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Hirondelle Mk II Catamaran, 1977 Morgan, New Jersey. $10,925
LOA 22’-10” Beam 10’ Draft 18”/ 4’ Weight 2400 lbs (approx.) 1 dbl berth, 2 quarterberths
I did significant work on this rare classic English catamaran before bringing her up the ICW from Savannah to the Chesapeake Bay. There we meandered northward exploring coves and inlets that most boats could not enter. When we reached the top of the Bay we headed through the C&D Canal, down the Delaware Bay, and back inside from Cape May to Manasquan Inlet. There we headed outside up to and around Sandy Hook. I and my crew of 1-2 spent three comfortable months on our 1,000+ mile journey.
There is 5-8” of headroom in both hulls and sitting headroom in the bridgedeck salon (which converts into a double berth). A friend of mine (who is 6’-3”) owns a Tartan 3700. He thought the head in my boat was more comfortable than the one in his. He also liked the dual companionways which he thought prevented traffic jams.
2017 Tohatsu 9.8hp 4-cycle longshaft with electric start/tilt and alternator. Easy access in engine box.
Engine RPM/Hours Meter 5 gallon and 2.5 gallon gas tanks
675 CCA Duracell Group 31 Deep cycle battery (2017) Master Disconnect Switch (1970s?) Eight-Fuse Panel (1970s?) Shore Power inlet (not installed) Solar panel (1970s?) Wiring & mast-mounted antenna in place for a modern radio Raymarine 365 Fish/Depthfinder (age unknown) LED running lights (2017) LunaSea LED masthead light (2017) LED Interior lights (2017) Wind Indicators on both bow pulpits Two stainless steel Marinco Solar Plus 3” vents (2017)
Hulls barrier-coated with five coats of West epoxy and West 422 Barrier Coat Additive.
Roomy, enclosed head w/ Locker for sails and/or foul weather gear
Thetford PORTA Potti 550p MSD Portable Toilet plumbed so it can be emptied at any Pumpout station (2017)
Jibs: Drifter, Genoa, 120% working, 100% working, Storm sail (original)
Mainsail from S2 6.8 (slightly undersized). Still have the original main.
(4) 24” x 9” oval (no-roll) Attwood fenders (2017) Rocna 22 anchor with 30 feet chain and 200 ft rode (2017) Docklines
Additional Improvements (2017-2019)
Backing plates installed on forestay (2019) Backing and reinforcing plates installed on backstays (2019) All new running rigging with new captive shackles (2017) New Mainsheet line (2017) New jibsheet line (2017) Cam cleats with fairleads installed on rudder-lifting lines (2019) New High Beam traveler with Harken track, car, and traveler ends installed (2019) Barton Winchers installed (2019) Dual Bilge Pump Project (not complete) includes Rule bilge pumps, switches, alarms, hose, & thru-hulls Boarding ladder (2017) Opening Screen Door at starboard companionway (2017) Drideck in cockpit (2017) Acoustical foam for engine enclosure (not installed) New rudder cheeks built with Meranti plywood soaked in penetrating epoxy. All holes were drilled oversize, filled with epoxy, and redrilled. (2017) Lots of other photos. or phone (732) 539-1257
The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.
Classic hull speed formula:
Hull Speed = 1.34 x √LWL
A more accurate formula devised by Dave Gerr in The Propeller Handbook replaces the Speed/Length ratio constant of 1.34 with a calculation based on the Displacement/Length ratio.
Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio.311
Hull Speed = Max Speed/Length ratio x √LWL
A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.
SA/D = SA ÷ (D ÷ 64)2/3
A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.
Ballast / Displacement * 100
A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.
D/L = (D ÷ 2240) ÷ (0.01 x LWL)³
This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.
Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam1.33)
This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.
CSV = Beam ÷ ³√(D / 64)
The biggest difference between the Hirondelle Mk I and II was in the rig; being a little under a metre shorter.
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