Poole Camp Friday

The day started grey and drizzly, but cleared up by launch time at 6pm to be a sunny evening with a steady F3 gusting F4 from the SW. Three boats ventured onto the harbour, Ged and Peter in the Storm17, Roy and Jenny in the Laser 2k and Steve, Mel and Mike in the Comet Trio. We headed straight to the harbour entrance on a steady broad reach and run, with Ged’s downwind performance outrunning the asymmetric spinnaker boats. At the entrance we had different ideas about how best to keep out of the way of the Cross Channel ferry, some sailing into the wind shadow and some crossing the deep waters to more wind. A beautiful beat into the sun, three up on the side of the Trio with the flood tide behind us soon had us at Pottery Pier. Then for fun we threaded the islands and landed at 8pm. It was a spectacular first sail in Poole this year.

Southampton Sailing Club

Cody Sailing Club have joined as associate members of Southampton Sailing Club. Cody members can gain access to the faciltiies at Southampton SC. A club Cody club boat is now stored there for members to sail there and to tow to other Cody events. Recreational sailing is on alternate Wednesdays. For details see here

Proctor 1974 Penultimate National 18 Capsize Test – two people

In order to be confident in sailing the National 18 as a day cruising boat with two crew, we wanted to be assured that it was possible to recover the boat from capsize with two people. The National 18 is a three person boat, so I was not sure whether a recovery with only two people was possible.

We took it to Bough Beech Reservoir and under the watchful eye of their club safety boat driver we conducted the experiment. The boat was cleared of all loose contents and made ready for capsize. There was no wind so we got deep enough by a tow in flat calm conditions away from the shore.

Preparing for capsize

At the moment of capsize, before the inside filled with water, the boat sat very high.

Just before the mast hit the water

And sat at rest for a moment (while, I imagine, the mast filled with water).

Now full, the boat settled bow down. The centreboard was too far above the water to be got on (righting lines would absolutely fix this, but would not, overall, help with righting the vessel with only two people)

This is the moment when I realised that the downward pressure of the rigging hugely overwhelmed my weight hanging on the end of the centreboard – I was being lifted powerfully out of the water.

The moment I realised that my weight was not even close to being enough to prevent inversion

Despite both of us hanging off the hull, the mast was heading quickly to inversion.

Both crew attempting to keep the boat level, and failing. The boat was well on it’s way to inverting.

At this point it became clear that two people are simply not enough to keep this National 18 with it’s mast level with the water, and the experiment was stopped and a third person joined us in the water to right the boat.

The boat became almost completely inverted, with the air escaping from the hull and centreboard as it settled with the waterline at floor level, and it was possible to get on the hull and onto the centreboard. It took the weight of two people on the centreboard to raise it, one standing and leaning back and the other hanging on to the end and pushing down.

Unfortunately, we had no one scooped in the boat for the first righting and it proved a point that I had speculated; with a ton of water above the buoyancy tank it would be unstable until drained., The weight of the water above the buoyancy made it highly unstable and it immediately capsized.

We established that it’s critical to have two on the centreboard to raise the boat and the third person must be scooped into the boat to dynamically stabilise it while it self-drains for about 30 seconds. The floor is about 2cm above the water line and the centreboard slot is level with the deck, so the water drains very quickly through the slot – a great safety feature.

It was easy to get back in. On shore there was little water in the buoyancy tanks.

Note: This experiment cannot be used to extrapolate to all National 18s. This is a 1974 Proctor hull which has been fitted with full length under floor buoyancy at the level of the centreboard case. We had no masthead buoyancy, and no righting lines, it was exactly as we raced it.

Conclusion: This National 18 cannot be raised from capsize by only two people. With both crew on the centreboard the boat will right and immediately capsize due to the instability due to the water above the buoyancy tanks. One person on the centreboard is insufficient weight to counteract the weight of the mast.