Guys, my PERSONAL interpretation of this scenario is that if you enter a regatta as a sloop with crew then the whole of the regatta should be raced that way unless there are exceptional circumstances. e.g illness or injury or pehaps if the intention to switch modes during the regatta was made at the time of entry and permission obtained both from fellow competitors and the PRO.

This situation has arisen in UK events and has been settled before racing began, for example where a crew has been unavailable for the first day of a weekend event.

I guess I agree with Robi!