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HomeAircraftHelicopterThunder TigerRAPTOR 90 › PINION GEAR 10 or 12T (OPT)
03-05-2008 05:52 PM  10 years agoPost 1
rcfreak

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Norway

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Hi.
i Just upgraded my r60 to 90..
Can i use a PINION GEAR 10T (OPT) insted of 12 ?
I cant get the 12 to fit right..
I run a Os 91 sxh c-spech..

Tore

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03-05-2008 06:13 PM  10 years agoPost 2
jsenicka

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Eagle River, WI

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that would cause some major gear ratio issues.
What ratio do you want?

Jim Senicka
Team Manager, GrandRC Flight Team

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03-05-2008 06:21 PM  10 years agoPost 3
rcfreak

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Norway

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to be honest im not so good with set up on the heli,i have a friend who help me...
But when i go up on the pinion gear,shouldnt i go down on the maingear to make it fit right?
Now its like impossible to turn it...

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03-05-2008 06:45 PM  10 years agoPost 4
jsenicka

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Eagle River, WI

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no. You have slots in the frame to adjust the pinion to take care of gear lash.
The OS needs to run at 8.27 for 3D work in a Raptor. That is an 11/93 combo.

I would download the manual.

Jim Senicka
Team Manager, GrandRC Flight Team

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03-05-2008 06:56 PM  10 years agoPost 5
rcfreak

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Norway

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Thanx m8,Ill give it another try

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03-05-2008 07:12 PM  10 years agoPost 6
rcfreak

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Norway

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can u show/tell me exactly where i adjust it ?
I cant relly see it,been looking on the manual ...

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03-05-2008 07:18 PM  10 years agoPost 7
gftazz

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upstate N.Y. in the Adirondacks

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Yes you want to change out the main gear too!!
The R60 comes with the grey 93 tooth main gear and in the R90 you want to use the WHITE 91 TOOTH MAIN GEAR that is why your having such trouble trying to get the 12 tooth pinion to fit.
You use the WHITE GEAR with 11 tooth pinion to get a 8.27 ratio for 3D flying and the 12 tooth with WHITE GEAR to get I think it was a 7.79 ratio which is better for FAI flying.
If you use the GREY MAIN GEAR 93 teeth and the 11 tooth pinion you get 8.45 ratio and that was what people were using for the YS91 motor but the newer YS91 redhead longstroke likes the 8.27 ratio better so the most common one is to go with the WHITE 91 tooth main gear and the 11 tooth pinion for a 8.27 for YS and OS motors out now for 3D flying.
The GREY main gear and 12 tooth pinion is too big in their combined diameters and so the slots in the frame can't give enough movement for them to work together that is why the you use the WHITE gear.

Tom

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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03-05-2008 07:44 PM  10 years agoPost 8
rcfreak

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Norway

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Thanx,
that was a awsome answer to my problem...
Ordering new parts now..
Thanx

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03-05-2008 07:56 PM  10 years agoPost 9
gftazz

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upstate N.Y. in the Adirondacks

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Your quite welcome friend.
No problem that is what we are all here for.

Tom

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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03-06-2008 01:16 AM  10 years agoPost 10
payne1967

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uk

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the grey gear 93t is std in the 90 kit and does fit with the 12t pinion
my 60-90 conversion was running the 91/12 gears but the motor was over heating due to the load I've gone to the 93/12 gears as per the 90 thats in my md500 with no problems with gear mesh
if you try the 93/11 with a 60 motor the engine also over heats due to the load on the engine and the motor runs out of its power band

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03-06-2008 03:16 PM  10 years agoPost 11
jsenicka

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Eagle River, WI

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oops.
Sorry, I should have said 11/91.

Jim Senicka
Team Manager, GrandRC Flight Team

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03-06-2008 03:22 PM  10 years agoPost 12
rcfreak

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Norway

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But thanx all for posting..
I have ordered the parts now,come back with update how it went

Tore

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HomeAircraftHelicopterThunder TigerRAPTOR 90 › PINION GEAR 10 or 12T (OPT)
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