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Old 05-16-2014, 02:07 PM   #931
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2s LiPo for 1/12 scale (1s case size), 155g:

http://www.amain.com/product_info.ph...ts-74V-3200mAh
Hadn't seen one of those. Interesting, I know when we tried the shorty 1s they were down on power. Same goes for the shorty 2s that we run in F1 compared to a full size. For what ever the reason, they just don't have the punch even though the c rating is up there. As we do know that rating is the safe discharge rate not the ability of the battery to provide the actual volts.
A interesting comparison was a pair of batteries in my USGT car. Same motor and gearing. After a 6 minute qualifier the 65c/4600 mah shorty was 7.7v the full size 65c/7600 mah was 8.0. And as expected faster fast lap and much faster at the end of the run.
But a mute point as I haven't seen 2 cell 1/12 scale ever. I was at races where 6 cell was run but as speeds increased that went away.
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Old 05-16-2014, 04:48 PM   #932
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The majority of racers I talk to about 12th, don't like the foam tires
Do you think that if a stock class was offered with a spec tire then it would encourage more people to consider having a go?

We're in the middle of a big debate about spec 1/12 tires in the UK right now. There are obviously many pros and cons to the idea and there is a real divide among existing racers. Lots of them are very stand-offish about the whole concept of it, whilst others keep an open mind and consider the potential merits.

Someone mentioned rubber 1/12 tires in Japan - have they got a link to where I could see/buy some please?
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Old 05-16-2014, 05:39 PM   #933
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Do you think that if a stock class was offered with a spec tire then it would encourage more people to consider having a go?

We're in the middle of a big debate about spec 1/12 tires in the UK right now. There are obviously many pros and cons to the idea and there is a real divide among existing racers. Lots of them are very stand-offish about the whole concept of it, whilst others keep an open mind and consider the potential merits.

Someone mentioned rubber 1/12 tires in Japan - have they got a link to where I could see/buy some please?
Hi Mark

Foam tire hot topics among the non-12th crowd
Truing
Changing ride height
roll out

Does a spec foam solve this ?
Also for most tracks, there is already a spec-ish setup
Black/Yellow

Offered to test spec 12 tires, but have yet to see any

For GT300 info
Check your pm's

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Old 05-16-2014, 06:20 PM   #934
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That was the problem way back when people were considering doing 2s with a 380 motor. The concept was good, but the only sensored 380 motors were made by Novak, and the winds available were WAY too much power for the average driver.

FYI, some rules of thumb are:

Power increases as the square of voltage. (Doubling the voltage gives four times the power, all else being equal.)

Power increases as the inverse square of motor turns. (Halving the number of turns gives four times the power, all else being equal.)
The Novak motor spec chart suggests an overall relationship much closer to a doubling of power when halving the number of turns. With some variation through the range and with specific pairs of course.

3.5T: 620W
4.5T: 530W
5.5T: 420W
6.5T: 390W
7.5T: 340W
8.5T: 280W
10.5T: 235W
13.5T: 195W
17.5T: 130W
21.5W: 85W

NOVAK BRUSHLESS MOTOR SPEC CHART
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Old 05-16-2014, 06:45 PM   #935
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Originally Posted by RedBullFiXX View Post
Hi Mark

Foam tire hot topics among the non-12th crowd
Truing
Changing ride height
roll out

Does a spec foam solve this ?
Also for most tracks, there is already a spec-ish setup
Black/Yellow

Offered to test spec 12 tires, but have yet to see any

For GT300 info
Check your pm's

That is beyond cool.
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Old 05-16-2014, 09:40 PM   #936
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what chassis is that?
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Old 05-16-2014, 09:54 PM   #937
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They are Yokomo R12GT300 cars
Been around since 2011

http://www.teamyokomo.com/gt/lineup.html
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.
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Old 05-16-2014, 10:10 PM   #938
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I totally forgot about the GT300!

I actually had the chance to drive one of these GT300's around my local track. It was running a 21.5 motor or faster (13.5) 2 cell with kit or Kawada rubber tires, I forget. Surprisingly, it hooked up really well on prepared asphalt and I would imagine they would work just as we'll on carpet.

I'll try to see if one of the guys can bring one tomorrow and drive it around the track.
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Old 05-16-2014, 10:34 PM   #939
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that would be a hit here

*good thing I can't read Japanese
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Old 05-16-2014, 11:48 PM   #940
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Paradoxically, it seems almost that as RC racing has gotten easier, some of the appeal is gone. 1/12 scale has never been easier, touring car has never been harder, and which is gaining followers faster?
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Old 05-17-2014, 12:35 AM   #941
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Desert rat you bring up a good point, why is 1/12th so small compared to 1/10 tc when it has so many advantages? i am not sure but i do know when i was considering which to get over a year ago all the LHS' told me to go 1/10, in hindsight this is probably because they can make more money out of 1/10.
all less experienced or novice probably believe it is too hard and because 1/12 is rarely seen and needs more delicate conditions to operate most people are wrongly scared off. also i believe the 2wd vs 4wd factor plays a part too for newbie and intermediate, maybe im wrong but all i know is that i live in a city of nearly 5 million people and there is only 1 regularly run 1/12th class vs several 1/10 tc classes.
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p.s them rubber tyred 1/12ths are definitely beyond cool
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Old 05-17-2014, 12:59 AM   #942
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Originally Posted by RedBullFiXX View Post
For GT300 info
Check your pm's

Hi RBFF

Would the front/rear wheels and tires of GT300 fit to common 1/12th's front/rear axles ?
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Old 05-17-2014, 02:57 AM   #943
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that would be a hit here

*good thing I can't read Japanese
My question is...why would that be a hit on a 1/12th pan car chassis when it isn't on the myriad of other chassis that can already run that style of body?
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Old 05-17-2014, 07:16 AM   #944
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Originally Posted by Dave H View Post
The Novak motor spec chart suggests an overall relationship much closer to a doubling of power when halving the number of turns. With some variation through the range and with specific pairs of course.

3.5T: 620W
4.5T: 530W
5.5T: 420W
6.5T: 390W
7.5T: 340W
8.5T: 280W
10.5T: 235W
13.5T: 195W
17.5T: 130W
21.5W: 85W

NOVAK BRUSHLESS MOTOR SPEC CHART
The squared relationship is most accurate for low-power, high-turn-count motors. Plenty of other things creep in to change the relationship as power levels increase. One biggie is the internal resistance of the battery. I'm guessing that the Novak results include this, and probably maintained the same battery resistance for all tests, which is not the situation we have. The 2s-LiPo-in-a-1s-case that I linked to earlier would have four times the internal resistance as a 1s with the same energy density (since the cells would be connected in parallel internally, rather than in series).

The Novak numbers indicate a factor of 2.76 difference in power between 21.5T and 10.5T motors, but only a factor of 1.79 between 10.5T and 5.5T motors. One could probably come up with a pretty good estimate of the internal resistance of the battery they used if the motor resistances were known.
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Old 05-17-2014, 11:03 PM   #945
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Hi RBFF

Would the front/rear wheels and tires of GT300 fit to common 1/12th's front/rear axles ?
Rear are hex hub
Front are unique size as well


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