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post #111 of Old 02-24-2018
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Re: Multihull Popularity and Interesting Designs

What upsets me about this thread and many threads on this forum is how some neglect a basic reality that underpins most cruisers mentality when thinking about boats. This reality extends across all classes be it monos,multis or motor.

There are good seaboats and those not so much.

Comparisons between classes of boats is foolish if not also accounting for if that specific craft is a good or bad seaboat. Grand Banks are wonderful, beautiful, comfortable great loop or coastal cruisers. Sea rays give great bang for the buck. Neither are designed to be or are expedition yachts.
You can blow big bucks and get an light ice Diesel Duck 492 for less than the glorious GB but only the first is the rtw boat. You can quadruple the purchase price and walk on a Seaton or Cape Scott and get the bling with the sea keeping ability to sail the Southern ocean.
The same occurs with monos or multis.

Looking at the title of this thread believe we should be looking at specific boats and critiqueing that specific design. Multis have several vulnerabilities as do monos or motor. This obsession about inverting limits this thread to one of many concerns so is much less informative than it could be.
Look at the various cats you see in Caribbean charter. These are like the Searays. Even in that relatively benign setting one sees:
They hobby horse. When motoring to windward( such as entering an anchorage) this is so extreme as to be dangerous to the occupants. Their beam to length ratio is moderate but capsize risk decreased by moderate rigs. They aim toward one level living with large expanses of glass. But a violent pooping may result in failure of the aft glass enclosure or its rim of support leading to down flooding. The steering is designed for the stresses of forward movement. Falling backwards after being stalled on the face of a wave may result in catastrophic steering failure. Interior living space is optimized for pleasant living at anchor with bridge deck forward of the mast and beam of hulls brought forward to allow a four berth set up. Beyond unpleasant burping the behavior in a seaway is compromised. They have low aspect fixed keels. Beyond decreasing ability to point increased possibilities of “tripping” on a large wave face is increased. Helm position is high and exposed. This is tiring to the helmsman and compromises ability to see the whole boat.

Now compare this to a boat designed as a seaboat. Perhaps the Rapido 60referred to above.
Single rudder. No linkage issues. Very fine hulls and very wide beam with much more force required to turn turtle. No significant structure beyond central hull before the mast. Daggerboard no fixed keel. Protected helm station. Walkways and rig designed to be worked in a seaway. No large glass expanses vulnerable in a pooping or from green water.

In short just like a Diesel Duck would seem to be a better seaboat than a Searay the R60 would seem to be a better seaboat than the charter cat.

s/v Hippocampus
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