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These boats are a great family weekender design with full length sleeping berths for five adults, cooking area, sink and a separate head. Excellent use of space. This is the faster version with dagger boards. Her accommodations surpass any boat of her size, while retaining the functionality to be easily trailered and stored out of water. There is 6 of headroom in both hulls and sitting headroom in the bridge deck salon (which converts into a double berth). The dual companionways prevent traffic jams. It is a motor sailor with a light weight brand new Toshiba 20 HP, electric tilt and start, with dashboard steering (can be disconnected in a second for sailing).
She outperforms most monohulls and some multihulls on nearly all points of sail and points exceptionally well, due to her daggerboard design. I can match speed and pointing of a local, new, $1 million touring catamaran in all weather conditions. She is easy to solo sail with a logical layout for the running rigging. She has been kept on a trailer or lift not needing any bottom paint.
This Hirondelle is different and better than all the rest because I have upgraded the weakest points of the boat, completing high quality structural engineered upgrades such as: 1-High strength aluminum rudder pockets with the rudder pins upgraded to heavy duty refrigerator pins. 2-High strength aluminum rudders 3-High strength dagger boards made of Coosa board 4- Fiber glassed in place, backer plates for all of the above 5- All attachment points/holes have been moved up above the water line. 6-Custom bracket on mast for boom gin pole 7-2024 Tohmatsu 20hp 4-cycle long shaft, high thrust prop with electric start/tilt and alternator. Relocated to stern for more cockpit room.
Equipment: Additionally, you have the convenience of wheel steering while motoring or sailing. The captain’s seat is located in the center with everything at arms length to easily solo sail it. 1-Motor throttle located next to steering 2-Traveler Cam cleat is Hobie cat style for quick one hand adjustment 3-Can quickly convert from motoring to sailing by removing 1 pin
The exterior was redone professionally in 2022 at a cost of 11K, duplicating the original anti-skid areas with entire boat sanded, divots filled in, 3 heavy gel coats with sanding in between, and 3 paint coats (documented).
I am too busy with a disabled wife to complete the remaining tasks which are to paint the interior (paint included) and replace the plywood dashboard with Coosa board (included). She is ready to sail. Trailer included with recently changed bearings and tires.
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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