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tuff righting manoeuver home | Fairlead | sailing glossary | buy a kit here
Tuff...
Sailboats on a cruise may carry small sturdy sails called ‘try sails’ that are used when they get caught in ‘a blow’. The normal sails would either cause a knockdown or be torn apart.
..Although not quite as small as a try-sail, this model has a modest sail area that still makes it go in light winds .
__The sail_________________
You need a hassle free rig when sailing in rough weather, things get fast paced with no time for adjusting stays and jibs. Here we have single stay-less sail with a straight leech (no battens), the plastic used is a bit heavier than the lightweight shopping bag thickness. The sail has a low CE that helps to reduce heeling. The boom rises upward from tack to clew to keep the clew free of the water when heeling on a reach.
The advantage of this method comes from the sail swinging (along the luff ) from one side of the mast to the other as the boat changes tack. Just like sails that use mast rings, only here we have short tubes instead. This minimizes the turbulent air bubble, and is much less trouble than laced on sails to remove and adjust.
The straw needs to be larger than the 1/4in dia. mast. I used a clear straw that lets the color of the mast show through, at a distance you cant even see the straws.
Tip -- Cut a strip of paper to find the length of tape you need, the length should go all around the straw sections and grip onto both sides of the sail with at least one half inch contact area.
To keep the sail in place, a short length of line with a stopper knot, slips through the straw at the head of the sail and attaches to the mast head, and at the tack it gets pegged into the hull with the mast. This only works if the straw is slightly larger than the mast in circumference, and the stopper knot will keep the line from slipping through. If the straw is too large, you can loop a length through the straw and attach as above.
Note: a peg was used on the deck to position the mainsheet under the sail's clew.
__The hull______________
At the stern, the hull’s ‘run’ has been increased to reach up to half the thickness of the hull. I faired in the chine and the run into the hull using a bench sander, wood planes will do the job without the noise and dust, but it will take a bit more time.
A few thin coats of spar varnish is applied over the hull and centre board, nothing fancy about this model, just good looking wood.
I made the rudder with an angled leading edge, to keep it from catching debris (sea grasses).
In light wind debris slows you down, when the sea is rough, you get knocked down.
See dealing with debris
Sailing out in the beach face with light winds on a hot day can be a mellow experience bordering the sublime. But when it gets rough, it takes intense focus on the instant, and on the impendent, such as oncoming waves. And you must tread carefully, on calm days you can see things like big rocks. Everywhere around you there is movement, wind, water. Add to this, being chilled to the bone, fumbling around with numb fingers, all make a few minutes of sailing feel like a personal victory.
(Unfortunately, it also results in crummy pictures...)
The sailing strategy is to take a wave head on (or directly on the stern) so that you have the length of the hull for stability. Wind and waves travel in the same direction, as you can sail windward, you will have to turn into the wind just as the wave approaches, this leaves you in a stall situation that you have to quickly come out of. Tuff was nimble enough to out manoeuver oncoming waves (most of the time :-)
rating - the model was designed for stronger wind, so in lighter wind
speed -fair tip: try not to touch the sticky side of the tape unless you intend to dispose the part that you touch, use the tip of a toothpick or a pencil to move and position the tape instead of your fingers.
'Tuff' gets its name from
Toffino
a town on British Columbia’s west coast,
I travelled there a couple summers ago (08) and made a couple models ‘Tuff and Uke’
to take.... but more on that in a future update... __The righting manoeuver________
Once when retrieving this model after a wind knockdown, it suddenly righted itself.
This has happened before (very rare) with other models, I considered it a fluke caused by wave action.
But, I noticed it happened with this model often.
Its secret was in the run of the hull, ‘run’ describes the upward slant of the bottom of the hull at the stern.
That run on the hull will generate lift when the model is pulled backward, and when it is pulled upward at the same time, a firm steady pull can self right the boat.
This can be accomplished when capsized on its side, but if the sailboat has ‘turned turtle’ that is, completely upside down, it doesn’t work, the hull will just dive under.
The pull should be made after the slack in the line is taken in, and the pull should be progressive,
pull lightly at first, holding the line well in front of you, then sweep the arm back and (careful) step backward..
You want to get lift generating under the stern without too much strain on the line, build a little momentum up first.
It also helps to be upwind of the model, when the model is righted you are not as likely to get knocked right back down again. |