Chinese Gybe - when it all goes wrong....worth the read...

StellaGirl

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If ever you wanted to know how horribly it can all go wrong when you are pushing flat out in big winds and big seas in a VOR70, read this from Ericsson, “When running downwind in these boats in 25 knots we carry a full size mainsail and a spinnaker that is 500 sq m, which is all fine when you are sailing away from wind at 20 knots, but if you lose control of the boat, which can happen very easily, you normally broach - which means the rudder doesn't have enough grip to keep you going straight and the boat rounds up into the wind uncontrollably. A broach in itself is a mess, with a huge spinnaker now seeing the full force of the wind as you round up almost head to wind. The thing flogs violently and is in great danger of destroying itself.

“We broached last night with everything up (full size main, spinnaker and staysail).

“Sat in the nav station I hear the rudder stall first; a huge rush of air under the boat as it looses its grip on the fast flowing water. This is accompanied by a very quick change of heading and a large heel angle.

“Last night I was talking with Neal in his bunk when suddenly you felt we were going to loose it; I rushed for the hatch, expecting to find the guys rigging the chute to drop it, (it was the sail that we destroyed two days into the race which cost us so many miles before the first ice waypoint) but it looked like we might recover. The key to getting out of a broach is to maintaining some forward speed; the rudder is the only thing that turns the boat and it needs water to flow over it to work. I heard someone shout that we still doing four knots and you could feel the boat slowly getting back under control.

“As you bear away things happen really fast; the mainsheet, spinnaker sheet and vang are all blown quickly to try and prevent the broach in the first place and now you need to get the sails under control quickly. If it all works well you are off again downwind at 25 knots and, providing the sails are in one piece, you have a lost some distance but nothing more.

“Last night unfortunately did not turn out like that.

“We recovered the broach and got going downwind, but then a series of very quick events lead to us Chinese gybing.

“We got going downwind, but could not get the sails trimmed on quick enough which means they have a tendency to make the boat lean the opposite way to normal. When it does this, it wants to turn dangerously to leeward and as we hit the bottom of the first wave, you could feel that we were going to go out the wrong way.

“The scariest part was looking up at the boom which was pointing nearly vertically by now and knowing that within seconds the mainsail would gybe uncontrollably. The sail, the ropes attached to it and, more worryingly, the boom itself come across with such phenomenal power that anyone in the way would be lucky to survive.

“The problem is magnified massively by the fact that our canting keel is no longer helping to keep us upright, but actually contributing to heeling us over. Combined with tons of kit now on the wrong side, the boat lays over to about 70 degrees and the mess on deck is completely indescribable. Everything is on the wrong side, the mainsail is pinned against the runner and every single rope is a tangle heap of spaghetti in the cockpit, which is now full of tons of water.

“It’s amazingly disorientating trying to work out where to stand and which winches and ropes you are after. First job is to make sure we still have everyone and no major injuries, and at that point things start to happen very slowly.

“The next thing is to get the keel back in the middle. Fortunately the race organizers are smart enough to make us have an automated button to do this. You can't start the generator; it’s a gravity feed fuel system and the cooling inlet would be three feet in the air. The batteries kick in a DC motor which moves the keel slowly but surely to the middle. You only have to press one button to do it, but its now above your head where you aren't used to it and it takes a couple of minutes to find it, when it normally takes a couple of seconds.

“At this stage you need some careful thinking to get out safely with the minimum of damage; moving around is painfully slow and fairly dangerous so careful planning is the order of the day. The list of tasks is long and I won't describe everything here, apart from to say that it took two hours to get upright and get sailing again, albeit slowly.

“Boats normally suffer lots of damage in one of these events; SEB in the last race lost their mast when they did it and you normally expect broken sail battens and blown out spinnakers. Remarkably, everything survived and a few hours later we were back to full speed.

“It cost us a fair few miles, and with the forecast not playing out as I would like, we find ourselves behind the Brazilians and loosing to the leading three. It's been the hardest 24 hours of the race for all of us and the brutal facts are that with 2,000 miles to Cape Horn this sort of drama is far from over.

“It’s starting to feel properly cold now and we can't use our heaters as a charging problem is chewing through our diesel at a higher rate than we planned for. The whole crew is exhausted and yet we need to push harder to stay in the hunt.

“A day like today will be hard to forget and although I know we will laugh about it one day, right now it sits as a reminder of how close to edge we are.

“Suddenly, Life at the Extreme doesn't seem like just a catchy slogan.”
 
In my student days, when racing my Entreprise I have been in exactly that situation. But only in a dinghy, and that was scary enough, but we were only deposited into the north sea.

Compared to what these guys went through, it was like a sunny day on a boating lake!
 
That must be something else. I've done it at 30 kts wind sailing close to the lee with kite up pinching a mark. Helluva bang and then flat in the water with a couple of crew about to depart off the back.
Yep, you can keep that now.

Good post
 
Re: Chinese Gybe - how did that happen

I have chinese jibed a junk rig boat
-really didnt think it was possible to do that-
Instead of the whole rig swinging gently across,it all decided to go vertical(and pearshaped) and brailed itself up at the mast,really weird,I thought all the wooden battens/booms would pop and break..,tried reverting to the old gybe and it sorted itself out.
Only ever managed it once
 
Re: Chinese Gybe - how did that happen

I've experienced a chinese gybe twice whilst on a racing boat. Lost the rig on on of them!
 
Experienced this when doing a yacht race on the Pacific side of Vancouver Island. Being one of the trimmers one of my jobs was releasing/tensioning running backstays. Course in a chinese gybe the main comes over onto the tensioned one and it's bl$$dy difficult trying to kick it out of its jammer when you're healing so far over it's well under water.
Still, gives you lots of confidence in the boat when it recovers from one of those with no damage.
Did take us about the next 30 miles or so to recover a tangle of guys/sheets from round the keel.
Would still love to do it again though (the race not the chinese gybe!) /forums/images/graemlins/smile.gif
 
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