Originally Posted by Kenomac
How about this? Does this video demonstrate pounding?
Listening carefully, Ken, it sounds more like the pounding that a flat bottomed monohull
may do when being motored directly into head
seas. A monohull with a flat bottom forward of the keel
will do this quite badly, while a monohull with a more rounded or even V shaped sections forward of the keel
will hardly pound at all.
Most cats don't do this sort of pounding because their hulls are usually comparatively narrow and rounded forward of their keels, but I think that's what we are hearing, here. What cats do is slam, and that's the sound made when a wave hits not the hulls but the underside of the bridgedeck. It's generally much louder than the sound in the video, but much less frequent. In the video, the sound comes on every wave and every pitch
of the bow. I don't know the design of this boat but it is unusual to have a cat slam on every wave, and the waves don't even look that big.
All this said, whether a monohull pounds or a cat slams is often up to the skill and decisions of the helmsman. In either case, heading a bit off the wind
changes the motion considerably, as well as the effective distance between wave tops. So, we are faced with the decision whether to drive a sailboat directly into the waves, making it pound or slam, or to drive it into the waves at something more approximating a sailing angle, which is what the boat was designed to do, even while motoring.
In our modern, schedule driven, "how long till we get there" society, (particularly prevalent among holiday making charterers), the decision is often to drive the boat straight upwind, and to motor
, since that's what keeps a boat on schedule. The result is endless pounding or slamming and much criticism of the boat and its design. IF, however, we remember that we are in a sailboat, and we sail it, we take the waves at an angle the designer
calculated for, and neither monohull nor cat pounds or slams very much at all.
I think that cats get a worse rap because 1) many of those who skipper
them may have less experience and patience and 2) the upwind sailing angle of cats is further off the wind, which makes the course longer and less desired, even if it will be traveled at a greater speed and take not much more time.
Using the observations gleaned from having sailed 40 odd different monohull designs, from dinghies to ketches in the mid 50 foot range, and 10 different cats, from a Gemini
to a Gunboat, I think you can make just about any monohull pound and any cat slam. Or not. My boat of the past twelve years is a Leopard 45
, a design with a reputation for slamming. And if I motor
my sailboat as hard as I can, straight into waves, I can make her slam, and slam quite badly, with a much louder crash than we hear in the video. On the other hand, if I choose to sail my sailboat as she was designed to be sailed, I still get there in almost the same time, and she hardly ever slams, at all. If I motor, but head
off from dead upwind, the slamming eases off dramatically, as well. So, some of it's the boat, and some of it's the skipper
, no matter how many hulls and what type.
The OP asked us to choose between an Amel and an IP. I join those who, for the OP's purposes, suggest that he give some consideration to a cat, which seems to me to be the ideal solution and at least the equal of his two choices, although both of those are good ones. I have lived 19 years aboard a mono, and 11 on a cat, so I have some idea of what to expect on either. And, when it comes to really tough boats, very well designed for ease of maintenance
and ability to get at everything and every system, I have yet to see anything better than the early Leopards such as my 45.
Lagoons are known for being somewhat less rugged (not flimsy, though), and I have no idea what happened to the Lagoon
that almost broke up, mentioned in a previous post. But, to my knowledge, something like that has never happened to an older Leopard
(or a newer one, for that matter), and they have accumulated multiple millions of miles throughout all the oceans.