heave to comments..
I usually think of "in irons" as not being able to complete a tack because the boat's momentum was insufficient to carry it through the "dead zone". On occassion I have purposely put my sloop in irons so I can go forward and change the headsail. This is easily done by letting the tiller go and trimming in the main. Without the rudder steering and no jib to conteract the main the vessel will constantly put itself in irons. The main will have a weathervane effect, the boat will round back up into the wind whenever she starts to fall off. The downside to this is that it is usually a bumpy ride when facing directly into weather. Going down wind and changing the sail in the lee of the main is much smoother, but now the boat is moving so someone on the helm or a reliable autopilot is needed.So... how do we heave to without using the jib? One answer is to push the main out all the way, rig a preventer and set the sheet to hold it steady, then let the windvane effect take over as the vessel sits hull abeam. For example, watch the racing dinghys on the starting line, waiting for the gun.On my C27, heaving to with main only is a bit more difficult because the rear shrouds don't allow the boom to be extended out 90 degrees. Even so, with some determined tweaking I have had some success here. The downside on this technique is that now the main will often rub against the rigging. Geez...can't a sailor get a break?Regarding Jonathon's concerns about lying to head on versus lying to abeam: I think the boat will find its own comfort zone if allowed. Many sailors set the sea anchor with a bridle that allows them to adjust the angle the hull sits to weather. The boat is then set to its most comfortable and secure position. One more comment, regarding backwinding. It is not recommended that you heave to with a genoa, or any headsail over 110%. Besides the rigging quickly doing a lot of damage to the sail, you'll find it easier to balance the boat with the blade, #3, working jib (whatever you want to call it). For those with furlers, roll up the sail enough to at least keep it off the rigging.