SEDATION 4  Design Overview
by Larry McInerney


SEDATION 4 is my permanent floating home and R&D facility, thus her amenities include a lab/workshop, gourmet kitchen, alcohol- and espresso-bar, audiophile sound system and other "necessities" appreciated at the hacienda in Dallas.  At 6' 3½" tall, there were no appropriate production cruising catamarans available with sufficient headroom to prevent me from repeated head-bumps (heaven knows I've incurred enough already :) so a custom-built yacht was the only alternative. Accommodations include queen-size beds and large showers for both the master and guest staterooms. Both bathrooms have "home size" heads in private compartments with reading lights and flip-down laptop desks. Countertop heights are optimized for me based on ergonomic requirements for the respective activities.  

The Caribe DL-15 rigid-bottom inflatable tender (launch, dinghy, whatever) can safely transport 8 persons, or LOTS of cargo, quickly and safely.  Carrying such a large auxiliary vessel is unheard-of on catamarans even twice the size of SEDATION 4, however it seems pretty silly to see a 65' luxury cruising catamaran fitted with a 9' inflatable dinghy only capable of holding 25% of the yachts' occupants!  This catamaran's unusual flat-transom configuration facilitates storage and access to the dinghy via custom-designed davits and boarding platform. 

The full transom and tall deckhouse are, admittedly, about as aerodynamic as a pregnant water buffalo, but form-follows-function in this vessel's design so compromises must be made.  All these amenities are heavy ... VERY heavy ... so the vessel is fabricated using Nida-Core™ honeycomb composite construction which significantly reduces weight.
 


Most on-board systems, including refrigerators, ice maker and deep freeze, are 12 Volt DC.  Inverters satisfy the few 120 Volt AC requirements (printer, scanner, chargers, espresso machine, power tools, shop-vac etc.) therefore SEDATION 4 carries a formidable bank of deep-cycle marine batteries.  Each propulsion engine will have an independent starting battery which is maintained by the engine's dedicated charging circuit.  The generator will maintain a bank of 6 "house batteries" automatically, supplemented by both solar-panels and wind-generator(s).  If needed, a manually-operated paralleling system will enable switched "jump starting" of discharged batteries from other banks. Specified on-board systems are very energy-efficient resulting in negligible fuel usage to maintain the 12V supply.

The sailplan for SEDATION 4 is a "Hoyt Balanced Rig" (patent pending), conceived by the renowned Garry Hoyt, which is similar to an AeroRig® on a self-supporting mast.  This type of rig is optimum for single-handed cruising but imparts significantly greater loads to the hull and deckhouse.  Extensive reinforcement of the pilothouse roof and bridgedeck floor (underbelly) with additional stress-dispersal bulkheads is required.  Presently, an AeroRig® is about twice the price of a comparable masthead sail installation but the Hoyt Balanced Rig should cost less.  This will be the first ever  ... hey ... somebody has to be the guinea pig ;}

Air Conditioning is specified for the vessel if I ever desire it.  Hot water will be provided by heat exchangers on the generator plus electric elements. The 12V-to-110V inverters also works in reverse to supply 12V power and charge batteries when (if) plugged-in to shore power.  SEDATION 4 will not spend much time in-port so typical marina-based features like phone & cable TV hook-ups are NOT included.  E-mail, FAX, telephone and Internet services will be handled via Single Side Band (SSB) radio and satellite connection.  Most time will be spent on-the-hook (at anchor) with extensive use of the launch for exploring, visits ashore and provisioning runs.  Two fold-up bicycles will be carried to facilitate land activities; another reason for the large tender.