If the wind was very shifty and I didn't want to rig a preventer.
Not only easier with shifting wind, but if you're sailing in a restricted passage you may not have the room to come into the wind to lower your main. If you're sailing to a dock at a "dead end" channel, etc. 'take care and joy, Aythya crew....I see a lot of boats on the ICW that run a genoa. It's easier do roll it up if the wind is shifting......Dave
Trim it. Over trimming the main when off the wind will depower it. Depending on the conditions you may not be able to depower it enough, but that's a different discussion.When in tight conditions with the wind anywhere abaft the beam, sailing with a main is dodgy because you can't depower a main.
Trimming also causes the problem of making the boat much harder to steer because it will be trying to round up. It will depower and is a great technique when needing to go from a dead run to facing the wind very quickly like when anchoring against a lee shore. It is also great if you just need to depower for a little bit but it does make a lot of boats hard to handle.Trim it. Over trimming the main when off the wind will depower it. Depending on the conditions you may not be able to depower it enough, but that's a different discussion.
I was always under the impression that running just a headsail in heavy air put a lot of awkard pressue on the rig. Any truth to that? Or would a heavily reefed/furled headsail negate the worries?The third is when the wind really gets tough and the second reef (my last isn't deep enough) the main comes down first and we sail for as long as we can on the jib.