Rog, the rules are not undefined. It is clear what the BRCA specs are, so be in no doubt and buy stuff which complies with the BRCA 2-cell requirements. Or 1-cell if you prefer. You will not be at a massive disadvantage to anyone running non-BRCA at Gloucester, such as me. It's pretty clear from the results that the 21.5 boys are well on the pace at our club.
Reading around the forums and speaking to people, it looks to me like 1-cell was instigated and popularised by the ex-1/12th scale drivers who wanted to try the class and already had the 3.7V electronics. They have sway with the rulemakers. Most if not all others have a preference for the way the 2-cell set up drives (and costs). Like I said before, I would not be surprised if the 1-cell format dwindled and disappeared.
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