So what class rule excepts Rule 52? Certainly not any of the ORR rules. Unless it is spelled out explicitly that the rule or parts of rule 52 does not apply it applies. There aren't time penalties for breaking a fundamental rule. As stated before there is no penalty for motoring- you are out. Same for the autopilot. Use it and you are out.
Ignorance of the rules doesn't cut it. ORR class rules don't allow it either. http://offshore.ussailing.org/Assets...ok+June+22.pdf