Hi Edward,
Can you please tell us the background of the rule change in general?
It sounds like that the government wants to limit the max capacity of all batteries and not only hobby grade.

Thanks
Denis

If this regulation was to follow through it would only affect the Japanese market. I don't know a whole lot on this topic, but from what I've heard it's simply for safety reasons.

Once again, from what I've heard, this is only for Japan.

Interestingly, Japan has strict regulations regarding fire and safety for indoor facilities. For example, CRC Black carpet is not allowed to be used due to the carpet materials being highly flammable.

Bring on the 2S!

Maybe it was postponed because all of the available packs already are below the limit... or 400Wh/l is not the correct value... or my calculations are goofy (that's never happened before! ).

Why? What's the draw of 2s?

About half that of a 1s.

I'm joking. From a strict power sense making power with 2s is easier on your ESC. AZ_Wolfie and I have run mod 1/12 against each other, he runs a 2s and an 8.5 turn, I run a ROAR setup of 1s and either a 4.0 or 3.5 turn. The power generated is equal, but I make much, much more heat with the 1s pack in the ESC and battery. I have to run a no-motor-limit ESC with a fan or I will get a thermal shutdown, where with the 2s setup runs a Tekin ESC and no fans.

After the race the top of my cars body is warm to the touch, as is the bottom of the chassis. That still boggles my mind, how I draw 6600mah in 500 seconds of run time for an average amp draw, not peak average over the whole run, of 47.5 amps with the 3.5.

But that's for mod. How many guys run 17.5 for every one guy that runs mod?

It's not like the mod guys are melting the solder joints off their ESCs as it stands. I understand the battery gets quite warm and the ESC extremely hot in an 8-minute mod run. If we negate that by making 1/12th scale 2s that means we will need to implement another motor as the stock class motor since 17.5 2s will be equivalent to 8.5 1s and too fast for some tracks and many drivers. All of our 1s specific batteries and speed controls will become paper weights. Even some of us that use 1-cell capable servos will need to toss those as well. So to alleviate some wear and tear for the 20% the suggestion is to make 100% of people that run the class shit can their entire powertrain and start from scratch?

That depends on the mah and the c ratting.

Well IMHO the appeal(not the need) is power, simplicity, safety, ease of entry to the catagory, and cost.

I will run what my club runs. Which is 1s. No big deal.

But i'd love to promote the catagory to outsiders that may have half the components and just need a motor/batt/roller. Lots of the off roaders loosing clay tracks, drifters and crawlers getting bored and nitro racers who come inside for the winter. 1/12 2s 25.5 could possibly be a good entry. I obviously dont know for sure, but I'd love if it was!

Possible new blood have so many classes to choose from, there shouldnt IMHO be a need to make one of the most genre defining classes harder to get in to.

Ive been dipping in and out of 1/12, f1 and touring since the mid 90's. This entire topic is just my opinion as a relative outsider looking in.

I'd guess that there aren't many off-roaders or drifters that already own a 25.5 motor. So then they would be looking at buying a $90 motor versus a $10 voltage booster or a $50 1s-specific ESC. I'd also guess that none of them would already own a LiPo that would fit in a 1/12 scale car, whether 1s or 2s.

Several people have pointed out that 25.5/2s and 13.5/1s are close enough in speed to run them together. How many of the guys already running 1/12 scale in your vicinity run 13.5?

BINGO!

No one has been able to provide sound reasoning for wanting to switch 1/12th scale to 2s. Boosted 3.5 is only handled by the most skilled drivers. It's not like we are searching for more speed.
While components are getting hot, I don't see reports of high failure rates of any electrical components running mod 1s.
We currently have batteries with plenty of capacity to make run time.

I really think some of you are trying to provide an answer to a question that no one asked.

The reason for proposed 2s 1/12 scale is from the manufacturers

They are tired of creating 1/12 specific esc' at a great cost when 1/12 is not exactly the booming class it used to be.

I’m ok to run 1S amd 2S 1/12 and don’t understand why’s there a fight bracking loose every time someone brings this 2S 1/12 up.
I know that many people run a 1S specic esc and are afraid that it would be rendered worthless with 2S. The most 1S esc’s can be used with 1&2S.
The most racers are changing the motor and battery at least twice a year and therefore a change to 2S would be manageable for the most.
Again I’m ok to run 1 and 2S, and don’t advocate for a change to 2S.
I would say that we are opening 1/12 to 2S and run 1&2S in the same race; like 17.5/30.5 & 13.5/25.5. This will allow us to get some experience with 2S stock and we can make a more scientific decision of a possible rule change.
That are my 2 sents.
Thanks,
Denis

Had this discussion with Bruce from speedmerchant. 2s 21.5 huge in Japan

Me and my race announcer at 360v2 in New York ran 2s 17.5 on spec tires was amazing and controllable power. Be a great 5 min class. Easy on tires. No need for killer cells. Lotta fun
Maybe even a spec locked timing motor. Like a 13.5 hw or something.

Yes, 21.5T/2s is massive in Japan and drivers of all skill levels take part in this class and enjoy it very much. I race this class here in Japan and it's a lot of fun and there's no need for any specialized equipment.

Check out one of the A-mains at this years JMRCA 1/12th Sports Class Nationals.

https://www.youtube.com/watch?v=KjfShizFwOc

If I were to start a 2s class I would stick with a 21.5T.

I imagine 2.4ghz, lipo and brushless all started with a question of "why?"