I like to read the 12th scale thread from time to time because.... well dugh.... I manufacture 12th scale kits. Being that I just stumbled onto the lipo/bl topic yet again, here's some of the results I have come up with: I have purchased just about every Mamba 380 sized motor for my little Frankinstine project. I quickly found out the 8kv was ridiculous,
the 5.4kv was still stinking fast,
but the 3.6kv may actually be slightly slower then a 27t.
A 4.2kv maybe perfect for all around play. Oh, btw... my car weighed in around 410g. One thing to note is the heat in the motor that will be generated. The 5.4kv is probably close to a 3.5 w/ nimh..... you know.... slightly insane. But if you take that same motor and add the weight of a 2C 4000mah lipo (mine is a 1550mah), the weight factor may burn the motor up.... but if it didn't, you should be able to run for about 23 minutes.
Also, there are those in "asphalt town" that have tested light cars like this and they can not get them to hook up. So before we go down a path of: "what if we build this....." consider that it needs to work on all formats to be an effective chassis for all in order to justify selling/building it.
Something that I have been doing a little research in is the lithium ion cells for 12th scale. Just skip the whole lipo thing. Lipo will be old tech by the time we get it figured out for 12th scale anyway. The lithium cells come in about 3.6v and have a broader range of shapes they can be produced in. It would not be too far fetched of an idea to have 2C li-ion with a 17.5 for a mod class and a 21.5 as a stock style class. This would be off the shelf equipment, no rx packs needed with the 1C concept, just a little time and research will be needed into the new cells for shape and weight.
Brian-Slapmaster Tools