I’ve been
studying flopper stoppers and various ways to prevent the boat from rolling uncomfortably
with swell. We plan to anchor out a lot
this summer and the Med is well known for rolly anchorages. I want to avoid any system that requires hanging
something out from the side of the boat using the boom or spinnaker pole. This is certainly the most stable
configuration, but if you leave the system set up overnight, you have to put a
light at the end of the boom to signal its presence. We also suspect that many or most of our
anchorages will be very crowded, and having a system poled out while inexperienced
“credit-card captains” try to squeeze into tight spots right next to your boat
gives me nightmares. I want something
that is simple to install, something I can leave installed while going ashore
without worry, and, most importantly, something that can be uninstalled quickly
in the dark at 2 a.m. when you have to leave the anchorage in an emergency
The photo theme is "Paris by the Sea, part 2": nautical-related art and artifacts seen around Paris.
| Arsenius' planispheric astrolabe (1530), Museum of the Centre National des Arts et Metiers, Paris. |
I’ve only found 2 systems that don’t require poling out: the Mexican hat cones and the butterfly pole.
The Mexican hat
or inverted traffic cones system is a series of plastic cones that look like
flattened traffic cones (or sombreros) that you hang over both sides of the
boat. With the hats pointing down, they
offer little resistance against the water as they descend, but as they are
pulled up with the roll of the boat, the hat captures the water and resists the
roll. For Mareda, we would need a series
of 5 on each side with a weighted line.
There are a couple of problems:
storage is not so simple for such a bulky configuration, but more importantly,
there is a problem of inertia that reduces its efficiency. As the boat rolls and pulls the cones up,
they resist but are still displaced upward a bit. As the boat rolls back in the other
direction, the cones sink, but generally not as fast as the boat rolls (unless
you have a large amount of weight on the line, and I don’t particularly want to
heave 15 kilograms / 33 pounds up by hand at 2 a.m.). This means that by the time the next roll
begins, the hats have not fully descended and there is some slack in the line
before they catch. The cones alone cost
180 Euros, to which you have to add line and two 10-12 kg weights.
| Another astrolabe from the CNAM museum whose name I entirely failed to record. |
The butterfly pole is something I’ve read about elsewhere but have only seen developed by our local Mediterranean sailing guru, Pierre Lavergne, based on his 15 years of sailing in the Med and having tried everything. Last year, Pierre convinced us that a riding sail was a necessary piece of equipment to avoid the windshield-wiper effect that stresses boat, anchor, and crew in windy anchorages. That simple sail greatly improved the quality of several anchorages this past summer.
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| Sundial, Cluny Museum of Medieval Art, Paris |
In French,
Pierre’s system is called the “parahoule” and it consists of a rigid pole of three
sections with a total (adjustable) length of about 3 meters (9 feet) with large
articulated spade-like blades fixed at the bottom. The pole is fixed to the balcony or
stanchions and rails. As the boat rolls
towards the swell, the butterfly blades fold to reduce resistance and the rigid
pole ensures that there is no slack in the system with no need for
weights. As the boat rolls with the
swell, the blades fly open to resist the roll.
By putting one butterfly pole on either side of the boat (and the poles
can be placed anywhere to balance the swell coming from directions other than
straight a-beam), the roll is significantly dampened. Pierre says it won’t dampen out all swell
completely but will make the difference between a gentle rocking and a sickening
sleepless night. Pierre’s system costs
165 Euros, all included, for 2 poles, the system breaks down to 1 meter / 3
feet long, and weighs about 7 kilos / 15 pounds, easy to transport in our
luggage. The system can be quickly
hauled out of the water and fixed along the life lines while sailing between anchorages
– no need to completely disassemble and store it below.
Pierre's web-site is a goldmine of information (best if you read French) and he has fully described the parahoule on a companion site. I’m eager to try
this out (well, I would rather have perfectly calm anchorages, but…). We'll make a full review as soon as we have some experience with it.
| One of the world's largest Topazes from Brazil. No, this has nothing to do with navigation, but it sure is pretty. |
















