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HIROBO Turbulence - SDX - Freya - Sceadu > Advantages of using the 95 or 93T gear on a Freya powered by OS 61
 
 
tittelba
Senior Heliman
Location: Bolingbrook, IL

My Posts This: Topic  Forum		My Freya (bought used) is set-up with the white 93T gear. It's powered by a OS 61 engine. What are the advantages and disadvantages of using this 93T gear over the 95T....and visa versa? Using the 93T gear I know the RPM will be higher for a given engine RPM. Can the OS 61 handle the extra power required by using the 93T gear? Is this correct?

Thanks,
Tom

www.baltimoreboyz.us
03-24-2002 Over year old.
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Dave_D
Key Veteran
Location: Philippines

My Posts This: Topic  Forum		I'm running this setup now and its doing a-ok.

So far the hardest things I have attempted personally is multiple rolls and sustained inverted flight. The better guys who flew it did rolling circuits without causing the engine to sag so I guess it's fine. However, I do use 660mm blades since I know I will put undue load if I use 680mm blades and I am not doing any harsh 3D.
03-24-2002 Over year old.
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traderdave2
Veteran
Location: Covington, GA

My Posts This: Topic  Forum		Tom,
The 93 tooth should be fine. A lot of people with the YS go to the 93 to make the engine a bit happier. The os will also do fine on the 93. There are helis running an os with lower gear ratios than 9.3:1 with no problems. I believe my x-cell graphite, I had a few years ago, had a 9:1 ratio with the os 61.

The 93 tooth will mean slightly less noise than a 95 tooth. The 680s should also be fine. The autos will be improved with the larger blades.

Harlan
03-25-2002 Over year old.
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z11355
rrMaster
Location: 10000 is enough time wasted.

My Posts This: Topic  Forum		the machine auto's forever on 680's.

Due to the head design, 680's are equiv to
something like 700-710's on most other
machines.
03-25-2002 Over year old.
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vetrider
Elite Veteran
Location: Daleville, AL (Ft.Rucker)

My Posts This: Topic  Forum		Are you fellas just changing the main gear or the Pinion gear also?

Thanks

Nolan
KBDD, Magnum Fuel
Stratus, 700E, K3D, Vibe, Protos.
03-25-2002 Over year old.
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Dave_D
Key Veteran
Location: Philippines

My Posts This: Topic  Forum		Just the gear. I measured the diameter of the 93T vs. 95T stock gear and it's the same, only the number of teeth are different. FYI a stock R60 also uses 9.3:1 gear ratio.

When I pop in a YS80, all I need is to swap the pinion (or clutch bell w/ 11T pinion).
03-26-2002 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > Advantages of using the 95 or 93T gear on a Freya powered by OS 61
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