8 to 1 and F3C flying are about 7.5 to 1.


If you just buy the Vibe engine mount you wont have to mill anything
To run 11t pinion and the 88t main fro the 8.0 ratio.


The less time I have the more I get done.
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09-05-2006 05:00 AM  14 years ago
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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i just got an 11 tooth pinion, i was planning on keeping my 84 tooth main gear for a ratio of 7.6:1
i realize that would give lots of head speed, but would it suffer noticably in higher loading 3D ? does nayone heere run that ratio with the YS91?
Shawn
Team Leisure-Tech
Team HelixRC
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09-05-2006 06:15 PM  14 years ago
UK Helinut

rrApprentice

Gloucestershire

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Everyone quotes numbers for power and RPM, JK and a few other pilots recomended 8.45:1 with a Y.S and used it.

Numbers really mean nothing but a ball park figure, the results are seen in the air.

Pinkbike You will be fine with the pinion only change.
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09-05-2006 08:29 PM  14 years ago
DS 8717

rrProfessor

Here wishing i was somewhere else

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At the time JK and todd were using the YS they were also only runnung 1750 headspeed. Now that everybody is using higher headspeeds the ratio would have to be in the 8.0 to 8.1 range to keep the engine in the power band. 1900 x8.18 = 15500 engine RPM.1900 x 8.4=15960 engine RPM. 1950 headsppeed equals even more RPM.DOUGYOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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09-05-2006 09:49 PM  14 years ago
UK Helinut

rrApprentice

Gloucestershire

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Pinkbike will only be using sub 1750 head speeds anyway.
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09-08-2006 03:16 PM  14 years ago
Pinkbike

rrApprentice

UK

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Guy's thanks for the information. 'UK Hekinut' has responded in my absence i have been overseas on business.
I think I will just opt for the pinion change, but an interesting point from JRMAN, to purchase the vibe engine mount? As easy as that then?
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09-08-2006 03:37 PM  14 years ago
JRMAN

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Macedon, New York

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Pinkbike, If you purchase the Vibe engine mount you will still need to
slot a couple of baring block holes. This is vary easy and it can be done with a file in a few minutes.


The less time I have the more I get done.
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09-08-2006 04:46 PM  14 years ago
Pinkbike

rrApprentice

UK

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Thanks JRMAN.
A cheeky question, do you have the part number for the Vibe engine mount?
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09-08-2006 05:09 PM  14 years ago
JRMAN

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Macedon, New York

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JRP996075

The less time I have the more I get done.
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09-08-2006 05:10 PM  14 years ago
JRMAN

rrVeteran

Macedon, New York

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Vibe engine mount

http://www.horizonhobby.com/Search/...RP996075&CatId=


The less time I have the more I get done.
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09-08-2006 05:13 PM  14 years ago
Pinkbike

rrApprentice

UK

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Thanks alot JRMAN
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09-12-2006 07:09 PM  14 years ago
Pinkbike

rrApprentice

UK

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Buzzin Brian,

I have finally decided to go with your advice. I have ordered the 10T pinion and am waiting for the postman to arrive. Thanks again for everybodies input. I will post my take on this when this little project is finally flying.

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