Flying an undeclared oversized jib as a spinnaker
I have been asked if a boat that has declared a 150 as largest genoa with a standard spinnaker can use an undeclared sail (170 genoa) not as a genoa but flown as a spinnaker.
the words were "flying my 170 but like a spinnaker, with the Tack poled out to windward on the spinnaker pole and of course not hanked on".
Does a boat that does this with a sail that has the hanks on the sail but not attached have to declare this as an oversized headsail? Even if not ever intending to use as a genoa in a race?
Is this legal to fly as a spinnaker given the construction of the luff ona typical 170 genoa?
Are there other considerations?