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HelicopterThunder TigerRAPTOR 90 › Is the R90's tail ratio really 4.65?
09-15-2007 03:11 AM  10 years agoPost 1
RCHelicopterGuy

rrVeteran

Michigan

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My 90SE's manual says that the tail drive ratio is 4.65, but I have an 83-tooth spur and a 20-tooth pinion, which is only 4.15 (I counted each gear three times, just to make sure). How does TT come up with their number?

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09-15-2007 05:26 AM  10 years agoPost 2
jsenicka

rrProfessor

Eagle River, WI

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did you factor in the two bevel gears to the tail?

Jim Senicka
Team Manager, GrandRC Flight Team

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09-15-2007 02:17 PM  10 years agoPost 3
RCHelicopterGuy

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Michigan

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Unless I'm counting wrong, the two bevel gears on the front end of the TT are 1:1 to each other, and so are the bevel gears in the tail gearbox. If that's true, then there's no reduction or multiplication anywhere aft of the tail transmission.

Now you've done it. I'm gonna have to go count them again to make sure I didn't miss anything.

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09-15-2007 10:18 PM  10 years agoPost 4
S Bell

rrApprentice

Nova Scotia Canada

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Hi Shawn,

The intermediate gearbox bevel gears are different sizes (the one with the internal splines and the one that drives it)They are close but not the same.

Stephen

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09-15-2007 10:57 PM  10 years agoPost 5
RCHelicopterGuy

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Michigan

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Well, don't I feel stupid.

You're right. I had to go check it again, but sure enough, it's 27/24. I counted the gears three times before, and still thought they were 1:1. I need new glasses. Or maybe a math refresher.

And now, as my punishment, I'll go write "I'll check my facts before posting stupid questions" 100 times on the blackboard.

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HelicopterThunder TigerRAPTOR 90 › Is the R90's tail ratio really 4.65?
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