An Aerorig does not allow enough shift forward in the CoE to enable reliable tacking in a HP. So motoring is inevitably required to bring it around. I expect it would be possible with a schooner rig to sail through a tack. When sailing lw to wind there is a tendency for lee helm meaning it is possible to sail high on the wind without risk of luffing; somewhat more relaxed in light winds than sailing ww to wind where speed under 3kts when on the wind will result in rounding up without control.
One of the issues to be aware of is the boom coming over the deck or even the cabin. On the 18m proa the trailing end of the boom wipes out solar panels if it is allowed to sweep over the cabin because it is lower than the leading end. When considering the schooner rig for the 18m proa, one attraction was to set the booms close to the deck of the lw hull to improve span efficiency while keeping the booms short enough to clear the cabin.
Rick
On 24 Feb 2019, at 10:03 am, Mike Crawford mcrawf@nuomo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:I completely agree, though I'm not sure it's fully feasible.
My main reason would be to short-tack to windward without having to touch the sails on a schooner rig. Kind of like tacking in a mono with a self-tacking headsail -- turn and go. We're about five miles from truly open water, and parts of our inlet are just 1/4 mile wide, so that's a lot tacking if we want to skip the motor. Hours worth.
Shunting would be the way to go in really light winds, when no multi would come about, and in big winds, where it would be nice to avoid the stress. In the middle, just coming about would be awesome.
However, that might require more rocker than we'd want in a proa. A cat is easy to set up, even with rocker, by balancing out the weight, but the proa needs to be bidirectional. If we want to keep the bows up, we might want less rocker, which also would be a benefit in terms of reducing leeway using the hull.
I pretend that I'd be able to come about in 5-15 knots, perhaps sheeting in the aft sail in the first half of the tack, and the foresail in the second half of the tack, which could be done by hand with a 2:1 mainsheet without having to change the setting on the winch/cleat. Pull, release, pull, release.
I also plan to use deeper foils most of the time to really grab the water when steering and resist leeway when beating. Maine waters tend to be either deep or not, so an extra foot or two is fine. That could also help tacking.
But I'm not sure I'm being realistic.
__._,_.___
Posted by: Rick Willoughby <rickwill@bigpond.net.au>
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a new topic | • | Messages in this topic (4) |
SPONSORED LINKS
.