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HIROBO Turbulence - SDX - Freya - Sceadu > Os91
 
 
Kurt64
Veteran
Location: Salladasburg, PA

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I have decided to put an OS91 in my Freya. I know I have to use the 12 tooth pinion gear, but what should the main gear be....93 or 95 for 3D?
10-24-2001 Over year old.
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Ken B
Elite Veteran
Location: Phoenix, AZ

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Neg

11 tooth pinon with the 95 tooth delrina is said to be the "best" 8.63 to 1 ratio. Then an 11 tooth with a 93 8.4 to 1 ratio. The 11 tooth gears will be out in a month or so. I say fly your Freya as is, start stock piling parts then when the 11 tooth comes out Bingo swap it all.

Make sure you swap out the standard plastic gear with the Delrina, I have heard about 3 freya plastic main gears getting stripped with the OS 91.

Also I reading about others I have heard that you might want to do the "uniflow" fuel piping AND/OR run a header with the OS 91.

For what it's worth I plan on doing all of the above.

OR you can do the Bergen 11 tooth but I don't like all the machining that needs to go into it.

Ken B
10-24-2001 Over year old.
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Hirobonut
Heliman
Location: Arcadia, CA

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I use a 93T main gear with no problems

I have a regular Freya that I have installed an OS 91 with Hatori muffler. I used the 12T pinion and the 93T main gear and fly with 15% fuel and so far I haven't had any problems. Climb outs are amazing with this engine. I have 11 degrees of pitch and no bogging. Additionally you can do flips all day long if you wish to. The engine and the combination that I used will handle it so far. (So Far being about 1 gallon through the engine).



10-24-2001 Over year old.
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HIROBO Turbulence - SDX - Freya - Sceadu > Os91
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