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Old 10-07-2010, 10:52 AM   #1
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Default Capricorn 1/8 Competition racing car

Cad photos on redrc.net
A quote from Redrc.
A super low centre of gravity aids the handling, while ease of access to all the parts and an intuitive and fast set up system make the car enjoyable to work on. They expect to perform further testing and development in this final part of the year and aim to have the car ready for the start of the 2011 season.
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Capricorn 1/8 Competition racing car-capricorn8th-3.jpg   Capricorn 1/8 Competition racing car-capricorn8th-1.jpg   Capricorn 1/8 Competition racing car-capricorn8th-2.jpg  

Last edited by Got the grip; 10-07-2010 at 11:20 AM.
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Old 10-08-2010, 01:07 AM   #2
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Super low center of gravity? How much lower can it get then the current crop of cars?
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Old 10-08-2010, 06:04 PM   #3
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Super low center of gravity? How much lower can it get then the current crop of cars?
There is always room for improvement.

Just take a look at how low the 2-speed axle is and how small the gearbox is.
Also the bulkheads are small and low.
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Old 10-09-2010, 08:44 AM   #4
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Maybe it's just me but it seems that putting the first gear spur the same height as the bottom of the chassis is asking for trouble. I'm sure most people will find scratches on the bottom of their chassis so you'll run the risk of the spur gear touching the ground. After some testing, i'm guessing that will change.
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Old 10-12-2010, 02:53 PM   #5
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Maybe it's just me but it seems that putting the first gear spur the same height as the bottom of the chassis is asking for trouble. I'm sure most people will find scratches on the bottom of their chassis so you'll run the risk of the spur gear touching the ground. After some testing, i'm guessing that will change.
Many modern cars have the first gear at the same height as the bottom of the chassis, Xray NT1 for example, and haven't heard of anyone having issues chipping teeth or damaging spurs.

The reason why the entire 2-speed axle assembly is lower is because Capricorn changed the spur/pinion ratio which allows them to use much smaller diameter gears.
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Old 10-12-2010, 02:59 PM   #6
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Many modern cars have the first gear at the same height as the bottom of the chassis, Xray NT1 for example, and haven't heard of anyone having issues chipping teeth or damaging spurs.

The reason why the entire 2-speed axle assembly is lower is because Capricorn changed the spur/pinion ratio which allows them to use much smaller diameter gears.
That means the internal ratio would have to be changed.

So you either make the rear pulley bigger, which raises the rear axle, negating much of the advantage of lowering the two speed shaft, or you make the drive pulley smaller, reducing belt wrap which means easier to strip a belt.

Not saying these will be problems, I have no idea as no one has even seen the car much less run it, just talking about theory.
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Old 10-12-2010, 03:31 PM   #7
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The NT1 and LAB-C01 have the same internal drive ratio, but the LAB uses smaller (as in less teeth) spur gears to accommodate a 2mm drop in the 2-speed assembly height. Your post is over thinking the solution to this...

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That means the internal ratio would have to be changed.

So you either make the rear pulley bigger, which raises the rear axle, negating much of the advantage of lowering the two speed shaft, or you make the drive pulley smaller, reducing belt wrap which means easier to strip a belt.

Not saying these will be problems, I have no idea as no one has even seen the car much less run it, just talking about theory.
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Old 10-12-2010, 03:35 PM   #8
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That means the internal ratio would have to be changed.

So you either make the rear pulley bigger, which raises the rear axle, negating much of the advantage of lowering the two speed shaft, or you make the drive pulley smaller, reducing belt wrap which means easier to strip a belt.

Not saying these will be problems, I have no idea as no one has even seen the car much less run it, just talking about theory.
I think I misstated.

An Xray NT1 uses an 59 spur with a 17 pinion.
A Capricorn Lab C01 uses a 52 spur and a 15 pinion with the same internal ratio.
This gives the same final drive ratio but with different amount of teeth of the spur and pinion.
And a smaller spurgear, so the possibility to lower the 2-speed axle.

With the modern composites used these small gears aren't an issue anymore in terms of wear and reliability.
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Old 10-12-2010, 05:20 PM   #9
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I think I misstated.

An Xray NT1 uses an 59 spur with a 17 pinion.
A Capricorn Lab C01 uses a 52 spur and a 15 pinion with the same internal ratio.
This gives the same final drive ratio but with different amount of teeth of the spur and pinion.
And a smaller spurgear, so the possibility to lower the 2-speed axle.

With the modern composites used these small gears aren't an issue anymore in terms of wear and reliability.
Yeah that's doable but such small pinions (we go down to 15 with conventional clutches already) may require a smaller clutch bearing. I am not a fan of 5x9 in 1/8th but hey, I've done it before (Picco Integra) so might work.
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Old 10-12-2010, 05:25 PM   #10
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Plus, I just did an admittedly rough count through a blow-up of the cad drawing and came up with 50 so unless the pitch is smaller, it's the same size gear as everyone else uses.
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Old 10-12-2010, 07:14 PM   #11
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Is it me or does it look similiar to the serpent 966 but I would imagine it will have some really good lt weight parts
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Old 10-21-2010, 01:02 AM   #12
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Anymore updates?
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