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Old 09-02-2011, 10:46 AM   #1
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Default Lightest Pinion and Spur Gears?

Who manufactures the lightest pinion and spur gears?
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Old 09-02-2011, 03:25 PM   #2
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Who manufactures the lightest pinion and spur gears?
So, does nobody know or is this one of those secret sauce sort of things that no one wants everyone to know (if so, I welcome PM's)
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Old 09-02-2011, 03:28 PM   #3
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I don't know if these are the lightest but they look like they are : Litemodz Ultra Premium Pinions

Spurs...maybe the Robitronic Delrin spurs...?
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Old 09-02-2011, 04:39 PM   #4
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Ive got a kimbrough carbon fibre pinion and that weighs hardly anything il weigh it when I get a chance
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Old 09-02-2011, 05:33 PM   #5
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Who manufactures the lightest pinion and spur gears?
Why do want lightest?

Not sure motor can tell the difference really?

Of course something lighter will slow down and start faster in linear time based physics

So I think in short courses with 180's these lighter components will work more efficient regarding batteries

Power band will also play a part in lighter gearing

So many variables but I think lighter cars like 12th will only feel a difference and barely as I've never noticed and I've raced with both light and heavy gears

Just a opinion

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Old 09-02-2011, 05:54 PM   #6
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In my opinion ,the Hirosaka gears are not only the lightest but also the better designed gears out there !!!! The coefficient of friction between hirosaka pinions and spurs seems much lower than kimbrough, Robinson, etc..... I have them in my mod tc4, and I can tell you they are awesome : less motor heat ,battery mileage is perfect !!!!
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Old 09-02-2011, 06:27 PM   #7
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Why do want lightest?
... it's a somewhat fanatical desire to remove as much rotating mass from the drive train as possible. I'm not sure of the math on this one but from my understanding there's something like a 10:1 effect that rotating mass has on acceleration (as apposed to static mass). Taking away a single gram from the drive train has the same effect on acceleration of taking 10 grams of static mass away from the car.

if you google the topic that 10:1 ratio keeps coming up...
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Old 09-02-2011, 06:29 PM   #8
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PRS, nice gears.
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Old 09-02-2011, 06:35 PM   #9
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Quote:
Originally Posted by @Art_Mighty View Post
... it's a somewhat fanatical desire to remove as much rotating mass from the drive train as possible. I'm not sure of the math on this one but from my understanding there's something like a 10:1 effect that rotating mass has on acceleration (as apposed to static mass). Taking away a single gram from the drive train has the same effect on acceleration of taking 10 grams of static mass away from the car.

if you google the topic that 10:1 ratio keeps coming up...
Thanks for that answer! I always had the aluminum pinion and regular plasitic 64 but never remember any difference in how I or the car performed. I'm guessing just a speed reflection cause perhaps there could be considered a gyro effect to some degree

Now we are getting complicated

Also you have the reverse effect correct? Does a heavier hear have more inertia hence needs less motor...lol

lol
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Old 09-02-2011, 07:30 PM   #10
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... it's a somewhat fanatical desire to remove as much rotating mass from the drive train as possible....
You will want to remove the wheels then.
They have so much rotating mass they will swamp any effect from a lighter pinion/spur
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Old 09-02-2011, 07:44 PM   #11
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With spec tires at most events, there is no advantage there, unless you start removing (3grams+) material from each plastic wheel and rubber tire with a tire truer ! Anyways, if you plan to reduce rotational weight accross the board , then Hirosaka Gears are a good choice !
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Old 09-02-2011, 08:29 PM   #12
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You will want to remove the wheels then.
They have so much rotating mass they will swamp any effect from a lighter pinion/spur
lol...Dude the wheel-less Rc car does't come out til 2013
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Old 09-02-2011, 10:36 PM   #13
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Hot Racing has some very light alum. pinion gears. Hobby Etc. carries them. They look very similar to the Trinity gears.
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Old 09-02-2011, 11:25 PM   #14
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Quote:
Originally Posted by Infinite 12th View Post
Thanks for that answer! I always had the aluminum pinion and regular plasitic 64 but never remember any difference in how I or the car performed. I'm guessing just a speed reflection cause perhaps there could be considered a gyro effect to some degree

Now we are getting complicated

Also you have the reverse effect correct? Does a heavier car have more inertia hence needs less motor...lol

lol
I was pondering the gyro effect with a colleague at work today so it's interesting you bring that up. As for your second point, I think any sort of flywheel effect is a bad thing considering it would help preserve momentum but at the same time slow down acceleration.
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Old 09-02-2011, 11:26 PM   #15
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With spec tires at most events, there is no advantage there, unless you start removing (3grams+) material from each plastic wheel and rubber tire with a tire truer ...
... also under consideration.
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